LAUNCH TOUCH PRO ELITE OBD2 Scanner Touch PRO Elite- 2023 User Manual

LAUNCH

TOUCH PRO ELITE User Manual

this publication may be reproduced, stored in a retrieval system, or transmitted in

any form or by any means, electronic, mechanical, photocopying and recording

or otherwise, without the prior written permission of LAUNCH. The information

contained herein is designed only for the use of this unit. LAUNCH is not

responsible for any use of this information as applied to other units.

Statement: LAUNCH owns the complete intellectual property rights for the software

used by this product. For any reverse engineering or cracking actions against the

software, LAUNCH will block the use of this product and reserve the right to pursue

their legal liabilies.

Trademark Information

LAUNCH is a registered trademark of LAUNCH TECH CO., LTD. (also called

LAUNCH for short) in China and other countries. All other LAUNCH trademarks,

service marks, domain names, logos, and company names referred to in this

manual are either trademarks, registered trademarks, service marks, domain

names, logos, company names of or are otherwise the property of LAUNCH or

its a󰀩liates. In countries where any of the LAUNCH trademarks, service marks,

domain names, logos and company names are not registered, LAUNCH claims

other rights associated with unregistered trademarks, service marks, domain

names, logos, and company names. Other products or company names referred

to in this manual may be trademarks of their respective owners. You may not use

any trademark, service mark, domain name, logo, or company name of LAUNCH

or any third party without permission from the owner of the applicable trademark,

service mark, domain name, logo, or company name. You may contact LAUNCH

by visiting the website at www.cnlaunch.com, or writing to LAUNCH TECH CO.,

LTD., Launch Industrial Park, North of Wuhe Avenue, Banxuegang, Bantian,

Longgang, Shenzhen, Guangdong, P.R.China, to request written permission to

use Materials on this manual for purposes or for all other questions relating to

this manual.

General Notice

• Other product names used herein are for identification purposes only and

may be trademarks of their respective owners. LAUNCH disclaims any and all

rights in those marks.

• There is a possibility that this unit is inapplicable to some of the vehicle

models or systems listed in the diagnosis section due to di󰀨erent countries,

areas, and/or years. Do not hesitate to contact LAUNCH if you come across

such questions. We are to help you solve the problem as soon as possible.

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TOUCH PRO ELITE User Manual

Disclaimer

• To take full advantage of the unit, you should be familiar with the engine.

• All information, illustrations, and specications contained in this manual are

based on the latest information available at the time of publication. The right

is reserved to make change at any time without notice.

• Neither LAUNCH nor its a󰀩liates shall be liable to the purchaser of this unit

or third parties for damages, losses, costs or expenses incurred by purchaser

or third parties as a result of: accident, misuse, or abuse of this unit, or

unauthorized modifications, repairs, or alterations to this unit, or failure to

strictly comply with LAUNCH operating and maintenance instructions.

• LAUNCH shall not be liable for any damages or problems arising from the

use of any options or any consumable products other than those designated

as Original LAUNCH Products or LAUNCH Approved Products by LAUNCH.

Safety Precautions and Warnings

To prevent personal injury or damage to vehicles and/or this tool, please read

this user’s manual rst carefully and observe the following safety precautions at

a minimum whenever working on a vehicle:

• Always perform automotive testing in a safe environment.

• Do not attempt to operate or observe the tool while driving a vehicle.

Operating or observing the tool will cause driver distraction and could cause a

fatal accident.

• Wear safety eye protection that meets ANSI standards.

• Keep clothing, hair, hands, tools, test equipment, etc. away from all moving or

hot engine parts.

• Operate the vehicle in a well-ventilated work area: Exhaust gases are

poisonous.

• Put blocks in front of the drive wheels and never leave the vehicle unattended

while running tests.

• Use extreme caution when working around the ignition coil, distributor cap,

ignition wires and spark plugs. These components create hazardous voltages

when the engine is running.

• Put the transmission in P (for A/T) or N (for M/T) and make sure the parking

brake is engaged.

• Keep a re extinguisher suitable for gasoline/chemical/ electrical res nearby.

• Don’t connect or disconnect any test equipment while the ignition is on or the

engine is running.

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TOUCH PRO ELITE User Manual

• Keep this tool dry, clean, free from oil/water or grease. Use a mild detergent

on a clean cloth to clean the outside of the tool, when necessary.

• Please use the 5 V DC power adaptor to charge this tool. No responsibility

can be assumed for any damage or loss caused as a result of using power

adaptors other than the right one.

FCC Statement:

Any Changes or modications not expressly approved by the party responsible for compliance

could void the user’s authority to operate the equipment.

This device complies with part 15 of the FCC Rules. Operation is subject to the following

two conditions: (1) This device may not cause harmful interference, and (2) this device must

accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a

Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed

to provide reasonable protection against harmful interference in a residential installation.

This equipment generates, uses, and can radiate radio frequency energy, and if not

installed and used in accordance with the instructions, may cause harmful interference

to radio communications. However, there is no guarantee that interference will not occur

in a particular installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment o and on, the user

is encouraged to try to correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the

receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

TOUCH PRO ELITE (FCC ID: XUJPROELITE) has been evaluated to meet general RF

exposure requirement. The highest reported SAR value is 0.58W/kg. This device was tested

for typical body-worn operations with the back of the handset kept 0mm from the body.

The use of accessories that do not satisfy these requirements may not comply with FCC RF

exposure requirements, and should be avoided.

Hereby, Launch Tech Co., Ltd. declares that this Professional Diagnostic Tool (Model TOUCH

PRO ELITE) is in compliance with the essential Requirements and other relevant provisions

of Radio Equipment Directive 2014/53/EU.

Operation frequency and Max. RF output power:

WiFi 802.11b/g/n(2.4G): 2412-2472MHz, 18.92dBm;

The RF frequencies can be used in Europe without restriction.

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TOUCH PRO ELITE User Manual

Table of Contents

1. Introduction ........................................................................................... 1

2. General Information .............................................................................. 3

2.1 On-Board Diagnostics (OBD) I ........................................................... 3

2.2 On-Board Diagnostics (OBD) II .......................................................... 3

2.3 Diagnostic Trouble Codes (DTCs) ...................................................... 5

2.4 Location of the Data Link Connector (DLC)........................................ 6

2.5 OBD II Terminology ............................................................................ 7

2.6 OBD II Monitors .................................................................................. 9

2.6.1 Continuous Monitors........................................................................ 9

2.6.2 Non-Continuous Monitors ................................................................ 10

2.6.3 OBD II Reference Table ................................................................... 14

2.7 DTCs and MIL Status ......................................................................... 15

3. Components and Controls .................................................................... 18

3.1 Controls .............................................................................................. 18

3.2 Technical Specications ..................................................................... 19

3.3 Accessory List..................................................................................... 20

4. Initial Use .............................................................................................. 21

4.1 Charging the Tool ............................................................................... 21

4.2 Getting Started ................................................................................... 21

5. Diagnose .............................................................................................. 25

5.1 Connection ......................................................................................... 25

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5.2 System Diagnosing............................................................................. 25

5.2.1 Smart Diagnosis (Auto-Detect) ........................................................ 25

5.2.2 Manual Diagnosis ............................................................................ 27

5.3 OBDII Diagnosis ................................................................................. 34

5.4 History ................................................................................................ 37

5.5 Resetting ............................................................................................ 39

6. Update .................................................................................................. 42

7. Data ...................................................................................................... 43

7.1 Diagnostic Report ............................................................................... 43

7.2 Diagnostic Record .............................................................................. 43

7.3 DTC Library ........................................................................................ 44

7.4 DLC(Data Link Connector) Location................................................... 45

7.5 Feedback ............................................................................................ 45

7.6 Firmware Fix ....................................................................................... 45

7.7 FAQ .................................................................................................... 45

7.8 Image.................................................................................................. 45

8. Settings................................................................................................. 46

8.1 Units of Measurement ........................................................................ 46

8.2 Screen Capture .................................................................................. 46

8.3 Automatic Detection on Connect ........................................................ 46

8.4 Display & Brightness .......................................................................... 46

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8.5 Sound ................................................................................................. 46

8.6 Network .............................................................................................. 46

8.7 Date/Time ........................................................................................... 47

8.8 Language............................................................................................ 47

8.9 Email Setup ........................................................................................ 47

8.10 Recovery .......................................................................................... 47

8.11 Clean up ........................................................................................... 47

8.12 About ................................................................................................ 47

9. FAQ ...................................................................................................... 48

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1. Introduction

TOUCH PRO ELITE Diagnostic Tool is an evolutionary smart solution for

passenger car diagnosis. It inherits LAUNCH’s advanced diagnosing technology

and is characterized by covering a wide range of vehicles and providing precise

test result and powerful functions.

It has the following functions and advantages:

• Smart (Auto-Detect) Diagnosis: Once the tool and the vehicle are properly

connected, the system starts auto-detect process. Once the whole process is

successfully nished, a diagnostic report will be automatically generated and

sent to your email box (if bound).

• Manual Diagnosis: If Auto-Detect failure occurs, manual diagnosis is also

available. Diagnosis functions include: Version Information, Read DTCs,

Clear DTCs and Read Data Stream (supports 3 display modes: Value, Graph

and Merged).

• OBDII Diagnosis: 10 modes of OBD II test are supported, including EVAP, O

Sensor, I/M Readiness, MIL Status, VIN Info, and On-board monitors testing

etc.

• Reset: Available maintenance and reset functions include Oil Lamp Reset,

Steering Angle Sensor (SAS) Reset, Electronic Parking Brake (EPB), Battery

Maintenance System (BMS) Reset, Diesel Particulate Filter (DPF), Electronic

Throttle Position Reset, ABS bleeding

• One-click Update: Let you update your diagnostic software and APK online.

• Diagnostic History: This function provides a quick access to the tested

vehicles and users can choose to view the test report or resume from the last

operation, without the necessity of starting from scratch.

• Diagnostic Feedback: Use this option to submit the vehicle issue to us for

analysis and troubleshooting.

• DTC Library: Allows you to retrieve the definition of the diagnostic trouble

code from the abundant DTC database.

• Displays battery real-time voltage once properly connected to the vehicle.

• Touch & Keypad input are supported.

This tool is specially designed to work with most OBD II compliant vehicles,

including Controller Area Network (CAN). It is required by EPA that all 1996 and

newer vehicles (cars and light trucks) sold in the United States must be OBD II

compliant and this includes all American, Asian and European vehicles.

A small number of 1994 and 1995 model year gasoline vehicles are OBD II

compliant. To verify if a 1994 or 1995 vehicle is OBD II compliant, check the

following:

Vehicle Emissions Control Information (VECI) Label

. It is located under the

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hood or by the radiator of most vehicles. If the vehicle is OBD II compliant,

the label will designate “OBD II Certied”.

2. Government regulations mandate that all OBD II compliant vehicles

must

have a “common” 16-pin

Data Link Connector (DLC)

Note: Some 1994 and 1995 vehicles have 16-pin connectors but are not

OBD II compliant. Only those vehicles with a Vehicle Emissions Control Label

stating “OBD II Certied” are OBD II compliant.

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2. General Information

2.1 On-Board Diagnostics (OBD) I

Note: With the exception of some 1994 and 1995 vehicles, most vehicles

from 1982 to 1995 are equipped with some type of rst generation On-Board

Diagnostics.

Beginning in 1988, California’s Air Resources Board (CARB), and later the

Environmental Protection Agency (EPA) required vehicle manufacturers to

include a self-diagnostic program in their on-board computers. The program

would be capable of identifying emissions-related faults in a system. The first

generation of Onboard Diagnostics came to be known as OBD I.

OBD I is a set of self-testing and diagnostic instructions programmed into the

vehicle’s onboard computer. The programs are specically designed to detect

failures in the sensors, actuators, switches and wiring of the various vehicle

emissions-related systems. If the computer detects a failure in any of these

components or systems, it lights an indicator on the dashboard to alert the driver.

The indicator lights only when an emissions-related problem is detected.

The computer also assigns a numeric code for each specific problem that it

detects, and stores these codes in its memory for later retrieval. These codes

can be retrieved from the computer’s memory with the use of a “Code Reader”

or a “Diagnostic Tool.”

2.2 On-Board Diagnostics (OBD) II

As technology evolved and the desire to improve the On-Board Diagnostic

system increased, a new generation of On-Board Diagnostic system was

developed. This second generation of On-Board Diagnostic regulations is called

“OBD II”.

In addition to performing all the functions of the OBD I System, the OBD II

System has been enhanced with new Diagnostic Programs. These programs

closely monitor the functions of various emissions-related components and

systems (as well as other systems) and make this information readily available

(with the proper equipment) to the technician for evaluation.

The California Air Resources Board (CARB) conducted studies on OBD I

equipped vehicles. The information that was gathered from these studies

showed the following:

• A large number of vehicles had deteriorating or degraded emissions-related

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components. These components were causing an increase in emissions.

• Because OBD I systems only detect failed components, the degraded

components were not setting codes.

• Some emissions problems related to degraded components only occur

when the vehicle is being driven under a load. The emission checks being

conducted at the time were not performed under simulated driving conditions.

As a result, a signicant number of vehicles with degraded components were

passing Emissions Tests.

• Codes, code definitions, diagnostic connectors, communication protocols

and emissions terminology were di󰀨erent for each manufacturer. This caused

confusion for the technicians working on di󰀨erent make and model vehicles.

To address the problems made evident by this study, CARB and the EPA passed

new laws and standardization requirements. These laws required that vehicle

manufacturers to equip their new vehicles with devices capable of meeting

all of the new emissions standards and regulations. It was also decided that

an enhanced on-board diagnostic system, capable of addressing all of these

problems, was needed. This new system is known as “On-Board Diagnostics

Generation Two (OBD II).” The primary objective of the OBD II system is to

comply with the latest regulations and emissions standards established by CARB

and the EPA.

The Main Objectives of the OBD II System are:

• To detect degraded and/or failed emissions-related components or systems

that could cause tailpipe emissions to exceed by 1.5 times the Federal Test

Procedure (FTP) standard.

• To expand emissions-related system monitoring. This includes a set of

computer run diagnostics called Monitors. Monitors perform diagnostics and

testing to verify that all emissions-related components and/or systems are

operating correctly and within the manufacturer’s specications.

• To use a standardized Diagnostic Link Connector (DLC) in all vehicles.

(Before OBD II, DLCs were of di󰀨erent shapes and sizes.)

• To standardize the code numbers, code definitions and language used to

describe faults. (Before OBD II, each vehicle manufacturer used their own

code numbers, code denitions and language to describe the same faults.)

• To expand the operation of the Malfunction Indicator Lamp (MIL).

• To standardize communication procedures and protocols between the

diagnostic equipment (Diagnostic Tools, Code Readers, etc.) and the

vehicle’s on-board computer.

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2.3 Diagnostic Trouble Codes (DTCs)

OBD II Diagnostic Trouble Codes are codes that are stored by the on-board

computer diagnostic system in response to a problem found in the vehicle. These

codes identify a particular problem area and are intended to provide you with a

guide as to where a fault might be occurring within a vehicle.

DO NOT

replace

parts based only on DTCs without rst consulting the vehicle’s service manual

for proper testing procedures for that particular system, circuit or component.

OBD II Diagnostic Trouble Codes consist of a ve-digit alphanumeric code.

• The 1st character is a

letter

(B, C, P or U). It identifies the “main system”

where the fault occurred (Body, Chassis, Powertrain, or Network).

• The 2nd character is a

numeric digit

(0 thru 3). It identies the “type” of code

(Generic or Manufacturer-Specic).

Note: Generic DTCs are codes that are used by all vehicle

manufacturers. The standards for generic DTCs, as well as their

denitions, are set by the Society of Automotive Engineers (SAE).

Manufacturer-Specific DTCs are codes that are controlled by the

vehicle manufacturers. The Federal Government does not require

vehicle manufacturers to go beyond the standardized generic DTCs in

order to comply with the new OBD II emissions standards. However,

manufacturers are free to expand beyond the standardized codes to make

their systems easier to diagnose.

• The 3rd character is a letter or a

numeric digit

(0 thru 9, A thru F). It identies

the specic system or sub-system where the problem is located.

• The 4th and 5th characters are

letters

numeric digits

(0 thru 9, A thru F).

They identify the section of the system that is malfunctioning.

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P0201 - Injector circuit malfunction, Cylinder 1

2.4 Location of the Data Link Connector (DLC)

The DLC (Data Link Connector or Diagnostic Link Connector) is typically a 16-

pin connector where diagnostic code readers interface with the vehicle’s on-

board computer. The DLC is usually located 12 inches from the center of the

instrument panel (dash), under or around the driver’s side for most vehicles. If

Data Link Connector is not located under dashboard, a label should be there

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telling location. For some Asian and European vehicles, the DLC is located

behind the ashtray and the ashtray must be removed to access the connector. If

the DLC cannot be found, refer to the vehicle’s service manual for the location.

Potential DLC Location

2.5 OBD II Terminology

The following terms and their denitions are related to OBD II systems. Read

and reference this list as needed to aid in the understanding of OBD II systems.

Powertrain Control Module (PCM)

-- The PCM is the OBD II accepted term

for the vehicle’s “on-board computer.” In addition to controlling the engine

management and emissions systems, the PCM also participates in controlling

the powertrain (transmission) operation. Most PCMs also have the ability to

communicate with other computers on the vehicle (ABS, ride control, body, etc.).

Monitors

-- Monitors are “diagnostic routines” programmed into the PCM. The

PCM utilizes these programs to run diagnostic tests, and to monitor operation

of the vehicle’s emissions-related components or systems to ensure they

are operating correctly and within the vehicle’s manufacturer specifications.

Currently, up to fteen Monitors are used in OBD II systems. Additional Monitors

will be added as the OBD II system is further developed.

Note: Not all vehicles support all fteen Monitors.

Enabling Criteria

-- Also termed Enabling Conditions. They are the vehicle-

specic events or conditions that must occur within the engine before the various

monitors will set, or run. Some monitors require the vehicle to follow a prescribed

“drive cycle” routine as part of the enabling criteria. Drive cycles vary among

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vehicles and for each monitor in any particular vehicle. Please refer to the

vehicle’s factory service manual for specic enabling procedures.

Trip

- A Trip for a particular Monitor requires that the vehicle is being driven in

such a way that all the required “Enabling Criteria” for the Monitor to run and

complete its diagnostic testing are met. The “Trip Drive Cycle” for a particular

Monitor begins when the ignition key is turned “On.” It is successfully completed

when all the “Enabling Criteria” for the Monitor to run and complete its diagnostic

testing are met by the time the ignition key is turned “Off.” Since each of the

fifteen monitors is designed to run diagnostics and testing on a different part

of the engine or emissions system, the “Trip Drive Cycle” needed for each

individual Monitor to run and complete varies.

OBD II Drive Cycle

-- A specific mode of vehicle operation that provides

conditions required to set all the readiness monitors applicable to the vehicle to

the “ready” condition. The purpose of completing an OBD II drive cycle is to force

the vehicle to run its onboard diagnostics. Some form of a drive cycle needs to

be performed after DTCs have been erased from the PCM’s memory or after

the battery has been disconnected. Running through a vehicle’s complete drive

cycle will “set” the readiness monitors so that future faults can be detected. Drive

cycles vary depending on the vehicle and the monitor that needs to be reset. For

vehicle specic drive cycle, consult the service manual.

Note: Do not confuse a “Trip” Drive Cycle with an OBD II Drive Cycle. A

“Trip” Drive Cycle provides the “Enabling Criteria” for one specic Monitor to

run and complete its diagnostic testing. An OBD II Drive Cycle must meet the

“Enabling Criteria” for all Monitors on a particular vehicle to run and complete

their diagnostic testing.

Warm-up Cycle

- Vehicle operation after an engine off period where engine

temperature rises at least 40°F (22°C) from its temperature before starting, and

reaches at least 160°F (70°C). The PCM uses warm-up cycles as a counter to

automatically erase a specic code and related data from its memory. When no

faults related to the original problem are detected within a specied number of

warm-up cycles, the code is erased automatically.

Fuel Trim (FT)

- Feedback adjustments to the base fuel schedule. Short-term

fuel trim refers to dynamic or instantaneous adjustments. Long-term fuel trim

refers to much more gradual adjustments to the fuel calibration schedule than

short-term trim adjustments. These long-term adjustments compensate for

vehicle di󰀨erences and gradual changes that occur over time.

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2.6 OBD II Monitors

An important part of a vehicle’s OBD II system is the Readiness Monitors, which

are indicators used to find out if all of the emissions components have been

evaluated by the OBD II system. They are running periodic tests on specific

systems and components to ensure that they are performing within allowable

limits.

Monitor operation is either “Continuous” or “Non-Continuous,” depending on the

specic monitor.

2.6.1 Continuous Monitors

Some of the vehicle components or systems are continuously tested by the

vehicle’s OBD II system, while others are tested only under specific vehicle

operating conditions. The continuously monitored components listed below are

always ready:

1. Misre Monitor

This Monitor continuously checks for engine misres. A misre occurs when the

air-fuel mixture in the cylinder does not ignite. The misre Monitor uses changes

in crankshaft speed to sense an engine misre. When a cylinder misres, it no

longer contributes to the speed of the engine, and engine speed decreases each

time the a󰀨ected cylinder(s) misre. The misre Monitor is designed to sense

engine speed fluctuations and determine from which cylinder(s) the misfire is

coming, as well as how bad the misre is.

There are three types of engine misres, Types 1, 2, and 3.

• Type 1 and Type 3 misfires are two-trip monitor faults. If a fault is sensed

on the rst trip, the computer temporarily saves the fault in its memory as a

Pending Code. The MIL is not commanded on at this time. If the fault is found

again on the second trip, under similar conditions of engine speed, load and

temperature, the computer commands the MIL “On,” and the code is saved in

its long term memory.

• Type 2 misres are the most severe type of misre. When a Type 2 misre

is sensed on the rst trip, the computer commands the MIL to light when the

misre is sensed. If the computer determines that a Type 2 misre is severe,

and may cause catalytic converter damage, it commands the MIL to “ash”

once per second as soon as the misfire is sensed. When the misfire is no

longer present, the MIL reverts to steady “On” condition.

The Misfire Monitor is supported by both “spark ignition” vehicles and

“compression ignition” vehicles.

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2. Fuel System Monitor

This Monitor uses a Fuel System Correction program, called Fuel Trim, inside

the on-board computer. Fuel Trim is a set of positive and negative values that

represent adding or subtracting fuel from the engine. This program is used

to correct for a lean (too much air/not enough fuel) or rich (too much fuel/not

enough air) air-fuel mixture. The program is designed to add or subtract fuel,

as needed, up to a certain percent. If the correction needed is too large and

exceeds the time and percent allowed by the program, a fault is indicated by the

computer.

The Fuel System Monitor is supported by both “spark ignition” vehicles and

“compression ignition” vehicles. The Fuel System Monitor may be a “One-Trip”

or “Two-Trip” Monitor, depending on the severity of the problem.

3. Comprehensive Components Monitor (CCM)

This Monitor continuously checks all inputs and outputs from sensors, actuators,

switches and other devices that provide a signal to the computer. The Monitor

checks for shorts, opens, out of range value, functionality and “rationality* (

See

Note

).”

Rationality: Each input signal is compared against all other inputs and

against information in the computer’s memory to see if it makes sense under

the current operating conditions.

Example: The signal from the throttle position sensor indicates the vehicle is

in a wide-open throttle condition, but the vehicle is really at idle, and the idle

condition is confirmed by the signals from all other sensors. Based on the

input data, the computer determines that the signal from the throttle position

sensor is not rational (does not make sense when compared to the other

inputs). In this case, the signal would fail the rationality test.

The CCM is supported by both “spark ignition” vehicles and “compression

ignition” vehicles. The CCM may be either a “One-Trip” or a “Two-Trip” Monitor,

depending on the component.

2.6.2 Non-Continuous Monitors

“Non-continuous” Monitors perform and complete their testing once per trip. The

“non-continuous” Monitors are:

1. O

Sensor Monitor

The Oxygen Sensor monitors how much oxygen is in the vehicle’s exhaust. It

generates a varying voltage of up to one volt, based on how much oxygen is in

the exhaust gas, and sends the signal to the computer. The computer uses this

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signal to make corrections to the air/fuel mixture. If the exhaust gas has a large

amount of oxygen (a lean air/fuel mixture), the oxygen sensor generates a “low”

voltage signal. If the exhaust gas has very little oxygen (a rich mixture condition),

the oxygen sensor generates a “high” voltage signal. A 450mV signal indicates

the most e󰀩cient, and least polluting, air/fuel ratio of 14.7 parts of air to one part

of fuel.

The oxygen sensor must reach a temperature of at least 600-650°F, and the

engine must reach normal operating temperature, for the computer to enter into

closed-loop operation.

The oxygen sensor only functions when the computer is in closed-loop. A

properly operating oxygen sensor reacts quickly to any change in oxygen content

in the exhaust stream. A faulty oxygen sensor reacts slowly, or its voltage signal

is weak or missing.

The Oxygen Sensor Monitor is supported by “spark ignition” vehicles only. The

Oxygen Sensor Monitor is a “Two-Trip” monitor. If a fault is found on the rst trip,

the computer temporarily saves the fault in its memory as a Pending Code. The

computer does not command the MIL on at this time. If the fault is sensed again

on the second trip, the computer commands the MIL “On,” and saves the code in

its long-term memory.

2. O

Sensor Heater Monitor

The Oxygen Sensor Heater Monitor tests the operation of the oxygen sensor’s

heater. There are two modes of operation on a computer-controlled vehicle:

“open-loop” and “closed-loop.” The vehicle operates in open-loop when the

engine is cold, before it reaches normal operating temperature. The vehicle

also goes to open-loop mode at other times, such as heavy load and full throttle

conditions. When the vehicle is running in open-loop, the oxygen sensor signal is

ignored by the computer for air/fuel mixture corrections. Engine e󰀩ciency during

open-loop operation is very low, and results in the production of more vehicle

emissions.

Closed-loop operation is the best condition for both vehicle emissions and

vehicle operation. When the vehicle is operating in closed-loop, the computer

uses the oxygen sensor signal for air/fuel mixture corrections.

In order for the computer to enter closed-loop operation, the oxygen sensor

must reach a temperature of at least 600°F. The oxygen sensor heater helps the

oxygen sensor reach and maintain its minimum operating temperature (600°F)

more quickly, to bring the vehicle into closed-loop operation as soon as possible.

The Oxygen Sensor Heater Monitor is supported by “spark ignition” vehicles

only. The Oxygen Sensor Heater Monitor is a “Two-Trip” Monitor. If a fault is

found on the rst trip, the computer temporarily saves the fault in its memory as

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a Pending Code. The computer does not command the MIL on at this time. If the

fault is sensed again on the second trip, the computer commands the MIL “On,”

and saves the code in its long-term memory.

3. Catalyst Monitor

The catalytic converter is a device that is installed downstream of the exhaust

manifold. It helps to oxidize (burn) the unburned fuel (hydrocarbons) and

partially burned fuel (carbon monoxide) left over from the combustion process.

To accomplish this, heat and catalyst materials inside the converter react with

the exhaust gases to burn the remaining fuel. Some materials inside the catalytic

converter also have the ability to store oxygen, and release it as needed to

oxidize hydrocarbons and carbon monoxide. In the process, it reduces vehicle

emissions by converting the polluting gases into carbon dioxide and water.

The computer checks the e󰀩ciency of the catalytic converter by monitoring the

oxygen sensors used by the system. One sensor is located before (upstream

of) the converter; the other is located after (downstream of) the converter. If the

catalytic converter loses its ability to store oxygen, the downstream sensor signal

voltage becomes almost the same as the upstream sensor signal. In this case,

the monitor fails the test.

The Catalyst Monitor is supported by “spark ignition” vehicles only. The Catalyst

Monitor is a “Two-Trip” Monitor. If a fault is found on the rst trip, the computer

temporarily saves the fault in its memory as a Pending Code. The computer does

not command the MIL on at this time. If the fault is sensed again on the second

trip, the computer commands the MIL “On” and saves the code in its long-term

memory.

4. Heated Catalyst Monitor

Operation of the “heated” catalytic converter is similar to the catalytic converter.

The main di󰀨erence is that a heater is added to bring the catalytic converter to

its operating temperature more quickly. This helps reduce emissions by reducing

the converter’s down time when the engine is cold. The Heated Catalyst Monitor

performs the same diagnostic tests as the catalyst Monitor, and also tests the

catalytic converter’s heater for proper operation.

The Heated Catalyst Monitor is supported by “spark ignition” vehicles only. This

Monitor is also a “Two-Trip” Monitor.

5. EGR (Exhaust Gas Recirculation) System Monitor

The Exhaust Gas Recirculation (EGR) system helps reduce the formation

of Oxides of Nitrogen during combustion. Temperatures above 2500°F

cause nitrogen and oxygen to combine and form Oxides of Nitrogen in the

combustion chamber. To reduce the formation of Oxides of Nitrogen, combustion

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temperatures must be kept below 2500°F. The EGR system recirculates small

amounts of exhaust gas back into the intake manifold, where it is mixed with the

incoming air/fuel mixture. This reduces combustion temperatures by up to 500°F.

The computer determines when, for how long, and how much exhaust gas is

recirculated back to the intake manifold. The EGR Monitor performs EGR system

function tests at preset times during vehicle operation.

The EGR Monitor is supported by both “spark ignition” vehicles and “compression

ignition” vehicles. The EGR Monitor is a “Two-Trip” Monitor. If a fault is found on

the rst trip, the computer temporarily saves the fault in its memory as a Pending

Code. The computer does not command the MIL on at this time. If the fault is

sensed again on the second trip, the computer commands the MIL “On,” and

saves the code in its long-term memory.

6. EVAP System Monitor

OBD II vehicles are equipped with a fuel Evaporative system (EVAP) that helps

prevent fuel vapors from evaporating into the air. The EVAP system carries

fumes from the fuel tank to the engine where they are burned during combustion.

The EVAP system may consist of a charcoal canister, fuel tank cap, purge

solenoid, vent solenoid, ow monitor, leak detector and connecting tubes, lines

and hoses.

Fumes are carried from the fuel tank to the charcoal canister by hoses or tubes.

The fumes are stored in the charcoal canister. The computer controls the ow of

fuel vapors from the charcoal canister to the engine via a purge solenoid. The

computer energizes or deenergizes the purge solenoid (depending on solenoid

design). The purge solenoid opens a valve to allow engine vacuum to draw the

fuel vapors from the canister into the engine where the vapors are burned. The

EVAP Monitor checks for proper fuel vapor ow to the engine, and pressurizes

the system to test for leaks. The computer runs this Monitor once per trip.

The EVAP Monitor is supported by “spark ignition” vehicles only. The EVAP

Monitor is a “Two-Trip” Monitor. If a fault is found on the rst trip, the computer

temporarily saves the fault in its memory as a Pending Code. The computer

does not command the MIL on at this time. If the fault is sensed again on the

second trip, the PCM commands the MIL “On,” and saves the code in its long-

term memory.

7. Secondary Air System Monitor

When a cold engine is first started, it runs in open-loop mode. During open-

loop operation, the engine usually runs rich. A vehicle running rich wastes

fuel and creates increased emissions, such as carbon monoxide and some

hydrocarbons. A Secondary Air System injects air into the exhaust stream to aid

catalytic converter operation:

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• It supplies the catalytic converter with the oxygen it needs to oxidize the

carbon monoxide and hydrocarbons left over from the combustion process

during engine warmup.

• The extra oxygen injected into the exhaust stream also helps the catalytic

converter reach operating temperature more quickly during warm-up periods.

The catalytic converter must heat to operating temperature to work properly.

The Secondary Air System Monitor checks for component integrity and system

operation, and tests for faults in the system. The computer runs this Monitor

once per trip.

The Secondary Air System Monitor is a “Two-Trip” monitor. If a fault is found

on the first trip, the computer temporarily saves this fault in its memory as a

Pending Code. The computer does not command the MIL on at this time. If the

fault is sensed again on the second trip, the computer commands the MIL “On,”

and saves the code in its long-term memory.

Note: The following Monitors became standard beginning in 2010. The

majority of vehicles produced before this time will not support these Monitors.

2.6.3 OBD II Reference Table

The table below lists current OBD II Monitors, and indicates the following for

each Monitor:

A. Monitor Type (how often does the Monitor run; Continuous or Once per trip).

B. Number of trips needed, with a fault present, to set a pending DTC.

C. Number of consecutive trips needed, with a fault present, to command the

MIL “On” and store a DTC.

D. Number of trips needed, with no faults present, to erase a Pending DTC.

E. Number and type of trips or drive cycles needed, with no faults present, to

turn o󰀨 the MIL.

F. Number of warm-up periods needed to erase the DTC from the computer’s

memory after the MIL is turned o󰀨.

Name of

Monitor

A B C D E F

CCM Continuous 1 2 1 3 40

Misre Monitor

(Type 1 and 3)

Continuous 1 2 1

3 - similar

conditions

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Misre Monitor

(Type 2)

Continuous 1 1 1

3 - similar

conditions

Fuel System

Monitor

Continuous 1 1 or 2 1

3 - similar

conditions

Catalytic

Converter

Monitor