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TROUBLE DIAGNOSIS
EC-903
[YD (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Description for Work Flow
DIAGNOSTIC WORK SHEET
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one shown below in order to
organize all the information for troubleshooting.
STEP DESCRIPTION
STEP I
Get detailed information about the conditions and the environment when the incident/symptom occurred using the
EC-903, "
DIAGNOSTIC WORK SHEET" .
STEP II
Before confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st/2nd trip) DTC and
the freeze frame data (When 1st/2nd trip DTC is detected, Freeze Frame Data is not recorded.), then erase the DTC
and the data. (Refer to EC-895
.) The (1st/2nd trip) DTC and the freeze frame data can be used when duplicating the
incident at STEP III & IV.
If the incident cannot be verified, perform EC-936, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
Study the relationship between the cause, specified by (1st/2nd trip) DTC, and the symptom described by the cus-
tomer. (The Symptom Matrix Chart will be useful. See EC-909
.)
Also check related service bulletins for information.
STEP III
Try to confirm the symptom and under what conditions the incident occurs.
The DIAGNOSTIC WORK SHEET and the freeze frame data are useful to verify the incident. Connect CONSULT-II
to the vehicle in “DATA MONITOR (AUTO TRIG)” mode and check real time diagnosis results.
If the incident cannot be verified, perform EC-936, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IV
Try to detect the (1st/2nd trip) DTC by driving in (or performing) the DTC Confirmation Procedure. Check and read
the (1st/2nd trip) DTC and freeze frame data by using CONSULT-II or GST.
During the (1st/2nd trip) DTC verification, be sure to connect CONSULT-II to the vehicle in “DATA MONITOR (AUTO
TRIG)” mode and check real time diagnosis results.
If the incident cannot be verified, perform EC-936, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
In case the DTC Confirmation Procedure is not available, perform the Overall Function Check instead. The (1st/2nd
trip) DTC cannot be displayed by this check, however, this simplified check is an effective alternative.
The NG result of the Overall Function Check is the same as the (1st/2nd trip) DTC detection.
STEP V
Take the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX.
If the normal code is indicated, proceed to the BASIC INSPECTION. (Refer to EC-905
.)Then perform inspections
according to the Symptom Matrix Chart. (Refer to EC-909
.)
STEP VI
Identify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the
system for mechanical binding, loose connectors or wiring damage using (tracing) Harness Layouts.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR
(AUTO TRIG)” mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT-II.
Refer to EC-919
, EC-933 .
The Diagnostic Procedure in EC section contains a description based on open circuit inspection. A short circuit
inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in
GI-23, "
How to Perform Efficient Diagnosis for an Electrical Incident" .
Repair or replace the malfunction parts.
If malfunctioning part cannot be detected, perform EC-936, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT" .
STEP VII
Once you have repaired the circuit or replaced a component, you need to run the engine in the same conditions and
circumstances which resulted in the customer's initial complaint.
Perform the DTC Confirmation Procedure and confirm the normal code [DTC No. P0000] is detected. If the incident is
still detected in the final check, perform STEP VI by using a method different from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) (1st/2nd trip) DTC in
ECM. (Refer to EC-895, "
HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .)
SEF907L
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