X-TRAIL User Manual

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EC-138

[QR (WITH EURO-OBD)]

DTC P0031, P0032 HO2S1 HEATER

DTC P0031, P0032 HO2S1 HEATER PFP:22690

Description EBS010ML

SYSTEM DESCRIPTION

The ECM performs ON/OFF duty control of the heated oxygen sensor 1 heater corresponding to the engine

speed and engine coolant temperature. The duty percent varies with engine coolant temperature when engine

is started.

OPERATION

CONSULT-II Reference Value in Data Monitor Mode EBS010MM

Specification data are reference values.

On Board Diagnosis Logic EBS010MN

DTC Confirmation Procedure EBS010MO

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at

idle.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

Sensor Input Signal to ECM ECM function Actuator

Camshaft position sensor (PHASE)

Crankshaft position sensor (POS)

Engine speed

Heated oxygen sensor 1

heater control

Heated oxygen sensor 1

heater

Engine coolant temperature sensor Engine coolant temperature

Engine speed rpm Heated oxygen sensor 1 heater

Above 3,600 OFF

Below 3,600 ON

MONITOR ITEM CONDITION SPECIFICATION

HO2S1 HTR (B1)

● Engine: After warming up

● Engine speed: Below 3,600 rpm

● Engine speed: Above 3,600 rpm OFF

DTC No.

Trouble diagnosis

name

DTC detecting condition Possible cause

P0031

0031

Heated oxygen

sensor 1 heater

control circuit low

The current amperage in the heated oxygen

sensor 1 heater circuit is out of the normal

range.

(An excessively low voltage signal is sent to

ECM through the heated oxygen sensor 1

heater.)

● Harness or connectors

(The heated oxygen sensor 1 heater circuit is

open or shorted.)

● Heater oxygen sensor 1 heater

P0032

0032