Description

Refer to DTC P0136 (see page ES-129). HINT:

• When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the Heated Oxygen (HO2) Sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned OFF.

• The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The HO2 sensor heater circuit uses a relay on the B+ side of the circuit.

Reference (System Diagram of Sensor 2):

HO2 Sensor

EFI MAIN

from Battery

EFI MAIN

Heater

HT1B

HT1B

Sensor

OX1B

OX1B

EX1B

MREL

A133556EG1

DTC No.

DTC Detection Conditions

Trouble Areas

PGG37

Heated Oxygen (HO2) sensor heater current less than 0.3 A (1 trip detection logic)

• Open in HO2 sensor heater circuit

• Integration relay (EFI MAIN relay)

• ECM

PGG38

Heated Oxygen (HO2) sensor heater current more than 2 A (1 trip detection logic)

• Short in HO2 sensor heater circuit

• Integration relay (EFI MAIN relay)

• ECM

PG141

Cumulative heater resistance correction value exceeds threshold

(2 trip detection logic)

• Open or short in HO2 sensor heater circuit

• Integration relay (EFI MAIN relay)

• ECM

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