Description

Refer to DTC P0136 (See page ES-128). 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 Bank 1 Sensor 2)

From Battery

HO2 Sensor

Ground

HO2 Sensor

From Battery

Ground

DTC No.

DTC Detection Conditions

Trouble Areas

P0037 P0057

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

• Open in HO2 sensor heater circuit

• HO2 sensor heater

• ECM

DTC No.

DTC Detection Conditions

Trouble Areas

P0038 P0058

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

• Short in HO2 sensor heater circuit

• HO2 sensor heater

• ECM

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