Description

Refer to DTC P2195 (see page ES-292). HINT:

• When either of these DTCs is set, the ECM enters fail-safe mode. The ECM turns off the A/F 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 A/F sensor heater circuit uses a relay on the B+ side of the circuit.

Reference (System Diagram of Sensor 1):

From Battery

EFI MAIN

Ground

A/F Sensor

EFI MAIN

Heater

HA1A

HA1A

A1A-

Sensor

A1A+

A1A+

A1A-

MREL

Duty Control

A127244E01

DTC No.

DTC Detection Conditions

Trouble Areas

P0031

Air-Fuel Ratio (A/F) sensor heater current less than 0.8 A (1 trip detection logic)

• Open in A/F sensor heater circuit

• Integration relay (EFI MAIN relay)

• ECM

P0032

Air-Fuel Ratio (A/F) sensor heater current more than 10 A (1 trip detection logic)

• Short in A/F sensor heater circuit

• Integration relay (EFI MAIN relay)

• ECM

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