Description

Refer to DTC P2195 (See page ES-312). HINT:

• When either of these DTCs are 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 to 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 (Bank 1 Sensor 1 System Diagram)

A/F Sensor

A/F HEATER

From Battery

A/F HEATER

Heater

HA1A

A1A-

A1A+

From EFI Relay

HA1A

A1A+

A1A-

A1A+

jttltl

Duty Control jttltl

Duty Control

A118002E04

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

• 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

• ECM

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