Description

Refer to DTC P2195 (See page ES-304). HINT:

• When any 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 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 Heater Relay

A/F Heater Fuse

From Battery From EFI Relay o-o

EFI No.2 Fuse

A/F Sensor

HA1A

A1A+

A1A-

JTTLTL

Duty Control

DTC No.

DTC Detection Conditions

Trouble Areas

P0031 P0051

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

• Open in A/F sensor heater circuit

• A/F sensor heater relay

• ECM

DTC No.

DTC Detection Conditions

Trouble Areas

P0032 P0052

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

• Short in A/F sensor heater circuit

• A/F sensor heater relay

• Bank 1 refers to the bank that includes cylinder No. 1.

• Bank 2 refers to the bank that does not include cylinder No. 1.

• Sensor 1 refers to the sensor closest to the engine assembly.

• Sensor 2 refers to the sensor farthest away from the engine assembly.

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