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DI-1 15

DIAGNOSTICS ENGINE

DI2H9-03

DTC

P1135

A/F Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

DTC

P1155

A/F Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

CIRCUIT DESCRIPTION

Refer to DTC P0125 on page DI-43 .

DTC No. DTC Detecting Condition When the heater operates, heater current exceeds 8 A (2 trip detection logic) Heater current of 0.25 A or less when the heater operates (2 trip detection logic) Trouble Area S Open or short in heater circuit of A/F sensor S A/F sensor h t heater S ECM

P1135 P1155

WIRING DIAGRAM

Refer to DTC P0125 on page DI-43 .

INSPECTION PROCEDURE

HINT: Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

1

Check voltage between terminals HAFL, HAFR of ECM connector and body ground.

ON HAFL HAFR

(+)

(-)

A02032

PREPARATION: (a) Remove the glove compartment (See page SF-83 ). (b) Turn the ignition switch ON. CHECK: Measure the voltage between terminals HAFL, HAFR of the ECM connector and body ground. OK: Voltage: 9 - 14 V OK Check and replace ECM (See page IN-30 ).

NG

2

Check resistance of A/F sensor heater (See page SF-79 ).

2001 AVALON (RM808U)

Author :

Date :

271

DI-1 16

DIAGNOSTICS ENGINE

NG

Replace A/F sensor.

OK

3

Check A/F sensor heater relay (Marking: A/F) (See page SF-61 ).

NG

Replace A/F sensor heater relay.

OK

Check and repair harness or connector between A/F sensor heater relay and A/F sensor, and A/F sensor and ECM (See page IN-30 ).

2001 AVALON (RM808U)

Author :

Date :

272

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