DI–56
DIAGNOSTICS
–
ENGINE
DI1ED–07
DTC
P0135 Heated Oxygen Sensor Heater Circuit
Malfunction (Bank1 Sensor1)
DTC
P0141 Heated Oxygen Sensor Heated Circuit
Malfunction (Bank1 Sensor2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI–44.
DTC No.
DTCDetectingCondition
TroubleArea
When the heater operates, heater current exceeds 2 A
(2 trip detection logic)
S Open or short in heater circuit of heated oxygen sensor
P0135
P0141
S Heated oxygen sensor heater
Heater current of 0.2 A or less when the heater operates
(2 trip detection logic)
S ECM
HINT:
S
S
S
Bank 1 refers to the bank that includes cylinder No.1.
Sensor 1 refers to the sensor closer to the engine body.
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page DI–44 for the WIRING DIAGRAM.
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 warmed up or not, the air–fuel ratio lean or rich, etc.
at the time of the malfunction.
2000 CELICA (RM744U)
