Diagnosis Procedure
- CHECK EXHAUST GAS TEMPERATURE SENSOR
With CONSULT
- Turn ignition switch ON.
- Select "EXHAUST GAS TEMP SEN 1 B2" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
- Start engine and warm it up to normal operating temperature.
- Check that "EXHAUST GAS TEMP SEN 1 B2" indication as follows.
Monitor item
Condition
Value
EXHAUST GAS TEMP SEN 1 B2
- Warm-up condition
- Idle speed
1, 290 - 2, 940 mV
Without CONSULT
- Start engine and warm it up to normal operating temperature.
- Check that voltage between ECM harness connector terminals as follows.
ECM
Condition
Voltage
Connector
+
-
Terminal
F78
17
43
- Warm-up condition
- Idle speed
1.29 - 2.94 V
Is the inspection result normal?
YES
GO TO 2 .
NO
Replace exhaust gas temperature sensor. Refer to Exploded View .
- CHECK EXHAUST GAS TEMPERATURE SENSOR POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect exhaust gas temperature sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between exhaust gas temperature sensor harness connector terminal and ground.
+
-
Voltage
(Approx.)
Exhaust gas temperature sensor
Connector
Terminal
F89
1
Ground
5 V
Is the inspection result normal?
YES
GO TO 3 .
NO
GO TO 4 .
- CHECK EXHAUST GAS TEMPERATURE SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between exhaust gas temperature sensor harness connector and ECM harness connector.
+
-
Continuity
Exhaust gas temperature sensor
ECM
Connector
Terminal
Connector
Terminal
F89
2
F78
43
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
Repair or replace error-detected parts.
- CHECK EXHAUST GAS TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between exhaust gas temperature sensor harness connector and ECM harness connector.
+
-
Continuity
Exhaust gas temperature sensor
ECM
Connector
Terminal
Connector
Terminal
F89
1
F78
17
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .
NO
Repair or replace error-detected parts.