DTC Diagnosis Procedure
- CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-I
- Turn ignition switch OFF.
- Disconnect the fan clutch assembly harness connector.
- Turn ignition switch ON.
- Check the voltage between the fan clutch assembly harness connector terminals.
Fan clutch assembly
Voltage
(Approx.)
Connector
+
-
terminal
F97
2
4
5 V
Is inspection result normal?
YES
GO TO 6.
NO
GO TO 2.
- CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-II
- Check the voltage between the fan clutch assembly harness connector and the ground.
+
-
Voltage
(Approx.)
Fan clutch assembly
Connector
terminal
F97
2
Ground
5 V
Is inspection result normal?
YES
GO TO 4.
NO
GO TO 3.
- Check the voltage between the fan clutch assembly harness connector and the ground.
- CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Perform Diagnosis Procedure .
Is inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit. Refer to DTC Diagnosis Procedure .
NO
Repair or replace error-detected parts.
- CHECK COOLING FAN SPEED SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between the fan clutch assembly harness connector and ECM harness connector.
+
-
Continuity
Fan clutch assembly
ECM
Connector
Terminal
Connector
Terminal
F97
4
F78
43
Existed
Is inspection result normal?
YES
GO TO 5.
NO
Repair or replace error-detected parts.
- CHECK ECM GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between ECM harness connector and the ground.
+
-
Continuity
ECM
Connector
Terminal
E77
147
Ground
Existed
149
152
Is inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
Repair or replace error-detected parts.
- CHECK COOLING FAN SPEED SENSOR SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between fan clutch assembly harness connector and ECM harness connector.
+
-
Continuity
Fan clutch assembly
ECM
Connector
Terminal
Connector
Terminal
F97
5
F78
31
Existed
- Also check harness for short to ground and to power.
Is inspection result normal?
YES
GO TO 7.
NO
Repair or replace error-detected parts.
- CHECK COOLING FAN SPEED SENSOR
- Reconnect all harness connectors disconnected.
- Perform cooling fan speed sensor component inspection. Refer to Component Inspection (Cooling Fan Speed Sensor) .
Is inspection result normal?
YES
GO TO 8.
NO
Replace the fan clutch assembly.
- CHECK COOLING FAN ROTATIONAL CONDITION
Rotate the cooling fan by hand.
Dose the cooling fan rotates smoothly?
YES
GO TO 9.
NO
Check that the cooling fan is not interfered with other parts.
- CHECK FAN CLUTCH ASSEMBLY CLUTCH ASSEMBLY SYSTEM
Refer to Diagnosis Procedure .
Is inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
Repair or replace error-detected parts.