Diagnosis Procedure
- CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-I
- Turn ignition switch OFF.
- Disconnect electrically-controlled cooling fan coupling harness connector.
- Turn ignition switch ON.
- Check the voltage between electrically-controlled cooling fan coupling harness connector terminals.VOLTAGE SPECIFICATION
Electrically-controlled cooling fan coupling Voltage (Approx.) Connector + - terminal F39 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 electrically-controlled cooling fan coupling harness connector and the ground.VOLTAGE SPECIFICATION
+ - Voltage (Approx.) Electrically-controlled cooling fan coupling Connector terminal F39 2 Ground 5 V Is inspection result normal?
YES: GO TO 4.
NO: GO TO 3.
- Check the voltage between electrically-controlled cooling fan coupling harness connector and the ground.
- CHECK SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check harness connector for short to power and short to ground, between the following terminals.TERMINALS REFERENCE
ECM Sensor Connector Terminal Name Connector Terminal F111 27 Low fuel pressure sensor F25 3 Power steering pressure sensor F35 1 Cooling fan speed sensor F39 2 28 FRP sensor F26 1 Is inspection result normal?
YES: Perform the trouble diagnosis for power supply circuit. Refer to "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 electrically-controlled cooling fan coupling harness connector and ECM harness connector.CONTINUITY SPECIFICATION
+ - Continuity Electrically-controlled cooling fan coupling ECM Connector Terminal Connector Terminal F39 4 F111 45 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 SPECIFICATION
+ - Continuity ECM Connector Terminal F111 10 Ground Existed E80 174 175 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 electrically-controlled cooling fan coupling harness connector and ECM harness connector.CONTINUITY SPECIFICATION
+ - Continuity Electrically-controlled cooling fan coupling ECM Connector Terminal Connector Terminal F39 5 F111 37 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 electrically-controlled cooling fan coupling.
- 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 ELECTRICALLY-CONTROLLED COOLING FAN COUPLING SYSTEM
Refer to "DIAGNOSIS PROCEDURE ".
Is inspection result normal?
YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".
NO: Repair or replace error-detected parts.