For Mexico

P0527 COOLING FAN SPEED SENSOR

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:


Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and warm it up to the normal operating temperature.
2.Keep the engine speed approximately 1,000 rpm at no load.
3.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-I

1.Turn ignition switch OFF.
2.Disconnect electrically-controlled cooling fan coupling harness connector.
3.Turn ignition switch ON.
4.Check the voltage between electrically-controlled cooling fan coupling harness connector terminals.





Is inspection result normal?
YES- GO TO 6.
NO- GO TO 2.

2. CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-II

1.Check the voltage between electrically-controlled cooling fan coupling harness connector and the ground.





Is inspection result normal?
YES- GO TO 4.
NO- GO TO 3.

3. CHECK SENSOR POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check harness connector for short to power and short to ground, between the following terminals.





Is inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit. For Mexico.
NO- Repair or replace error-detected parts.

4. CHECK COOLING FAN SPEED SENSOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between electrically-controlled cooling fan coupling harness connector and ECM harness connector.





Is inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

5. CHECK ECM GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between ECM harness connector and the ground.





Is inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Repair or replace error-detected parts.

6. CHECK COOLING FAN SPEED SENSOR SIGNAL CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between electrically-controlled cooling fan coupling harness connector and ECM harness connector.





4.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.

7. CHECK COOLING FAN SPEED SENSOR

1.Reconnect all harness connectors disconnected.
2.Perform cooling fan speed sensor component inspection. .
Is inspection result normal?
YES- GO TO 8.
NO- Replace electrically-controlled cooling fan coupling.

8. 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.

9. CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING SYSTEM

For Mexico.
Is inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Repair or replace error-detected parts.


Component Inspection (Cooling Fan Speed Sensor)


1. CHECK COOLING FAN SPEED SENSOR

1.Turn ignition switch OFF.
2.Disconnect electrically-controlled cooling fan coupling harness connector.
3.Rotate the electrically-controlled cooling fan coupling slowly with hand and check the voltage between electrically-controlled cooling fan coupling connector terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace Electrically-controlled cooling fan coupling.