Pinpoint Test A: Cooling Fan Tests

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A1: CHECK FOR COOLING FAN RELATED DTCS
1. Using the manufacturer approved diagnostic system, check the powertrain control module for the following cooling fan related DTCs (with any third byte):
- P0480 Fan 1 Control Circuit
- P0481 Fan 2 Control Circuit
- P0483 Fan Rationality Check
Are any cooling fan related DTCs set in the powertrain control module?
- Yes
  Refer to the powertrain control module DTC index and perform the relevant corrective action. GO to A9.
- No
  GO to A2.
A2: CHECK FOR OTHER DTCS
1. Using the manufacturer approved diagnostic system check the powertrain control module for DTCs
Are any other DTCs set in the powertrain control module?
- Yes
  Refer to the powertrain control module DTC index and perform the relevant corrective action
- No
  GO to A3.
A3: COOLING FAN IS OPERATING PERMANENTLY
1. Check the operation of the cooling fan
Is the cooling fan operating permanently at maximum speed?
- Yes
  GO to A5.
- No
  GO to A4.
A4: COOLING FAN IS NOT OPERATING
1. Check the operation of the cooling fan
Is the cooling fan inoperative?
- Yes
  GO to A6.
- No
  No fault found. Verify customer concern of cooling fan operation
A5: COOLING FAN IS OPERATING PERMANENTLY
Moving parts can cause severe injury, keep clear of moving parts, never place your hands or any part of your body near to moving parts.
1. Using the manufacturer approved diagnostic system, check datalogger signal - Electric Fan PWM Control Commanded (0x03F9)
Is the datalogger signal value between 5% and 16% whilst the cooling fan is operating?
- Yes
  GO to A8.
- No
  GO to A6.
A6: COOLING FAN IS NOT OPERATING
CAUTION: Ensure hood is closed and there are not any loose objects in front of the vehicle.
1. Using the manufacturer approved diagnostic system, set datalogger signal - Electric Fan PWM Control Commanded (0x03F9) - to 30% (using output state control)
Does the cooling fan operate?
- Yes
  GO to A7.
- No
  GO to A8.
A7: ELECTRIC FAN PWM CONTROL
1. Using the manufacturer approved diagnostic system, set datalogger signal - Electric Fan PWM Control Commanded (0x03F9) - to 90% (using output state control)
Did the cooling fan speed increase?
- Yes
  No fault found. Verify customer concern of cooling fan operation. GO
  
  to A9.
- No
  GO to A8.
A8: WIRING CHECK
1. Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the cooling fan motor control module circuits for short circuit to ground, short circuit to power, open circuit, high resistance
Were any circuit faults present?
- Yes
  Repair the wiring harness as necessary. GO to A9.
- No
  GO to A9.
A9: COOLING FAN VALIDATION PROCEDURE
1. Ensure that the hood is closed
2. Start the engine
3. Set the air conditioning to on, set the temperature to cold and the fan speed to fast
4. Allow the engine to reach normal operating temperature (approximately 90°C)
5. Using the manufacturer approved diagnostic system, check datalogger signals - Engine Coolant Temperature (0xF405) - and - Electric Fan PWM Control Commanded (0x03F9). As the engine coolant temperature reaches normal operating temperature, the fan speed should increase between the values of 9% and 90%
  Did the cooling fan speed increase speed as engine coolant temperature increased?
  - Yes
    Return vehicle to customer
  - No
    Contact Dealer Technical Support