Pinpoint Test A: Cooling Fan Tests

WARNING: This page is about a different variant/trim than selected.

A1: CHECK FOR COOLING FAN RELATED S
1. Using the manufacturer approved diagnostic system, check the powertrain control module for the following cooling fan related DTC s (with any third byte):
  - P0480 Fan 1 Control Circuit
  - P0481 Fan 2 Control Circuit
  - P0483 Fan Rationality Check
  Are any cooling fan related DTC s 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 S
1. Using the manufacturer approved diagnostic system check the powertrain control module for DTC s
  Are any other DTC s 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
WARNING: 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% when the cooling fan is operating?
  
  Is the datalogger signal value between 5% and 16% when the cooling fan is operating?
  
  Yes: GO to A8.
  
  No: GO to A6.
A6: COOLING FAN IS NOT OPERATING
CAUTION: Make sure 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 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 appropriate wiring system diagrams 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. Make sure 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 Retailer Technical Support