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Home >> Ford >> 2024 >> E-Transit Cutaway >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (Engine Cooling - 3.5L ECOBOOST (235KW/320PS)) >> Diagnosis And Testing >> Cooling Fan Control >> Pinpoint Tests >> Pinpoint Test A: Fan Control Relays >> Pinpoint Test A: Fan Control Relays

Pinpoint Test A: Fan Control Relays

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  1. Refer to Wiring Diagrams - Cooling Fan for schematic and connector information.

    Normal Operation and Fault Conditions 

    Refer to the DTC Fault Trigger Conditions.

    Although the PCM output circuits are called LFC, MFC, and HFC, cooling fan operation is controlled by a combination of these outputs.

    The cooling fan relays are integrated into the BJB and are not servicable.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0480:00 Fan 1 Control Circuit: No Sub Type Information Sets when the PCM detects excessive current draw from the low fan control circuit when activated; or voltage is not detected from the low fan control circuit when not activated. The PCM expects to detect vehicle power voltage coming through the low speed fan control relay coil to the low fan control circuit. When the LFC_F PID reads YES, a concern is present. A short to voltage can only be detected when the PCM is grounding the low fan control circuit.
    PCM P0481:00 Fan 2 Control Circuit: No Sub Type Information Sets when the PCM detects the high fan control output is commanded on (grounded) and excessive current draw is detected from the high fan control circuit; or when the high fan control circuit is commanded off and voltage is not detected from the high fan control circuit. The PCM expects to detect vehicle power voltage through the high speed fan control relay coil to the high fan control circuit. When the HFC_F PID reads YES, a concern is present. An open circuit or short to ground can only be detected when the PCM is not grounding the high fan control circuit. A short to voltage can only be detected when the PCM is grounding the high fan control circuit.

    Possible Causes 

    • Fan control circurtity concern
    • Cooling fan module
    • Cooling fan clutch solenoid
    • Fan control relay
    • PCM (12A650)

    Visual Inspection and Pre-checks 

    • Inspect cooling fans for blockage or debris that would prevent fan from rotating

  2. A1 CHECK THE PCM (POWERTRAIN CONTROL MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) 'S

    • Using a diagnostic scan tool, retrieve all DTC 's from the PCM.

    Is DTC P0480 or P0481 present? 

    Yes  GO to  A2
    No  The system is operating correctly at this time.

  3. A2 CHECK FOR COOLING FAN OPERATION

    • Ignition ON.

    • Using a diagnostic scan tool, access the PCM

      • Control the LFC (MODE) PID
      • Command the PID ON
      • Control the HFC (MODE) PID
      • Command the PID ON

    Do both of the cooling fans run? 

    Yes  The system is operating correctly at this time. CLEAR the PCMDTC 's. REPEAT the self-test.
    No  For Fan 1 faults, GO to  A3For Fan 2 faults, GO to  A7

  4. A3 CHECK COOLING FAN 1 CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Disconnect Cooling fan C1048.

    • Ignition ON.

    • Using a diagnostic scan tool, access the PCM

      • Control the LFC (MODE) PID
      • Command the PID ON

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1048 Pin 1
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 C1048 Pin 2

    Are the voltages greater than 10.5 V? 

    Yes  INSTALL a new cooling fan REFER to: Cooling Fan Motor and Shroud 
    . CLEAR the PCMDTC 's. REPEAT the self-test.
    No  GO to  A4

  5. A4 CHECK COOLING FAN 1 GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Cooling fan C1048.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1048 Pin 2
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 Ohms? 

    Yes  GO to  A5
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  6. A5 CHECK COOLING FAN 1 POWER CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Cooling fan C1048.

    Is the resistance less than 3 Ohms? 

    Yes  GO to  A6
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  7. A6 CHECK COOLING FAN 1 POWER CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect Cooling fan C1048.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1048 Pin 1
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less greater than 10 kOhms? 

    Yes  GO to  A11
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  8. A7 CHECK COOLING FAN 2 CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Disconnect Cooling fan C1078.

    • Ignition ON.

    • Using a diagnostic scan tool, access the PCM

      • Control the HFC (MODE) PID
      • Command the PID ON

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1078 Pin 1
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 C1078 Pin 2

    Are the voltages greater than 10.5 V? 

    Yes  INSTALL a new cooling fan REFER to: Cooling Fan Motor and Shroud 
    . CLEAR the PCMDTC 's. REPEAT the self-test.
    No  GO to  A8

  9. A8 CHECK COOLING FAN 2 GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Cooling fan C1078.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1078 Pin 2
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 Ohms? 

    Yes  GO to  A9
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  10. A9 CHECK COOLING FAN 2 POWER CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Cooling fan C1078.

    Is the resistance less than 3 Ohms? 

    Yes  GO to  A10
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  11. A10 CHECK COOLING FAN 2 POWER CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect Cooling fan C1078.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1078 Pin 1
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less greater than 10 kOhms? 

    Yes  GO to  A11
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  12. A11 CHECK THE VOLTAGE TO BJB (BATTERY JUNCTION BOX)

    • Ignition OFF.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B Pin 11
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1035E  Pin 1
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 10.5 V 

    Yes  GO to  A13
    No  REPAIR the open circuit, Clear the PCMDTC 's, REPEAT the self-test

  13. A12 CHECK FOR CORRECT PCM SIGNALS

    • Ignition OFF.

    • Ignition ON.

    • Using a diagnostic scan tool, access the PCM

      • Control the LFC (MODE) PID
      • Command the PID ON
      • Control the HFC (MODE) PID
      • Command the PID ON

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A Pin 38
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1035A Pin 37
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1035A Pin 33
      GFD836681Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances less than 3 Ohms? 

    Yes  INSTALL a new BJB CLEAR the PCMDTC 's. REPEAT the self-test.
    No  GO to  A13

  14. A13 CHECK THE RELAY CONTROL CIRCUITS FOR AN OPEN

    • Ignition OFF.

    Is the resistance less than 3 Ohms? 

    Yes  GO to  A14
    No  REPAIR the open circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  15. A14 CHECK THE RELAY CONTROL CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    Is the resistance greater than 10 kOhms? 

    Yes  GO to  A15
    No  REPAIR the short circuit. CLEAR the PCMDTC 's. REPEAT the self-test.

  16. A15 CHECK THE RELAY CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035A Pin 38
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1035A Pin 37
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1035A Pin 33
      GFD836682Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short circuit. CLEAR the PCMDTC 's. REPEAT the self-test.
    No  GO to  A16

  17. A16 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Disconnect Both PCM electrical connectors..

    • Using a good light source, inspect the PCM electrical connectors on both component and harness side for the following:

      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary

    • Connect the PCM electrical connectors. Make sure they seat and latch correctly.

    • Ignition ON.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  Diagnose PCM fault. REFER to: Powertrain Control Module (PCM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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