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Pinpoint Test F: Engine Coolant Temperature Sensor 4

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to ELECTRONIC ENGINE CONTROLS - 3.5L for schematic and connector information.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P2AFF:00 Engine Coolant Temperature Sensor 4 Circuit High: No Sub Type Information This DTC sets when the PCM senses high voltage on the ECT sensor 4 circuit, indicating a short to voltage.
    PCM P2AFD:00 Engine Coolant Temperature Sensor 4 Circuit Range/Performance: No Sub Type Information This DTC sets when the PCM senses voltage out of range on the ECT sensor 4 circuit.
    PCM P2AFE:00 Engine Coolant Temperature Sensor 4 Circuit Low: No Sub Type Information This DTC sets when the PCM senses low voltage on the ECT sensor 4 circuit, indicating a short to ground.

    Possible Sources 

    • Wiring, terminals or connectors
    • ECT sensor 4
    • PCM

  2. WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.
  3. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  4. NOTE: Before performing this pinpoint test, ensure the high voltage battery is at least 50 % charged. For charging information, refer to HIGH VOLTAGE BATTERY, MOUNTING AND CABLES .

  5. F1 CHECK THE COOLANT HOSE ROUTING

    NOTE: Routing of the coolant hoses is critical to proper engine cooling system operation.

    • Ignition OFF.

    • Check the cabin coolant heater system hose routing. Pay close attention to the diverter valve hose routing and the top and bottom ports of the bulkhead. View the system diagrams, Refer to DESCRIPTION AND OPERATION  .

    Are the coolant hoses routed correctly? 

    Yes  CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules. TEST system for normal operation. If the concern is still present, GO to  F2
    No  CORRECT the coolant hose routing. Refer to DESCRIPTION AND OPERATION  .

  6. F2 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 4 CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C175T.

    • Disconnect ECT Sensor 4 C4632.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4632-1
      GFD556837Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is there any voltage present? 

    Yes  REPAIR the circuit in question.
    No  GO to  F3

  7. F3 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 4 CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect joint connector C1591.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4632-1
      GFD556838Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4632-2
      GFD556838Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  F4
    No  REPAIR the circuit in question.

  8. F4 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 4 CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4632-1
      GFD556838Courtesy of FORD MOTOR COMPANY
      		 C175T-25
      C4632-2
      GFD556838Courtesy of FORD MOTOR COMPANY
      		 C1591-40

    Are the resistances less than 3 ohms? 

    Yes  GO to  F5
    No  REPAIR the circuit in question.

  9. F5 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 4 CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4632-1
      GFD556838Courtesy of FORD MOTOR COMPANY
      		 C4632-2

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  F6
    No  REPAIR the circuits.

  10. F6 CHECK FOR CORRECT POWERTRAIN CONTROL MODULE (PCM) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the PCM connectors.

    • Repair:

      • corrosion (replace connector or terminals - clean module pins)
      • damaged or bent pins - replace terminals/pins
      • pushed-out pins - replace pins as necessary

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

    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, refer to PCM GUIDED ROUTINE TESTING
    Internet Explorer version 11 or greater is required to perform this Pinpoint Test. 
    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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