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Home >> Ford >> 2021 >> Explorer Limited Hybrid, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling - 3.3L DURATEC-V6 - Hybrid (BP) >> Diagnosis And Testing >> Engine Cooling >> Pinpoint Tests >> Pinpoint Test D : Exhaust Heat EXCHANGER Exhaust Bypass Valve

Pinpoint Test D : Exhaust Heat EXCHANGER Exhaust Bypass Valve

  1. Refer to ELECTRONIC ENGINE CONTROLS - 3.3L TIVCT for schematic and connector information.

    Normal Operation and Fault Conditions 

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P237F:00 Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Performance: No Sub Type Information This DTC sets when the PCM senses a valid position but has not changed since start up.
    PCM P2C22:00 Exhaust Heat Exchanger Exhaust Bypass Valve "A" Position Sensor Circuit: No Sub Type Information This DTC sets when the PCM senses a valid position but has not changed since start up.
    PCM P237C:00 Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Circuit/Open: No Sub Type Information This DTC sets when the PCM senses an open circuit to the exhaust heat exchanger exhaust bypass valve.
    PCM P237D:00 Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Circuit Low: No Sub Type Information This DTC sets when the PCM senses low voltage on the exhaust heat exchanger exhaust bypass valve.
    PCM P237E:00 Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Circuit High: No Sub Type Information This DTC sets when the PCM senses high voltage on the exhaust heat exchanger exhaust bypass valve.
    PCM P2C23:00 Exhaust Heat Exchanger Exhaust Bypass Valve "A" Position Sensor Performance: No Sub Type Information This DTC sets when the PCM senses a valid position but has not changed since start up.

    Possible Sources 

    • Wiring, terminals or connectors
    • BJB Fuse 7 (20A).
    • PCM
    • Frozen valve / Broken linkages
    • Valve alignment
    • Faulty position sensor
    • Clogged heat exchanger
    • Hoses
    • Coolant leaks
    • ECT 3 and ECT 4 failures

  2. D1 RETRIEVE AND RECORD ALL DTCS

    • Start the vehicle and allow engine to reach normal operating temperatures. Using the diagnostic scan tool, retrieve all DTCs.

    Was DTC P237C, P237D or P237E set? 

    Yes  GO to  D2
    No  The issue may not be the Transmission Fluid Heater Coolant Control Valve electrical system. REFER to Symptom Chart  .

  3. D2 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TO VOLTAGE

    • Disconnect BJB Fuse 7 (20A).

    • Disconnect PCM C175T.

    • Disconnect Exhaust heat exchanger exhaust bypass valve C4467.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4467-2
      GFD513100Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4467-3
      GFD513100Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4467-4
      GFD513100Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is there any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  D3

  4. D3 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4467-2
      GFD513101Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4467-3
      GFD513101Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  D4
    No  REPAIR the circuit.

  5. D4 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4467-1
      GFD513101Courtesy of FORD MOTOR COMPANY
      		 Ground
      Positive Lead Measurement / Action Negative Lead
      C4467-3
      GFD513101Courtesy of FORD MOTOR COMPANY
      		 BJB fuse 7 (20A) cavity, component side
      Positive Lead Measurement / Action Negative Lead
      C4467-2
      GFD513101Courtesy of FORD MOTOR COMPANY
      		 C175T-90
      C4467-4
      GFD513101Courtesy of FORD MOTOR COMPANY
      		 C175T-52

    Are the resistances less than 3 ohms? 

    Yes  GO to  D5
    No  REPAIR the circuit.

  6. D5 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TOGETHER

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  D6
    No  REPAIR the circuit.

  7. D6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all 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 all 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 .
    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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