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Home >> Ford >> 2023 >> Escape ST-Line Hybrid >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling - 2.5L DURATEC - Hybrid (121KW 164PS) (BG) >> 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 - 2.5L for schematic and connector information.

    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 mismatch in the commanded and received heat exchanger valve position and the coolant temperature difference between inlet and outlet is within range.

    Possible Sources 

    • Wiring, terminals or connectors
    • For Escape/Kuga: BJB Fuse 7 (15A)
    • For Maverick: BJB Fuse 8 (15A)
    • PCM
    • Frozen valve / Broken linkages
    • Valve alignment
    • Faulty position sensor
    • Clogged heat exchanger
    • Hoses
    • Coolant leaks

  2. D1 CHECK THE EXHAUST HEAT EXCHANGER PID (PARAMETER IDENTIFICATION)

    Access the PCM and monitor the EHE_EBVA_POS_STPID

    • Record the fault status codes.

    Is fault status code 3 or 160 hZ present? 

    Yes  SWITCH the ignition to the OFF position. GO to  D2
    No  GO to  D8

  3. D2 CHECK THE EXHAUST HEAT EXCHANGER FOR DAMAGE

    • Visually inspect the exhaust heat exchanger for damage or signs of failure.

    • Residual condensation from normal operation can freeze the exhaust heat exchanger valve restricting its movement. Using the Hybrid Engine Running Diagnostic Mode, run the engine to operating temperature to melt any residual ice build-up in the exhaust heat exchanger.

    Access the PCM and monitor the EHE_EBVA_POS_STPID

    • Using the diagnostic scan tool, retrieve all DTCs.

    • Record the fault status codes.

    Was DTC P237C, P237D, P237E, P237F, P2C22 or P2C23 set and is fault status code 3 or 160 hZ present? 

    Yes  INSTALL a new muffler and tailpipe. REFER to: Muffler and Tailpipe - Full Hybrid Electric Vehicle (FHEV) .
    No  CLEAR Diagnostic Trouble Codes (DTCs). For Escape/Kuga: GO to  D3For Maverick: GO to  D5

  4. D3 CHECK THE BJB (BATTERY JUNCTION BOX) FUSE 7 (15A)

    • Disconnect BJB Fuse 7 (15A).

    • Visually inspect the BJB Fuse 7 (15A).

    Is the fuse blown? 

    Yes  Repair the circuit for a short to ground. Install a new fuse.
    No  GO to  D4

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

    • Install BJB Fuse 7 (15A).

    • Disconnect exhaust heat exchanger exhaust bypass valve C3236.

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 3
      GFD750644Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is battery voltage present? 

    Yes  GO to  D7
    No  REPAIR the circuit.

  6. D5 CHECK THE BJB (BATTERY JUNCTION BOX) FUSE 8 (15A)

    • Disconnect BJB Fuse 8 (15A).

    • Visually inspect the BJB Fuse 8 (15A).

    Is the Fuse blown? 

    Yes  Repair the circuit for a short to ground. Install a new fuse.
    No  GO to  D6

  7. D6 CHECK THE EXHAUST HEAT EXCHANGER BYPASS VALVE CIRCUITS FOR AN OPEN

    • Install BJB Fuse 8 (15A).

    • Disconnect exhaust heat exchanger exhaust bypass valve C3236.

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 3
      GFD750644Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is battery voltage present? 

    Yes  GO to  D7
    No  REPAIR the circuit.

  8. D7 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE GROUND CIRCUIT FOR AN OPEN CIRCUIT

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 1
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less then 5 ohms? 

    Yes  GO to  D8
    No  REPAIR the circuit.

  9. D8 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

    • Disconnect exhaust heat exchanger exhaust bypass valve C3236.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 2
      GFD750644Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3236 Pin 4
      GFD750644Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is there any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  D9

  10. D9 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CONTROL CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 2
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3236 Pin 4
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  D10
    No  REPAIR the circuit.

  11. D10 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CONTROL CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 2
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C1381B Pin 63
      C3236 Pin 4
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C1381B Pin 8

    Are the resistances less than 3 ohms? 

    Yes  GO to  D11
    No  REPAIR the circuit.

  12. D11 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3236 Pin 1
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C3236 Pin 2
      C3236 Pin 1
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C3236 Pin 4
      C3236 Pin 2
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C3236 Pin 3
      C3236 Pin 2
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C3236 Pin 4
      C3236 Pin 3
      GFD750645Courtesy of FORD MOTOR COMPANY
      		 C3236 Pin 4

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  D12
    No  REPAIR the circuit.

  13. D12 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.

    • Reconnect exhaust heat exchanger exhaust bypass valve connector.

    • 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, INSTALL a new PCM. Refer to the POWERTRAIN CONTROL MODULE (PCM) . If the condition is still present, INSTALL a new muffler and tailpipe. REFER to: Muffler and Tailpipe - Full Hybrid Electric Vehicle (FHEV) .
    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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