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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 747 (Engine Controls - Pinpoint Tests - 6.0L Diesel (99P E-Series & 99P F450/550)) >> Pinpoint Test AF: Glow Plug System >> Test Procedure

Test Procedure

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  1. AF1 PRELIMINARY DIAGNOSIS 
    • Key off.
    • Perform a visual inspection.
    • Key on, engine off.
    • Perform the KOER Glow Plug Monitor Self-Test.

    Is DTC P0670, P0671, P0672, P0673, P0674, P0675, P0676, P0677, P0678 or P0683 present? 

    Yes No
    NOTE: IF DTC P0670 and P0683 are present, perform DTC P0670 diagnostics before performing DTC P0683.
    		 Unable to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.
    For DTC P0671, P0672, P0673, P0674, P0675, P0676, P0677 or P0678Go to  AF2.
    For DTC P0670, Go to  AF8.
    For DTC P0683, Go to  AF16.
  2. AF2 DIAGNOSTIC TROUBLE CODES P0671, P0672, P0673, P0674, P0675, P0676, P0677 OR P0678 
    NOTE: Refer to the wiring diagram Figure at the beginning of this pinpoint test.
    NOTE: Glow plugs are numbered front to rear with even numbers on left side of engine.
    NOTE: Use the wiring diagram to match the connector pins with the DTCs.
    • Possible causes:
      • glow plug circuit open
      • glow plug circuit shorted
      • GPCM
      • glow plug
    • Key off.
    • Disconnect the suspect glow plug bus bar.
    • Check for loose, damaged or backed out terminals.
    • Measure the resistance between the suspect glow plug bus bar pin, component side and ground.

    Is the resistance between 0.5 and 2 ohms? 

    Yes No
    Go to  AF4. Go to  AF3.
  3. AF3 CHECK THE GLOW PLUG CIRCUIT BETWEEN THE BUS BAR CONNECTOR AND THE GLOW PLUG 
    • Disconnect the bus bar harness from the glow plugs.
    • Measure the resistance between the suspect glow plug bus bar pin, harness side and the suspect glow plug pin, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    INSTALL a new glow plug. INSTALL a new bus bar.
  4. AF4 CHECK THE GLOW PLUG VOLTAGE 
    • Disconnect the suspect GPCM connector.
    • Key on, engine off.
    • Measure the voltage between the GPCM connector VBATT circuit pin 3, harness side and ground.

    Is the voltage greater than 10 volts? 

    Yes No
    Go to  AF5. REPAIR the circuit.
  5. AF5 CHECK THE GLOW PLUG CIRCUIT FOR AN OPEN 
    • Key off.
    • Measure the resistance between the suspect glow plug GPCM connector pin, harness side and the glow plug bus bar pin, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    Go to  AF6. REPAIR the circuit.
  6. AF6 CHECK THE GLOW PLUG CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the suspect glow plug GPCM connector pin, harness side and ground.

    Is the resistance greater than 10,000 ohms? 

    Yes No
    Go to  AF7. REPAIR the circuit.
  7. AF7 CHECK THE GLOW PLUG CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key on, engine off.
    • Measure the voltage between the suspect glow plug GPCM connector pin, harness side and ground.

    Is any voltage indicated? 

    Yes No
    REPAIR the circuit. INSTALL a new GPCM.
  8. AF8 DIAGNOSTIC TROUBLE CODE P0670 
    NOTE: Refer to the PCM and component connector pin numbers, Figure, at the beginning of this pinpoint test.
    • Possible causes:
      • control line open
      • control line shorted to ground or power
      • PCM
      • GPCM
    • Key off.
    • Disconnect the PCM.
    • Disconnect the GPCM (green connector).
    • Measure the resistance between the green GPCM connector pin 8, harness side and the PCM engine harness connector pin 3, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    Go to  AF9. REPAIR the circuit.
  9. AF9 CHECK THE CONTROL CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the green GPCM connector pin 8, harness side and ground.

    Is the resistance greater than 10,000 ohms? 

    Yes No
    Go to  AF10. REPAIR the circuit.
  10. AF10 CHECK THE CONTROL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key on, engine off.
    • Measure the voltage between the green GPCM connector pin 8, harness side and ground.

    Is any voltage indicated? 

    Yes No
    REPAIR the circuit. Go to  AF12.
  11. AF12 CHECK THE GPCM FOR VOLTAGE 
    • Key off.
    • Disconnect the GPCM (black connector).
    • Key on, engine off.
    • Measure the voltage between the black GPCM connector pin 9, harness side and ground.

    Is the voltage greater than 10 volts? 

    Yes No
    Go to  AF13. REPAIR the circuit in question.
  12. AF13 CHECK THE GPCM CONTROL CIRCUIT 
    • Key off.
    • Reconnect the GPCM connectors.
    • Key on, engine off.
    • Measure the voltage between the PCM engine harness connector pin 3, harness side and ground.

    Is the voltage greater than 10 volts? 

    Yes No
    INSTALL a new PCM. INSTALL a new GPCM.
  13. AF16 DIAGNOSTIC TROUBLE CODE P0683 
    NOTE: Refer to the PCM and component connector pin numbers, Figure, at the beginning of this pinpoint test.
    • Possible causes:
      • diagnostic line open
      • diagnostic line shorted to ground
      • diagnostic line shorted to power
      • PCM
      • GPCM
    • Key off.
    • Disconnect the PCM.
    • Disconnect the GPCM (green connector).
    • Measure the resistance between the green GPCM connector pin 9, harness side and the PCM engine harness connector pin 17, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    Go to  AF17. REPAIR the circuit.
  14. AF17 CHECK THE DIAGNOSTIC CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the green GPCM connector pin 9, harness side and ground.

    Is the resistance greater than 10,000 ohms? 

    Yes No
    Go to  AF18. REPAIR the circuit.
  15. AF18 CHECK THE DIAGNOSTIC CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key on, engine off.
    • Measure the voltage between the green GPCM connector pin 9, harness side and ground.

    Is any voltage indicated? 

    Yes No
    REPAIR the circuit. Go to  AF19.
  16. AF19 CHECK THE GPCM FOR VOLTAGE 
    • Key off.
    • Disconnect the GPCM (black connector).
    • Key on, engine off.
    • Measure the voltage between black GPCM connector pin 9, harness side and ground.

    Is the voltage greater than 10 volts? 

    Yes No
    Go to  AF20. REPAIR the circuit.
  17. AF20 CHECK THE GPCM OPERATION 
    • Key off.
    • Reconnect the GPCM.
    • Connect a 10A fused jumper wire between the PCM engine connector pin 3, harness side and ground.
    • Key on, engine off.
    • Measure the voltage between the PCM engine harness connector pin 17, harness side and ground.

    Is the voltage between 5 and 12 volts? 

    Yes No
    INSTALL a new PCM. INSTALL a new GPCM.
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