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Pinpoint Test E : DTC P0620, P065B

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NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.

  1. E1 PERFORM INSPECTION AND VERIFICATION

    • Perform Inspection and Verification procedure in this information.

    Was an obvious cause for an observed or reported concern found? 

    Yes  CORRECT the cause as necessary.
    No  GO to  E2

  2. E2 CHECK THE GENERATOR CONNECTIONS

    • Ignition OFF.

    • Disconnect all of the generator connectors and inspect for:

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

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

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      GFD410014Courtesy of FORD MOTOR COMPANY
      GFD409788Courtesy of FORD MOTOR COMPANY
      GFD410015Courtesy of FORD MOTOR COMPANY

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102B-1
      GFD409788Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 0.5 volt of the recorded battery voltage? 

    Yes  GO to  E3
    No  TIGHTEN or INSTALL a new generator B+ nut as needed. REFER to: Generator - 6.2L V8 . REFER to: Generator - 6.8L Triton-30V - V10 . VERIFY high current BJB fuse 2 (275A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

  3. E3 CHECK THE VOLTAGE DROP IN THE GENERATOR B+ CIRCUIT

    • Start the engine.

    • With the engine running at idle, headlamps on and blower on high, measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102B-1
      GFD409788Courtesy of FORD MOTOR COMPANY

    • Perform a wiggle test of the generator wiring and connections while measuring voltage drop.

    Is the voltage drop less than 0.5 volt? 

    Yes  GO to  E4
    No  INSPECT and REPAIR any corrosion in the generator B+ circuit and positive battery cable connections.

  4. E4 "A" SENSE CIRCUIT LOAD TEST

    NOTE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this information. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

    NOTE: This step puts a load on the "A" sense circuit. If there are corroded or loose connections, loading the circuit may help show the fault. A 250-350 mA incandescent 12 volt test lamp is required for this step. This circuit cannot be loaded correctly using an LED-style test lamp.

    • Ignition OFF.

    • Disconnect Generator C102A.

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      GFD410014Courtesy of FORD MOTOR COMPANY
      GFD409788Courtesy of FORD MOTOR COMPANY
      GFD410015Courtesy of FORD MOTOR COMPANY

    • Install a test lamp between:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102A-3
      GFD409972Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Perform a wiggle test on the generator wiring and measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102A-3
      GFD409788Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the "A" sense voltage within +/-0.5 volt of the recorded battery voltage? 

    Yes  GO to  E5
    No  VERIFY the high current BJB fuse 98 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

  5. E5 CHECK THE GENERATOR COMMAND CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C175B.

    • Ignition ON.

    • Perform a wiggle test on the generator wiring and measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102A-2
      GFD409788Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  E6

  6. E6 CHECK THE GENERATOR COMMAND CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Ignition ON.

    • Perform a wiggle test on the generator wiring and measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102A-2
      GFD409789Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E7
    No  REPAIR the circuit.

  7. E7 CHECK THE GENERATOR COMMAND CIRCUIT FOR AN OPEN

    • Perform a wiggle test on the generator wiring and measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C175B-13
      GFD409789Courtesy of FORD MOTOR COMPANY
      		 Refer to C102A-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  E8
    No  REPAIR the circuit.

  8. E8 COMPARE THE GENERATOR MONITOR (GENMON) AND GENERATOR COMMAND (GENCMD) PARAMETER IDENTIFICATIONS (PIDS)

    • Ignition OFF.

    • Connect PCM C175B.

    • Connect a fused jumper wire:
      Positive Lead Measurement / Action Negative Lead
      Refer to C102A-1
      GFD409790Courtesy of FORD MOTOR COMPANY
      		 Refer to C102A-2

    • Start the engine.

    • Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

    • Monitor the PCM Parameter Identifications (PIDs) GENMON and GENCMD.

    • Perform a wiggle test of the generator wiring and connections.

    Do the Parameter Identifications (PIDs) read within 5% of each other? 

    Yes  REMOVE the fused jumper wire. INSTALL a new generator. REFER to: Generator - 6.2L V8 . REFER to: Generator - 6.8L Triton-30V - V10 .
    No  REMOVE the fused jumper wire. GO to  E9

  9. E9 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM connectors.

    • Repair:

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

    • Connect all  connectors. Make sure they seat and latch correctly.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) 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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