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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 818 (Charging System) >> Diagnosis And Testing >> Charging System >> Pinpoint Tests >> Pinpoint Test E : P065B >> Pinpoint Test E : P065B

Pinpoint Test E : P065B

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Make sure battery voltage is greater than 12.2 volts prior to carrying out this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.

  1. E1 CHECK THE BATTERY CONDITION

    Does the battery pass the condition test? 

    Yes  GO to  E2.
    No  INSTALL a new battery. REFER to Battery, Mounting and Cables .

  2. E2 CHECK THE GENERATOR CONNECTIONS

    • Ignition OFF.
    • Disconnect and inspect all generator 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 the generator connectors. Make sure they seat, latch correctly and are tightened to specification. Refer to Generator and Regulator .
    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      GFD135809Courtesy of FORD MOTOR COMPANY
      GFD134422Courtesy of FORD MOTOR COMPANY
      GFD136643Courtesy of FORD MOTOR COMPANY
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C102A-1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 0.5 volt of recorded battery voltage? 

    Yes  GO to  E3.
    No  VERIFY BJB MEGA fuse (350 A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the Possible Sources of the circuit short.

  3. E3 "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 article. 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 C102B .
    • Measure battery voltage and record:
      Positive Lead Measurement / Action Negative Lead
      GFD135809Courtesy of FORD MOTOR COMPANY

      Battery Positive Post
      GFD134422Courtesy of FORD MOTOR COMPANY
      GFD136643Courtesy of FORD MOTOR COMPANY

      Battery Negative Post
    • Ignition ON.
    • Connect a 12-volt test lamp to ground to load the circuit.
    • With the meter and load connected to the circuit, perform a wiggle test on the generator harness.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C102B-3 Test Lamp Ground

    Is the "A" sense voltage equal to battery voltage? 

    Yes  GO to  E4.
    No  VERIFY BJB fuse 26 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the Possible Sources of the circuit short.

  4. E4 CHECK THE GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID

    • Connect: Generator C102B .
    • Start the engine.
    • Using a diagnostic scan tool, view the PCM PIDs.
    • Monitor the GENMON_HZ PID.

    Does the PID read between 80-200 Hz? 

    Yes  GO to  E8.
    No  GO to  E5.

  5. E5 CHECK THE GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID WITH GENERATOR DISCONNECTED

    • Ignition OFF.
    • Disconnect: Generator C102B .
    • Start the engine.
    • Using a diagnostic scan tool, view the PCM PIDs.
    • Monitor the GENMON_HZ PID.

    Does the PID read between 0-2 Hz? 

    Yes  GO to  E7.
    No  GO to  E6.

  6. E6 CHECK GENERATOR MONITOR CIRCUIT

    • Ignition OFF.
    • Carefully back-probe and connect a fused jumper wire:

      Measure: 

      Positive Lead Measurement / Action Negative Lead
      C175B-26
      GFD135987Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Start the engine.
    • Using a diagnostic scan tool, view the PCM PIDs.
    • Monitor the GENMON_HZ PID.

    Does the PID read 0 Hz? 

    Yes  INSPECT the harness for wire to wire shorts or insulation chaffing, mis-pinned connectors and correct wire colors and REPAIR the circuit as needed.
    No  GO to  E9.

  7. E7 MONITOR THE GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID WHILE ACTIVATING THE GENERATOR VOLTAGE DESIRED (GENVDSD) PID

    • Ignition OFF.
    • Connect a fused jumper wire:
      Positive Lead Measurement / Action Negative Lead
      C102B-1
      GFD135987Courtesy of FORD MOTOR COMPANY
      		 C102B-2
    • Start the engine.
    • Using a diagnostic scan tool, view the PCM PIDs.
    • With the engine running at idle, set the active command GENVDSD PID to 14 volts.
    • Monitor the GENMON_HZ PID.

    Does the PID read between 120-130 Hz? 

    Yes  INSTALL a new generator. REFER to Generator and Regulator .
    No  GO to  E9.

  8. E8 CHECK THE GENERATOR COMMAND LINE FAULT (GENCMD_LF) PID

    • Start the engine.
    • Using a diagnostic scan tool, view the PCM PIDs.
    • With the engine running and all selectable loads OFF, monitor the GENCMD_LF PID.

    Does the PID fluctuate from YES FAULT to NO FAULT? 

    Yes  INSTALL a new generator. REFER to Generator and Regulator .
    No  The system is operating correctly at this time. The concern may have been caused by an intermittently loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  9. E9 CHECK FOR CORRECT PCM 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
    • Reconnect the PCM 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 TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to Electronic Engine Controls .
    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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