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Pinpoint Test D: DTC P0625 Or P0626

WARNING: This page is about a different car, the 2014 Ford F-150. 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 and during this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.
  1. D1 CHECK THE BATTERY CONDITION 
    • Refer to BATTERY, MOUNTING AND CABLES and carry out Pinpoint Test A: Battery Condition Test to determine if the battery can hold a charge and is OK for use.

    Does the battery pass the condition test? 

    • Yes  : GO to D2  .
    • No  : INSTALL a new battery. REFER to BATTERY, MOUNTING AND CABLES . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. D2 CHECK THE GENERATOR B+ CONNECTION 
    • Ignition OFF.
    • Inspect generator C102B  , circuit SDC14 (RD), harness side. Connection should be tight.
    • Inspect generator radial adaptor connection on rear of generator. Connection should be tight.
    • Measure the voltage between the generator B+ stud and ground.
      Fig 1: Measuring Voltage Between Generator B+ Stud And Ground
      G09545045Courtesy of FORD MOTOR CO.

    Are the generator C102B connections tight and does the generator B+ measure battery voltage? 

    • Yes  : GO to D3  .
    • No  : For 3.5L, 3.7L and 5.0L engines  , TIGHTEN or INSTALL a new C102B  (B+ nut) and/or radial arm adapter as needed. REFER to SPECIFICATIONS . VERIFY high current BJB  250A fuse is OK. If OK, REPAIR circuit SDC14 (RD). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      For 6.2L engines  , TIGHTEN or INSTALL a new C102B  (B+ nut) and/or radial arm adapter as needed. REFER to SPECIFICATIONS . VERIFY the fusible link is OK. If the fusible link is OK, REPAIR circuit SDC14 (RD). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

  3. D3 CHECK THE VOLTAGE DROP IN THE B+ CIRCUIT 
    • Start the engine.
    • With the engine running at idle, headlamps on and blower on high, measure the voltage drop between the generator B+ stud and the positive battery terminal.
      Fig 2: Measuring Voltage Drop Between Generator B+ Stud And Positive Battery Terminal
      G06291128Courtesy of FORD MOTOR CO.
    • Carry out a wiggle test of the generator wiring and connections while measuring voltage drop.

    Is the voltage drop less than 0.5 volt? 

    • Yes  : For DTC P0625  , GO to D4  .

      For DTC P0626  , GO to  D6.

    • No  : INSPECT circuit SDC14 (RD), radial arm adapter and the positive battery cable for loose connections, physical damage or wire corrosion. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. D4 "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 will not be loaded properly using an LED-style test lamp.
    • Ignition OFF.
    • Disconnect: Generator C102A  .
    • Ignition ON.
    • Measure battery voltage and record.
      Fig 3: Measuring Battery Voltage At Battery And Monitor PCM VPWR PID
      G06544266Courtesy of FORD MOTOR CO.
    • Using a 12-volt test lamp connected to ground, while performing a wiggle test on the generator harness, check for voltage at:
      • For 3.5L, 3.7L and 5.0L engines  , generator C102A-3  , circuit SBB45 (GY/RD), harness side.
      • For 6.2L engines  , generator C102A-3  , circuit SDC14 (RD), harness side.
        Fig 4: Performing Wiggle Test On Generator Harness Using 12-Volt Test Lamp Connected To Ground
        G06098957Courtesy of FORD MOTOR CO.

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

    • Yes  : GO to D5  .
    • No  : For 3.5L, 3.7L and 5.0L engines  , VERIFY high current BJB  250A fuse is OK. If OK, REPAIR circuit SBB45 (GY/RD). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

      For 6.2L engines,  VERIFY fusible links are OK. If OK, REPAIR circuit SDC14 (RD). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

  5. D5 CHECK GENMON CIRCUIT FOR DAMAGE OR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: PCM C1551B  (3.5L).
    • Disconnect: PCM C175B  (3.7L).
    • Disconnect: PCM C1381B  (5.0L and 6.2L).
    • Inspect the following harness connectors for damaged or pushed-out pins:
      • PCM C1551B-26  , circuit CDC15 (VT) (3.5L)
      • PCM C175B-14  , circuit CDC15 (VT) (3.7L)
      • PCM C1381B-14  , circuit CDC15 (VT) (5.0L and 6.2L)
      • Generator C102A-1  , circuit CDC15 (VT)
    • Measure the resistance between generator C102A-1  , circuit CDC15 (VT), harness side and ground.
      Fig 5: Measuring Resistance Between Generator C102A-1, Circuit CDC15 (VT) And Ground
      G06098980Courtesy of FORD MOTOR CO.

    Are the connectors and pins free of damage and is the resistance greater than 10, 000 ohms? 

    • Yes  : GO to  D10.
    • No  : REPAIR the connector(s) and/or circuit CDC15 (VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. D6 CHECK THE GENERATOR B+ RESISTANCE 
    • Ignition OFF.
    • NOTE: Failure to disconnect the battery will result in false resistance readings.

      Disconnect the battery. Refer to BATTERY, MOUNTING AND CABLES .

    • Disconnect: Generator C102B  .
    • Measure the resistance between generator C102B  , component side and the generator housing.
      Fig 6: Measuring Resistance Between Generator C102B, Component Side And Generator Housing
      G06065180Courtesy of FORD MOTOR CO.

    Is the resistance greater than 25K ohms? 

  7. D7 CHECK THE RESISTANCE OF THE VOLTAGE REGULATOR INTERNAL CIRCUITS TO GROUND 
    • Disconnect: Generator C102A  .
    • Measure the resistance between generator C102A  , component side and ground. Refer to the following table.
      Pin Expected Resistance
      1 Greater than 10K ohms
      2 Greater than 10K ohms
      3 Greater than 10K ohms

    Are the resistance values as indicated? 

  8. D8 CHECK THE GENMON CIRCUIT FOR DAMAGE OR AN OPEN 
    • Disconnect: PCM C1551B  (3.5L).
    • Disconnect: PCM C175B  (3.7L).
    • Disconnect: PCM C1381B  (5.0L and 6.2L).
    • Inspect the following harness connectors for damaged or pushed-out pins:
      • PCM C1551B-26  , circuit CDC15 (VT) (3.5L)
      • PCM C175B-14  , circuit CDC15 (VT) (3.7L)
      • PCM C1381B-14  , circuit CDC15 (VT) (5.0L and 6.2L)
      • Generator C102A-1  , circuit CDC15 (VT)
    • For 3.5L equipped vehicles,  measure the resistance between PCM C1551B-26  , circuit CDC15 (VT), harness side and generator C102A-1  , circuit CDC15 (VT), harness side.
      Fig 7: Measuring Resistance Between PCM C1551B-26, Circuit CDC15 (VT) And Generator C102A-1, Circuit CDC15 (VT)
      G07964271Courtesy of FORD MOTOR CO.
    • For 3.7L equipped vehicles,  measure the resistance between PCM C175B-14  , circuit CDC15 (VT), harness side and generator C102A-1  , circuit CDC15 (VT), harness side.
      Fig 8: Measuring Resistance Between PCM C175B-14, Circuit CDC15 (VT) And Generator
      G06291149Courtesy of FORD MOTOR CO.
    • For 5.0L an 6.2L equipped vehicles,  measure the resistance between PCM C1381B-14  , circuit CDC15 (VT), harness side and generator C102A-1  , circuit CDC15 (VT), harness side.
      Fig 9: Measuring Resistance Between PCM C1381B-14, Circuit CDC15 (VT) And Generator
      G06291149Courtesy of FORD MOTOR CO.

    Are the connectors and pins free of damage and is the resistance less than 5 ohms? 

    • Yes  : GO to D9  .
    • No  : REPAIR the connector(s) and/or circuit CDC15 (VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  9. D9 CHECK THE GENMON CIRCUIT FOR A SHORT TO POWER 
    • Connect the battery. Refer to BATTERY, MOUNTING AND CABLES .
    • Ignition ON.
    • Measure the voltage between generator C102A-1  , circuit CDC15 (VT), harness side and ground.
      Fig 10: Measuring Voltage Between Generator C102A-1, Circuit CDC15 (VT), Harness Side And Ground
      G06098983Courtesy of FORD MOTOR CO.

    Is there any voltage present? 

    • Yes  : REPAIR the connector(s) and/or circuit CDC15 (VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : GO to D10  .
  10. D10 COMPARE THE PCM PIDs GENERATOR MONITOR (GENMON) AND GENERATOR COMMAND (GENCMD) 
    • Ignition OFF.
    • Connect: PCM C1551B  (3.5L).
    • Connect: PCM C175B  (3.7L).
    • Connect: PCM C1381B  (5.0L and 6.2L).
    • Connect a fused jumper wire between generator C102A-1  , circuit CDC15 (VT), harness side and generator C102A-2  , circuit CDC10 (BU/OG), harness side.
      Fig 11: Connecting Fused Jumper Wire Between Generator C102A-1, CDC15 (VT), Harness Side And Generator
      G06065167Courtesy of FORD MOTOR CO.
    • Start the engine.
    • Using the active command, set the GENVDSD PID to 14.0 volts.
    • Monitor the GENMON and GENCMD PIDs while carrying out a wiggle test on the generator wiring harness.

    Does the GENMON PID read within 2% of the GENCMD PID? 

  11. D11 CHECK FOR CORRECT PCM OPERATION 
    • Ignition OFF.
    • Disconnect all the PCM  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Reconnect 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  : INSTALL a new PCM  . REFER to POWERTRAIN CONTROL MODULE (PCM) . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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