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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1473 (Charging System) >> Diagnosis And Testing >> Pinpoint Tests >> Special Tool(s) >> Pinpoint Test D: DTC P0625 or P0626 >> Pinpoint Test D: DTC P0625 Or P0626

Pinpoint Test D: DTC P0625 Or P0626

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. 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 PINPOINT TEST A: BATTERY CONDITION TEST 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 -- NON-HYBRID . 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 CABLEPRO (RD), harness side. Connection should be tight.
    • Inspect generator radial adapter connection on rear of generator. Connection should be tight.
    • Measure the voltage between generator C102B, circuit CABLEPRO (RD) and ground.
      Fig 1: Checking Circuit CABLEPRO
      G06065172Courtesy of FORD MOTOR CO.
    • Are the generator C102B and radial arm adapter (if equipped) connections tight and does the generator B+ measure battery voltage? 
    • Yes:  GO to D3  .
    • No:  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 CABLEPRO (RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article 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 generator B+ C102B, circuit CABLEPRO (RD) and the positive battery terminal.
      Fig 2: Checking CABLEPRO (If Necessary)
      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 CABLEPRO (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.
    • Using a 12-volt test lamp connected to ground, check for voltage at C102A-3, circuit SDC06 (BN/RD), harness side.
      Fig 3: Checking Circuit SDC06
      G06098957Courtesy of FORD MOTOR CO.
    • Does the test lamp illuminate? 
    • Yes:  GO to D5  .
    • No:  VERIFY Battery Junction Box (BJB) fuse 6 (15A) is OK. If OK, REPAIR circuit SDC06 (BN/RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article 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 CIRCUIT CDC15 (VT) FOR DAMAGE OR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: PCM C175B.
    • Inspect the following harness connectors for damaged or pushed-out pins:
      • PCM C175B-14, circuit CDC15 (VT)
      • Generator C102A-1, circuit CDC15 (VT)
    • Measure the resistance between generator C102A-1, circuit CDC15 (VT), harness side and ground.
      Fig 4: Checking Connector(s) And/Or Circuit CDC15
      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 DISCONNECT .
    • Disconnect: Generator C102B.
    • Measure the resistance between generator C102B, component side and the generator housing.
      Fig 5: Measuring Resistance Between Generator C102B, Component Side And Generator Housing
      G06065180Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 25K ohms? 
    • Yes:  GO to D7  .
    • No:  INSTALL a new generator. REFER to GENERATOR - 2.5L  or GENERATOR - 3.0L . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  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 REFERENCE CHART

      Pin Expected Resistance
      1 Greater than 10K ohms
      2 Greater than 10K ohms
      3 Greater than 10K ohms
    • Are the resistance values as indicated? 
    • Yes:  GO to D8  .
    • No:  INSTALL a new generator. REFER to GENERATOR - 2.5L  or GENERATOR - 3.0L . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. D8 CHECK CIRCUIT CDC15 (VT) FOR DAMAGE OR AN OPEN 
    • Disconnect: PCM C175B.
    • Inspect the following harness connectors for damaged or pushed-out pins:
      • PCM C175B-14, circuit CDC15 (VT)
      • Generator C102A-1, circuit CDC15 (VT)
    • Measure the resistance between PCM C175B-14, circuit CDC15 (VT), harness side and generator C102A-1, circuit CDC15 (VT), harness side.
      Fig 6: Checking Connector(s) And/Or Circuit CDC15
      G06098982Courtesy 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 CIRCUIT CDC15 (VT) FOR A SHORT TO POWER 
    • Connect the battery. Refer to BATTERY DISCONNECT .
    • Ignition ON.
    • Measure the voltage between generator C102A-1, circuit CDC15 (VT), harness side and ground.
      Fig 7: Checking Connector(s) And/Or Circuit CDC15
      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 C175B.
    • 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 8: Connecting Fused Jumper Wire Between Generator C102A-1, CDC15 (VT) And Generator C102A-2, Circuit CDC10 (BU/OG)
      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? 
    • Yes:  INSTALL a new generator. REFER to GENERATOR - 2.5L  or GENERATOR - 3.0L . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  GO to D11  .
  11. D11 CHECK FOR CORRECT PCM OPERATION 
    • Ignition OFF.
    • Disconnect: Fused Jumper Wire.
    • Check the PCM harness, generator harness, PCM component side and generator component side connectors for:
      • corrosion.
      • pushed-out/bent pins.
    • Connect the PCM and/or generator connectors. Make sure the connectors seat 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) for 2.5L engines or POWERTRAIN CONTROL MODULE (PCM) for 3.0L engines. CLEAR the DTCs. REPEAT the self-test. 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. TEST the system for normal operation.
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