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Pinpoint Test C: DTC P0620

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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. C1 CHECK THE BATTERY CONDITION 
    • Carry out the Battery - Condition Test to determine if the battery can hold a charge and is OK for use. Refer to PINPOINT TEST A: BATTERY CONDITION TEST .
    • Does the battery pass the condition test? 
    • Yes  : GO to C2.
    • No  : INSTALL a new battery. REFER to GENERAL PROCEDURES . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. C2 CHECK THE GENERATOR B+ CONNECTION 
    • Ignition OFF.
    • Disconnect: Generator C102A (gas) or C1104A (diesel).
    • Inspect generator C102B, circuit SDC14 (RD) (gas) or C1104B, circuit SDC14 (RD) (diesel). Connector should be installed correctly and tight. Inspect the connector for bent and/or pushed out pins.
    • Measure the voltage between generator B+ C102B, circuit SDC14 (RD) (gas) or C1104B, circuit SDC14 (RD) (diesel) and ground.
      Fig 1: Measuring Voltage Between Generator B+ C102B, Circuit SDC14 (RD) (Gas) Or C1104B, Circuit SDC14 (RD) (Diesel) And Ground
      G06065172Courtesy of FORD MOTOR CO.
    • Are the generator connections OK and does the generator B+ measure battery voltage? 
    • Yes  : GO to C3.
    • No  : REPAIR the generator connection or circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  3. C3 CHECK THE VOLTAGE DROP IN THE B+ CIRCUIT 
    • Ignition OFF.
    • Connect: Generator C102A (gas) or C1104A (diesel).
    • Start the engine.
    • With the engine running at idle, headlamps ON and the heater blower set to HIGH, measure the voltage drop between generator B+ C102B, circuit SDC14 (RD) (gas) or C1104B, circuit SDC14 (RD) (diesel) and the positive battery terminal.
      Fig 2: Checking Voltage Drop In B+ Circuit
      G06065171Courtesy of FORD MOTOR CO.
    • Is the voltage drop less than 0.5 volt? 
    • Yes  : GO to C4.
    • No  : REPAIR the circuit B+ SDC14 (RD) and the positive battery cable for loose connections, physical damage or wire corrosion. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. C4 "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 section. 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.
    • Disconnect: Generator C102A (gas) or C1104A (diesel).
    • Using a 12-volt test lamp connected to ground, check for voltage at generator C102A-3, circuit SDC14 (RD) (gas) or C1104A-3, circuit SDC14 (RD) (diesel), harness side.
      Fig 3: Checking Voltage At Generator C102A-3, Circuit SDC14 (RD) (Gas) Or C1104A-3, Circuit SDC14 (RD) (Diesel), Harness Side
      G06098957Courtesy of FORD MOTOR CO.
    • Does the test lamp illuminate? 
    • Yes  : GO to C5.
    • No  : VERIFY the fusible link is OK. If OK, REPAIR circuit SDC14 (RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAM article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. C5 CHECK THE GENERATOR COMMAND LINE FAULT (GENCMD_LF) PID 
    • Start and idle the engine.
      • NOTE: Many of the PCM PIDs selected will be monitored later in this pinpoint test.
    • With the engine still running at idle, select and monitor the following PCM PIDs:
      • Generator Monitor (GENMON).
      • Generator Command (GENCMD).
      • Generator Command Line Fault (GENCMD_LF).
    • Does the GENCMD_LF PID display a fault? 
    • Yes  : GO to C6.
    • No  : GO to  C9.
  6. C6 CHECK THE GENCOM CIRCUIT FOR A SHORT TO POWER 
    • Ignition OFF.
    • Disconnect: Generator C102A (gas) or C1104A (diesel).
    • Ignition ON.
    • Measure the voltage between generator C102A-2, circuit CDC10 (BU/OG) (gas) or C1104A-2, circuit CDC09 (YE) (diesel), harness side and ground.
      Fig 4: Measuring Voltage Between Generator C102A-2, Circuit CDC10 (BU/OG) (Gas) Or C1104A-2, Circuit CDC09 (YE) (Diesel) And Ground
      G06065174Courtesy of FORD MOTOR CO.
    • Does voltage read 1 volt or less? 
    • Yes  : GO to C7.
    • No  : GO to  C11.
  7. C7 COMPARE THE PCM PIDs GENERATOR MONITOR (GENMON) AND GENERATOR COMMAND (GENCMD) 
    • Ignition OFF.
    • Connect a fused jumper wire between:
      • For gasoline engines  , generator C102A-1, circuit CDC15 (VT), harness side and generator C102A-2, circuit CDC10 (BU/OG), harness side.
      • For diesel engines  , generator C1104A-1, circuit CDC15 (VT), harness side and generator C1104A-2, circuit CDC09 (YE), harness side.
        Fig 5: Connecting Fused Jumper Wire Between Generator C102A-1, Circuit CDC15 (VT) And C102A-2, Circuit CDC10 (BU/OG), Harness Side
        G06065167Courtesy of FORD MOTOR CO.
    • Start the engine.
    • Monitor the GENMON and GENCMD PIDs while performing a Wiggle Test on the generator harness.
    • Does the GENMON PID read within 2% of the GENCMD PID? 
    • Yes  : GO to C8.
    • No  : GO to  C12.
  8. C8 CHECK THE GENERATOR COMMAND CIRCUIT FOR DAMAGE OR AN OPEN 
    • Ignition OFF.
    • Disconnect: PCM C175B or PCM C1232B.
    • Inspect the following harness connectors for damaged or pushed-out pins:
      • PCM C175B-53, circuit CDC10 (BU/OG) (gas) or C1232B-53, circuit CDC09 (YE) (diesel).
      • Generator C102A-2, circuit CDC10 (BU/OG) (gas) or C1104A-2, circuit CDC09 (YE) (diesel).
    • For gasoline engines  , measure the resistance between PCM C175B-53, circuit CDC10 (BU/OG), harness side and generator C102A-2, circuit CDC10 (BU/OG), harness side.
    • For diesel engines  , measure the resistance between PCM C1232B-53, circuit CDC09 (YE), harness side and generator C1104A-2, circuit CDC09 (YE), harness side.
      Fig 6: Checking Generator Command Circuit For Damage Or Open
      G07974093Courtesy of FORD MOTOR CO.
    • Are the connectors and pins free of damage and is the resistance less than 5 ohms? 
    • Yes  : GO to C9.
    • No  : REPAIR circuit CDC09 (YE) or CDC10 (BU/OG). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  9. C9 CHECK THE GENERATOR COMMAND CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: Generator C102A (gas) or C1104A (diesel) (if not previously disconnected).
    • Measure the resistance between the generator C102A-2, circuit CDC10 (BU/OG) (gas) or C1104A-2, circuit CDC09 (YE) (diesel), harness side and ground.
      Fig 7: Checking Generator Command Circuit For Short To Ground
      G07974094Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to C10.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  10. C10 CHECK THE CHARGING SYSTEM CIRCUITS FOR INTERMITTENT FAULTS 
    • Connect: Generator C102A (gas) or C1104A (diesel).
    • Connect: PCM C175B (gas) or C1232B (diesel).
    • Ignition ON.
    • Clear all DTCs.
    • Start the engine and let the engine run for 5 minutes.
    • Retrieve Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.
    • Did any charging system DTC get stored into memory? 
    • Yes  : INSTALL a new generator. REFER to GENERATOR - GASOLINE ENGINES , GENERATOR - 6.7L DIESEL, SINGLE GENERATOR  or GENERATOR - 6.7L DIESEL, DUAL GENERATOR . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : The fault is not present at this time. This may indicate an intermittent fault. CARRY OUT a wiggle test on the charging system circuits to try and recreate the concern. CHECK generator connections for corrosion, loose connections and/or bent terminals. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  11. C11 CHECK FOR SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: PCM C175B (gas) or C1232B (diesel).
    • Ignition ON.
    • Measure the voltage between generator C102A-2, circuit CDC10 (BU/OG) (gas) or C1104A-2, circuit CDC09 (YE) (diesel), harness side and ground.
      Fig 8: Measuring Voltage Between Generator C102A-2, Circuit CDC10 (BU/OG) (Gas) Or C1104A-2, Circuit CDC09 (YE) (Diesel) And Ground
      G06065174Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
  12. C12 INSPECT GENERATOR CIRCUITS 
    • Ignition OFF.
    • Disconnect: PCM C175B (gas) or C1232B (diesel).
    • For gasoline engines  , inspect the following connector pins for damage and/or corrosion:
      • PCM C175E-50, circuit GD113 (BK/YE)
      • generator C102A-1, circuit CDC15 (VT)
      • generator C102A-2, circuit CDC10 (BU/OG)
    • For diesel engines  , inspect the following connector pins for damage and/or corrosion:
      • PCM C1232B-2, circuit GD113 (BK/YE)
      • generator C1104A-1, circuit CDC15 (VT)
      • generator C1104A-2, circuit CDC09 (YE)
    • Are the connectors OK? 
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