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Pinpoint Test C: DTC P0620 - Generator Control Circuit

WARNING: This page is about a different car, the 2009 Ford Flex. 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. 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 BATTERY, MOUNTING AND CABLES .
    • Does the battery pass the condition test? 
    • Yes  : GO to C2.
    • 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. C2 CHECK THE GENERATOR B+ CONNECTION 
    • Ignition OFF.
    • Inspect generator C102A connection. Connector should be installed correctly and tight. Inspect the connector for bent and/or pushed out pins.
    • Inspect generator C102B, circuit SDC14 (RD). Connection should be tight.
    • Measure the voltage between generator C102B, B+ circuit SDC14 (RD) and ground.
      Fig 1: Checking Generator B+ Connection
      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 SDC14 (RD) 
    • Ignition OFF.
    • Connect: Generator C102A.
    • Start the engine.
    • With the engine running at idle, headlamps on and blower on high, measure the voltage drop between generator B+ C102B, circuit SDC14 (RD) and the positive battery terminal.
      Fig 2: Checking Voltage Drop In B+ Circuit SDC14 (RD)
      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: 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 glass bulb style test lamp is required for this step. This circuit will not be loaded properly using an LED-style test lamp.
    • Disconnect: Generator C102A.
    • Ignition ON.
    • Using a 12-volt test lamp connected to ground, check for voltage at generator C102A-3, circuit SBB17 (RD), harness side.
    • Does the test lamp illuminate? 
    • Yes  : GO to C5.
    • No  : VERIFY Battery Junction Box (BJB) fuse 17 (10A) is OK. If OK, REPAIR circuit SBB17 (RD). If not OK, REFER to the appropriate Systems 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. C5 CHECK THE GENERATOR COMMAND LINE FAULT (GENCMD_LF) PID 
    • NOTE: Many of the PCM PIDs selected will be monitored later in this pinpoint test.
    • Select and monitor the following PCM PIDs:
      • Generator Monitor (GENMON).
      • Generator Command (GENCMD).
      • Generator Command Line Fault (GENCMD_LF).
    • With the engine still running at idle, monitor the GENCMD_LF PID.
    • Is the GENMON_LF PID ON? 
    • Yes  : GO to C6.
    • No  : GO to  C9.
  6. C6 CHECK THE GENCOM CIRCUIT FOR A SHORT TO POWER 
    • Ignition OFF.
    • Disconnect: Generator C102A.
    • Ignition ON.
    • Measure the voltage between generator C102A-2, circuit CDC10 (BU/OG), harness side and ground.
      Fig 3: Checking Gencom Circuit For Short To Power
      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 generator C102A-1, circuit CDC15 (VT), harness side and generator C102A-2, circuit CDC10 (BU/OG), harness side.
      Fig 4: Checking PCM PID Generator Monitor And Generator Command
      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 5% of the GENCMD PID? 
    • Yes  : GO to C8.
    • No  : GO to  C12.
  8. C8 CHECK CIRCUIT CDC10 (BU/OG) FOR DAMAGE OR AN OPEN 
    • Ignition OFF.
    • Disconnect: PCM C175B.
    • Inspect the following harness connectors for damaged or pushedout pins:
      • PCM C175B-22, circuit CDC10 (BU/OG).
      • Generator C102B-2, circuit CDC10 (BU/OG).
    • Measure the resistance between PCM C175B-22, circuit CDC10 (BU/OG), harness side and generator C102A-2, circuit CDC10 (BU/OG), harness side.
      Fig 5: Checking Circuit CDC10 (BU/OG) For Damage Or An Open
      G06065176Courtesy 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 CDC10 (BU/OG). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  9. C9 CHECK CIRCUIT CDC10 (BU/OG) FOR SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: Generator C102A (if not previously disconnected).
    • Measure the resistance between the generator C102A-2, circuit CDC10 (BU/OG), harness side and ground.
    • 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.
    • Connect: PCM C175B.
    • 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 . 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.
    • Ignition ON.
    • Measure the voltage between generator C102A-2, circuit CDC10 (BU/OG), harness side and ground.
      Fig 6: Checking For Short To Voltage
      G06065177Courtesy of FORD MOTOR CO.
    • Does voltage read 0 volt? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : REPAIR circuit CDC10 (BU/OG). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  12. C12 INSPECT GENERATOR CIRCUITS 
    • Ignition OFF.
    • Disconnect: PCM C175B.
    • Inspect the following connector pins for damage and/or corrosion, PCM ground C175B-66, circuit GD113 (BK/YE), generator C102A-1, circuit CDC15 (VT) and generator C102A-2, circuit CDC10 (BU/OG).
    • Are the connectors OK? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : REPAIR high resistance or loose connections in the affected circuit(s). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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