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Pinpoint Test E: DTC P065B - Generator Control Circuit Range/Performance

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 
    • 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 E2  .
    • 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. E2 CHECK THE PCM GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID 
    • Start the engine.
    • NOTE: Many of the PCM PIDs selected will be monitored later in this pinpoint test.
    • Select and monitor the following PCM PIDs:
      • Generator Voltage Desired (GENVDSD).
      • Generator Monitor Frequency (GENMON_HZ).
    • Monitor the GENMON_HZ PID.
    • Is the PID below 80 Hz or above 200 Hz? 
    • Yes:  GO to E3  .
    • 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.
  3. E3 CHECK THE PCM GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID WITH GENERATOR C102A DISCONNECTED 
    • Ignition OFF.
    • Disconnect: Generator C102A.
    • Start the engine.
    • Monitor the GENMON_HZ PID.
    • Does the PID read between 0-2 Hz? 
    • Yes:  GO to  E5.
    • No:  GO to E4  .
  4. E4 CHECK GENERATOR CIRCUITRY 
    • Ignition OFF.
    • NOTE: Care must be taken when back probing the connector to prevent damage to the weather pack insulator.
    • With the PCM connected, connect a fused jumper wire between PCM C175B-23, circuit CDC15 (VT) and ground by carefully back probing the PCM.
    • Start the engine.
    • 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 generator circuit CDC15 (VT) as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. E5 MONITOR THE PCM PID GENERATOR MONITOR FREQUENCY (GENMON_HZ) WHILE ACTIVATING THE GENERATOR VOLTAGE DESIRED (GENVDSD) PID 
    • 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 1: Connecting Fused Jumper Wire Between Generator C102A-1, Circuit CDC15 (VT) And Generator C102A-2, Circuit CDC10 (BU/OG)
      G06065167Courtesy of FORD MOTOR CO.
    • Start the engine.
    • With the engine at idle, set the output state control GENVDSD PID to 14 volts.
    • Monitor the GENMON_HZ PID.
    • Does the GENMON_HZ PID read between 120-130 Hz? 
    • Yes:  INSTALL a new generator. REFER to GENERATOR . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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