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Pinpoint Test E: DTC P065B

WARNING: This page is about a different car, the 2013 Ford Mustang. 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 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 GENERATOR B+ CONNECTION 
    • Ignition OFF.
    • Disconnect: Generator C102A.

      Inspect generator C102A for bent and/or pushed out pins.

    • Inspect the High Current Battery Junction Box (BJB) C167A for corrosion and make sure the connector is tight.
    • Inspect generator B+ connection:
      • For 3.7L, C102B, circuit SBF01 (RD). Connection should be tight.
      • For 5.0L and 5.8L, C102C, circuit SBF01 (RD). Connection should be tight.
    • Measure the voltage between ground and
      • For 5.0L and 5.8L, generator C102C, circuit SBF01 (RD).
      • For 3.7L, generator C102B, circuit SBF01 (RD).
        Fig 1: Checking Generator B+ Connection
        G06065172Courtesy of FORD MOTOR CO.
    • Are the generator and High Current Battery Junction Box (BJB) connections clean and tight and does the generator B+ connection measure battery voltage? 
    • Yes  : GO to E3.
    • No  : VERIFY the High Current Battery Junction Box (BJB) 200A fuse is OK. If OK, INSPECT for and REPAIR any corrosion or looseness in circuit SBF01 (RD), High-Current Battery Junction Box (BJB) C1617A, generator B+ C102B or C102C and positive battery cable connections. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If fuse is not OK, INSPECT and REPAIR the cause of the circuit short before replacing the High Current Battery Junction Box (BJB).
  3. E3 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  . 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 ON.
    • Using a 12-volt test lamp connected to ground, check for voltage at generator C102A-3, circuit SBB17 (RD), harness side.
      Fig 2: Checking For Voltage At C102A-3, Circuit SBB17 (RD) Using 12-Volt Test Lamp
      G06098957Courtesy of FORD MOTOR CO.
    • Does the test lamp illuminate? 
    • Yes  : GO to E4.
    • No  : VERIFY BJB fuse 17 (10A) is OK. If OK, REPAIR circuit SBB17 (RD). If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. E4 CHECK THE GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID 
    • Ignition OFF.
    • Connect: Generator C102A.

      Connector should be installed correctly and tight.

    • Start the engine.
    • NOTE: Many of the PCM PIDs selected are 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.
    • Does the PID read between 80-200 Hz? 
    • Yes  : GO to  E8.
    • No  : GO to E5.
  5. E5 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  E7.
    • No  : GO to E6.
  6. E6 CHECK GENERATOR CIRCUITRY 
    • Ignition OFF.
    • NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while making sure that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.

      With the PCM connected, connect a fused jumper wire between ground and:

      • For 5.0L and 5.8L, PCM C175B-14, circuit CDC15 (VT), harness side.
      • For 3.7L, PCM C1381B-14, circuit CDC15 (VT), harness side.
        Fig 3: Checking Generator Circuitry
        G07992402Courtesy of FORD MOTOR CO.
    • 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.
  7. E7 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 4: Connecting Fused Jumper Wire Between Generator C102A-1, Circuit CDC15 (VT) And Generator C102A-2
      G06065167Courtesy of FORD MOTOR CO.
    • Start the engine.
    • Monitor the GENMON_HZ PID.
    • Does the GENMON_HZ PID read between 120-130 Hz? 
  8. E8 CHECK THE PCM GENERATOR COMMAND LINE FAULT (GENCMD_LF) PID 
    • With the engine running and all selectable loads OFF, monitor the PCM PID GENCMD_LF.
    • Does the PCM PID GENCMD_LF fluctuate from YES FAULT to NO FAULT? 
    • Yes  : INSTALL a new generator. Refer to GENERATOR - 3.7L , GENERATOR - 5.0L  or GENERATOR - 5.8L (4V) . 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 the generator and High Current BJB 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.
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