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Pinpoint Test B: Ignition Power Circuit Tests

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1: CHECK FOR IGNITION POWER AT GENERATOR 
    1. Set ignition status to OFF.
    2. Disconnect generator electrical connector PI048.
    3. Set ignition status to ON.
    4. Measure the voltage at generator electrical connector PI048 pin 2.

    Is the voltage greater than 10 volts? 

    YES:  Check for quiescent current fault, check battery condition. Refer to the Battery Care Manual.

    NO:  Go to B 2.

  2. B2: CHECK THE IGNITION POWER CIRCUIT FOR SHORT TO GROUND 
    1. Set the ignition status to OFF.
    2. Disconnect the battery.
    3. Check the resistance between generator electrical connector PI048 pin 2 and GROUND.

    Is the resistance less than 400 ohms? 

    YES:  REPAIR the circuit between the generator electrical connector PI048 pin 2 and the CJB. CLEAR the DTC, test the system for normal operation.

    NO:  Go to B 3.

  3. B3: CHECK THE IGNITION POWER CIRCUIT FOR SHORT TO POWER 
    1. Check the resistance between generator electrical connector PI048 pin 2 and battery positive.

    Is the resistance less than 10, 000 ohms? 

    YES:  REPAIR the circuit between the generator electrical connector PI048 pin 2 and the CJB. CLEAR the DTC, test the system for normal operation.

    NO:  Go to B 4.

  4. B4: CHECK THE IGNITION POWER CIRCUIT FOR OPEN CIRCUIT 
    1. Disconnect CJB electrical connector FL048.
    2. Check the resistance between CJB electrical connector FL048 pin 12 and generator electrical connector PI048 pin 2.

    Is the resistance greater than 5 ohms? 

    YES:  REPAIR the circuit between CJB electrical connector FL048 pin 12 and generator electrical connector PI048 pin 2. CLEAR the DTC, test the system for normal operation.

    NO:  Go to B 5.

  5. B5: CHECK CJB IGNITION POWER OUTPUT DRIVE 
    1. Connect the battery.
    2. Set ignition status to ON.
    3. Check the voltage at CJB electrical connector FL048, component side, pin 12.

    Is the voltage greater than 10 volts? 

    YES:  Check no other modules connected to this circuit are pulling to GROUND. Clear the DTC, test the system for normal operation.

    NO:  Install a new generator. Refer to Generator - Vehicles Without: Supercharger information.

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