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  • P1691 VP44 Controller Calibration Error

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    DTC P1691: FUEL INJECTOR PUMP CONTROLLER CALIBRATION

    Monitor & Set Conditions

    Fuel injection pump controller calibration is monitored with ignition on engine off and with engine running and no CAN BUS errors reported. DTC may be set when PCM fuel injector pump controller and ECM RPM are mismatched or fuel commanded does not equal amount fueled.

    Possible Causes

    • Fuel Injection Pump Failure
    • DTC Returns

    Testing

    1. Turn ignition on with engine off. Using DRBIII(R) scan tool, check for DTCs. If DTC P1691 does not exist, go to next step. If DTC P1691 exists, replace fuel injection pump. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.

    2. Using scan tool, clear DTCs. Start engine and allow engine to idle for one minute. Using scan tool, check for DTCs. If DTC P1691 does not exist, test is complete. If DTC P1691 exists, replace fuel injection pump. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.


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