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P0251-CP3 PUMP REGULATOR CONTROL (CONTINUED) For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes FUEL PUMP (K181) FUEL CONTROL ACTUATOR DRIVER OPEN (K31) RETURN CIRCUIT OPEN FROM FCA TO ECM (K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO EXTERNAL VOLTAGE (K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO EXTERNAL VOLTAGE (K31) FCA RETURN CIRCUIT SHORTED TO (K181) FCA DRIVER CIRCUIT (K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO GROUND (K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT (K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT INTERMITTENT CONDITION ECM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. FUEL PUMP Ignition on, engine not running. Disconnect the Fuel Control Actuator (FCA) harness connector. Connect an incandescent test light across the Fuel Control Actuator Observe the test light. The ECM will perform a self test of the circuit which should momen- NOTE: Check connectors - Clean/repair as necessary. NOTE: Compare test light brightness to that of a direct connec- Did the light flash brightly? Yes >> Replace the Fuel Pump. Perform POWERTRAIN VERIFICATION TEST VER - 1 No >> Go To 2 9 - 1186 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |