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P0628-LOW VOLTAGE DETECTED AT THE FUEL LIFT PUMP (CONTINUED) 7. FUEL LIFT PUMP RELAY DRIVER CIRCUIT SHORTED TO OTHER CIRCUITS Measure the resistance between the lift pump relay driver circuit in the Is the resistance less than 10 Ohms? Yes >> Repair the Fuel lift pump Relay driver circuit shorted to another circuit. Perform POWERTRAIN VERIFICATION TEST VER - 1 No >> Go To 8 8. ECM Reconnect the ECM connectors. Turn the ignition on, engine off. Connect one end of an incandescent test light to battery negative. Connect the other end of the test light to the relay driver pin in the PDC. Using the scan tool, actuate the lift pump. Does the test light illuminate brightly? Yes >> Repair complete. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- No >> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 9 - 1354 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |