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4. FUEL LEVEL SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE Disconnect the Cluster harness connector. Measure the resistance of each Fuel Level Signal circuit from the Fuel Pump Module harness connector to the Is the resistance below 5.0 ohms? Yes >> Go to 5 No >> Repair the Fuel Level Signal circuit for an open circuit or high resistance. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 5. (Z965) GROUND CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance between ground and the (Z965) Ground circuit in the Fuel Pump Module harness connector. Is the resistance below 5.0 ohms? Yes >> Go to 6 No >> Repair the (Z965) Ground circuit for an open circuit or high resistance. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 6. FUEL TANK AND SIPHON HOSE INSPECTION WARNING: The fuel system is under a constant pressure even with the engine off. Before opening the fuel - Siphon hose for restrictions or being disconnected. - Siphon Inlet and Outlet tube on the Fuel Modules for restrictions. - Fuel Pump Inlet Strainers for restrictions. - Fuel Tank for any obstructions or deformities. - Fuel Pump Module Float arm for damage. Were any problems found? Yes >> Repair or replace as necessary. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Replace the Fuel Level Sensor. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 679 |