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3. (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY OUTPUT 2 Turn the ignition off. Measure the resistance between the (K31) Fuel Pump Relay Control Is the resistance above 10.0 ohms? Yes >> Go to 4 No >> Repair the (K31) Fuel Pump Relay Control circuit for a short to the (K343) Fused ASD Relay Output 2 circuit. Perform the ECM Verification Test Ver. 1. (Refer to 9 - 4. (K31) FUEL PUMP RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (K31) Fuel Pump Relay Control circuit Is the resistance below 10.0 ohms? Yes >> Go to 5 No >> Repair the (K31) Fuel Pump Relay Control circuit for an open circuit or high resistance. Perform the ECM Verification Test Ver. 1. (Refer to 9 - 5. FUEL PUMP RELAY Connect the Engine Control Module (ECM) connector. Install a known good relay in place of the vehicle’s Fuel Pump Relay. Turn the ignition on. With the scan tool, Clear DTCs. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Go to 6 No >> Replace the Fuel Pump Relay in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 9 - 1544 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |