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3. FUEL INJECTOR CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect all of the Cylinder Fuel Injector harness connectors. Disconnect the ECM harness connectors. Remove the ASD Relay from the PDC. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 volt for any of the measurements? Yes >> Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 4 4. FUEL INJECTOR CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the ECM harness connectors. Disconnect all of the Fuel Injector harness connectors. Measure the resistance between ground and each Fuel Injector High-Side Control circuits. Measure the resistance between ground and each Fuel Injector Low-Side Control circuits. Is the resistance below 1000 ohms for any of the measurements? Yes >> Repair the Fuel Injector Control circuit for a short to ground. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 5 5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Turn the ignition off. Disconnect the ECM harness connectors. Disconnect all of the Cylinder Fuel Injector harness connectors. Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Is the resistance below 1000 ohms for any of the measurements? Yes >> Repair the Fuel Injector circuits that measured below 1000 ohms for a short together. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 6 6. FUEL INJECTOR CONTROL CIRCUIT OPEN Turn the ignition off. Disconnect the ECM harness connectors. Disconnect all of the Cylinder Fuel Injector harness connectors. Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector Is the resistance below 10.0 ohms for each measurement? Yes >> Go To 7 No >> Repair the appropriate Fuel Injector Control circuit for an open. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 9 - 822 ENGINE DIESEL DIAG KJ |