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Possible Causes ENGINE CONTROL MODULE INTERMITTENT CONDITION FUEL INJECTOR CONTROL CIRCUIT SHORTED TO VOLTAGE FUEL INJECTOR CONTROL CIRCUIT SHORTED TO GROUND FUEL INJECTOR CIRCUITS SHORTED TOGETHER FUEL INJECTOR CONTROL CIRCUIT OPEN FUEL INJECTOR Diagnostic Test 1. VERIFY ACTIVE DTC NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may With the scan tool, erase the ECM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the ECM DTCs. Did this DTC set again? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the ECM will cause multiple DTC’s including this DTC to set. NOTE: Check the ECM for other DTC’s. If other DTC’s are set with this DTC refer to the symptom list and If the ECM power and ground circuits are functioning properly continue with this test. Yes >> Go To 3 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 9 - 846 ENGINE DIESEL DIAG KJ |