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3. CHECKING THE SUPPLY SIDE FUEL DELIVERY SYSTEM Refer to the appropriate Service Information and test for proper Fuel pressure and volume from the fuel tank to the NOTE: The following is a list of problems that can cause fuel pressure to deviate from specification: Were there any problems with the Fuel Delivery System? Yes >> Repair as necessary in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go To 4 4. ENGINE COMPRESSION Ignition on, engine off. Refer to the Service Information and perform the Cylinder Compression Test. Is the cylinder compression within specification for all cylinders? Yes >> Go To 5 No >> Repair as necessary in accordance with the Service Information. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 5. FUEL INJECTOR CIRCUIT RESISTANCE Turn the ignition off. Disconnect the ECM harness connectors. Disconnect each Fuel Injector harness connector. Measure the resistance of each of the Fuel Injector Control circuits between the Fuel Injector and ECM harness Is the resistance below 10.0 ohms for each measurement? Yes >> Replace the Fuel Injector(s) as necessary. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Repair the Fuel Injector circuit(s) that measured above 10.0 ohms for an open. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1051 |