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6. CHECKING FOR AIR IN FUEL SYSTEM Start the engine. With the scan tool, compare the Fuel Pressure Setpoint with the Actual Fuel Pressure readings. NOTE: If there is air in the fuel system, the Actual Fuel Pressure will oscillate more than 100 psi above Does Actual Fuel Pressure oscillate more than 100 psi above and/or below the Fuel Pressure Setpoint? Yes >> Refer to the Service Information to purge air from the fuel system. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 7 7. FUEL PRESSURE SOLENOID Start the engine. With the scan tool, compare the Fuel Pressure Setpoint with the Actual Fuel Pressure readings. NOTE: A sticking Fuel Pressure Solenoid is indicated by Actual Fuel Pressure gradually dropping below the Does Actual Fuel Pressure gradually decrease then suddenly increase (spike) above the Fuel Pressure Yes >> Replace the Fuel Pressure Solenoid in accordance with the Service Information. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 8 8. CHECKING FUEL DELIVERY SYSTEM Refer to the appropriate Service Information and refer to Diagnosis and Testing Fuel Delivery System table. 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 9 9. FUEL INJECTOR(S) NOTE: An injector that sticks open can cause this DTC. A sticking injector will cause the engine to misfire Does the engine exhibit the symptoms described in the above note? Yes >> Using the Service Information, remove and inspect the Fuel Injectors for signs of damage or debris that may cause the injector to stick. Sticking injectors may cause the combustion chamber to become black Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 10 9 - 1302 ENGINE DIESEL DIAG KJ |