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P0148-HIGH PRESSURE COMMON RAIL (HPCR) CHECKSUM (CONTINUED) 8. FUEL RETURN LINE OBSTRUCTION, DAMAGED OR DEBRIS Check the fuel return lines for signs of obstruction, damage, or debris. Are the fuel drain lines damaged or blocked? Yes >> Repair cause of high fuel drain line restriction. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- No >> Go To 9 9. LIFT PUMP FLOW Perform the no trouble code 9 Lift Pump flow test 9 . (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) Did the Lift pump pass the test? Yes >> Go To 10 No >> Replace the Lift Pump. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 10. PRESSURE LIMITING VALVE Perform the no trouble code test 9 Pressure Limiting Valve on the Fuel Rail for internal leaks 9 . Did the pressure limiting valve pass the test procedure? Yes >> Go To 11 No >> Replace the Pressure Limiting Valve. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 11. LEAKING FUEL INJECTORS OR HIGH PRESSURE CONNECTORS Perform the no trouble test 9 *Injector return flow test 9 . (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) Are any Injectors leaking or high pressure connectors leaking? Yes >> Replace or repair the leaking fuel injectors or high pressure connectors. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- No >> Go To 12 12. HIGH PRESSURE FUEL PUMP Perform the no trouble code test 9 HIGH PRESSURE FUEL PUMP PERFORMANCE TEST 9 . (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) Did the fuel pump pass the high pressure fuel pump performance test? Yes >> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Replace the High pressure fuel pump. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 9 - 1118 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |