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3. AIR RESTRICTION NOTE: Inspect all air intake, crankcase vent and turbocharger related tubes for damage, restriction or poor NOTE: Inspect the exhaust system and related tubes for damage, restriction or poor connection. Any of Inspect the intake system, exhaust system and related tubes and connections. Were any problems found? Yes >> Repair or replace as necessary. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 4 4. CHECKING FOR AIR LEAKS Turn the ignition off. Remove the Inlet Pressure Sensor. Connect smoke machine 84-04 to the Inlet Pressure Sensor port in the intake duct and begin injecting smoke into Observe all intake system components for evidence of smoke leakage. Is there evidence of smoke leakage? Yes >> Repair or replace as necessary. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 5 5. EGR VALVE Turn the ignition off. NOTE: An EGR Valve that is stuck partially open can cause this DTC to set. Hard starting, rough running Does the vehicle exhibit these conditions? Yes >> Replace the EGR Valve. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Replace the MAF Sensor. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 9 - 758 ENGINE DIESEL DIAG KJ |