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P0299-TURBOCHARGER UNDERBOOST CONDITION For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC CLOGGED AIR FILTER INTAKE AIR RESTRICTION INTAKE AIR LEAK BOOST PRESSURE SERVO MOTOR TURBOCHARGER Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. CHECK FOR ACTIVE DTC Turn the ignition on. With the scan tool, Clear DTCs in the Engine Control Module (ECM). Test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. CHECK THE AIR FILTER Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Were any of these problems found? Yes >> Replace the Air Filter element Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 3 3. CHECK FOR INTAKE SYSTEM RESTRICTIONS NOTE: Damaged, restricted or poorly connected intake and turbocharger related tubes can cause this DTC Inspect all air intake, crankcase vent and turbocharger related hoses/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 9 - 1344 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |