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• When Monitored: • Set Condition: Possible Causes AIR FILTER AIR RESTRICTION AIR LEAKS BOOST CONTROL VACUUM SUPPLY BOOST PRESSURE ACTUATOR TURBOCHARGER Diagnostic Test 1. CHECK FOR ACTIVE DTC NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may NOTE: Ensure all turbocharger inlet and outlet tubes are connected properly, without damage and restric- NOTE: If DTC P0401 or P0402 is present with this DTC, diagnose P0401 or P0402 before diagnosing this With the scan tool, erase ECM DTCs. Test drive the vehicle. Monitor the scan tool for ECM DTCs. NOTE: A clogged Boost Pressure Solenoid Air Filter can cause this DTC to set. Inspect this filter and Did this DTC set again? Yes >> Go To 2 No >> Test Complete. 2. 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 9 - 858 ENGINE DIESEL DIAG KJ |