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Diagnostic Procedure NCEC0191 1 CHECK EXHAUST AIR LEAK 1. Start engine and run it at idle. SEF099P OK or NG OK © GO TO 2. NG © Repair or replace. 2 CHECK FOR INTAKE AIR LEAK AND PCV HOSE 1. Listen for an intake air leak after the mass air flow sensor. OK or NG OK © GO TO 3. NG © Repair or replace. 3 CHECK HEATED OXYGEN SENSOR 1 (FRONT) CIRCUIT 1. Turn ignition switch “OFF”. SEF917Z 3. Check harness continuity between ECM terminal 62 and HO2S1 terminal 2. Refer to Wiring Diagram. Continuity should exist. 4. Check harness continuity between ECM terminal 62 (or HO2S1 terminal 2) and ground. Refer to Wiring Diagram. Continuity should not exist. 5. Also check harness for short to ground and short to power. OK or NG OK © GO TO 4. NG © Repair open circuit or short to ground or short to power in harness or connectors. GI MA EM LC FE CL MT AT AX SU BR ST RS BT HA SC EL IDX DTC P0171 FUEL INJECTION SYSTEM FUNCTION (LEAN SIDE) Diagnostic Procedure EC-275 |