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Diagnostic Procedure NHEC0915 1 CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. SEC502D OK or NG OK © GO TO 2. NG © Repair or replace. 2 CHECK FOR INTAKE AIR LEAK 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 CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. Refer to Wiring Diagram. MTBL1154 Continuity should exist. 5. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows. Refer to Wiring Diagram. MTBL1155 Continuity should not exist. 6. Also check harness for 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 AT AX SU BR ST RS BT HA SC EL IDX DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION Diagnostic Procedure EC-277 |