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Diagnostic Procedure NHEC0919 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 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. MTBL1156 Continuity should exist. 5. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows. Refer to Wiring Diagram. MTBL1157 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 P0172, P0175 FUEL INJECTION SYSTEM FUNCTION Diagnostic Procedure EC-285 |