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4 CHECK POWER SUPPLY 1. Disconnect mass air flow sensor harness connector. SEC378C 2. Turn ignition switch “ON”. SEC408C OK or NG OK © GO TO 6. NG © GO TO 5. 5 DETECT MALFUNCTIONING PART Check the following. I Harness for open or short between ECM relay and mass air flow sensor I Harness for open or short between mass air flow sensor and ECM © Repair harness or connectors. 6 CHECK GROUND CIRCUIT 1. Turn ignition switch “OFF”. Refer to wiring diagram. Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG OK © GO TO 7. NG © Repair open circuit or short to ground or short to power in harness or connectors. GI MA EM LC FE CL MT AT PD AX SU BR ST RS BT HA SC EL IDX DTC 0102 MASS AIR FLOW SENSOR (MAFS) Diagnostic Procedure (Cont’d) EC-103 |