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DIAGNOSTIC PROCEDURE NHEC0049 1 INSPECTION START Start engine. Yes or No Yes © GO TO 9. No © GO TO 2. 2 CHECK ECM POWER SUPPLY CIRCUIT-I 1. Turn ignition switch “OFF” and then “ON”. SEF291X OK or NG OK © GO TO 4. NG © GO TO 3. 3 DETECT MALFUNCTIONING PART Check the following. I Harness connectors M46, F44 I Fuse block (J/B) connector M19, E89 I 10A fuse I Harness for open or short between ECM and ignition switch © Repair harness or connectors. 4 CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I 1. Turn ignition switch “OFF”. Refer to WIRING DIAGRAM. Continuity should exist. 4. Also check harness for short to power. OK or NG OK © GO TO 5. NG © Repair open circuit or short to power in harness or connectors. GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX TROUBLE DIAGNOSIS FOR POWER SUPPLY Main Power Supply and Ground Circuit (Cont’d) EC-147 |