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EC-650 [QG (WITHOUT EURO-OBD)] POWER SUPPLY CIRCUIT FOR ECM 15. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II 1. Turn ignition switch “OFF”. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminals 1, 115, 116 and engine ground. 4. Also check harness for short to power. OK or NG OK >> GO TO 17. NG >> GO TO 16. 16. DETECT MALFUNCTIONING PART Check the following ● Harness connectors M71, F45 ● Harness for open or short between ECM and engine ground >> Repair open circuit or short to power in harness or connectors. 17. CHECK INTERMITTENT INCIDENT Refer to EC-644, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END Component Inspection EBS00QVQ ECM RELAY 1. Apply 12V direct current between ECM relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5, 6 and 7. 3. If NG, replace ECM relay. Continuity should exist. Condition Continuity 12V direct current supply Yes OFF No PBIB0077E |