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EC-646 [QG (WITHOUT EURO-OBD)] POWER SUPPLY CIRCUIT FOR ECM Specification data are reference values and are measured between each terminal and ground. CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam- Diagnostic Procedure EBS00QVP 1. INSPECTION START Start engine. Yes or No Yes >> GO TO 10. No >> GO TO 2. 2. CHECK ECM POWER SUPPLY CIRCUIT-I 1. Turn ignition switch “OFF” and then “ON”. 2. Check voltage between ECM terminal 109 and ground with OK or NG OK >> GO TO 4. NG >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. ● Fuse block (J/B) connector M1 ● 10A fuse ● Harness for open or short between ECM and fuse >> Repair open circuit or short to ground or short to power in harness or connectors. TER- MINAL NO. WIRE COLOR ITEM CONDITION DATA (DC Voltage) 1 B ECM ground [Engine is running] ● Idle speed Engine ground 109 B/R Ignition switch [Ignition switch “OFF”] 0V [Ignition switch “ON”] BATTERY VOLTAGE 111 W/G ECM relay [Engine is running] ● For a few seconds after turning ignition switch 0 - 1.0V [Ignition switch “OFF”] ● More than a few seconds passed after turning BATTERY VOLTAGE 115 B ECM ground [Engine is running] ● Idle speed Engine ground 119 120 W Power supply for [Ignition switch “ON”] BATTERY VOLTAGE Voltage: Battery voltage MBIB0015E |