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MAIN POWER SUPPLY AND GROUND CIRCUIT
EC-941
[YD (WITH EURO-OBD)]
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EC
8. CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 105, 113 and ECM relay terminal 2. Refer to Wiring
Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9. DETECT MALFUNCTIONING PART
Check the following.
● Harness connectors F30, M63
● Harness for open or short between ECM and ECM relay.
>> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Check harness continuity between ECM terminal 119 and ECM relay terminal 5, ECM terminal 120 and
ECM relay terminal 7. Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following.
● Harness connectors F30, M63
● Harness for open or short between ECM and ECM relay.
>> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK ECM RELAY
Refer to EC-942, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace ECM relay.
Continuity should exist.
Continuity should exist.
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