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TROUBLE DIAGNOSIS FOR POWER SUPPLY; Main Power Supply and Ground Circuit (Cont'd); Diagnostic Procedure Steps 11-15

EF & EC-7075prose procedure
Continued from EF & EC-7074

Main Power Supply and Ground Circuit (Cont'd)

CG10, CGA3

Step 11 — CHECK OUTPUT SIGNAL CIRCUIT

  1. 1
    Check harness continuity between ECM terminal 27 and relay terminal 2. Refer to wiring diagram. Continuity should exist.
  2. 2
    Also check harness for short to ground and short to power.
  3. 3
    OK or NG: - OK → GO TO 13. - NG → GO TO 12.

Step 12 — DETECT MALFUNCTIONING PART

  1. 1
    Check the following: - Harness connectors F32, E67 - Harness for open or short between ECM relay and ECM
  2. 2
    → Repair open circuit or short to ground or short to power in harness or connectors.

Step 13 — CHECK ECM RELAY

  1. 1
    Apply 12V direct current between relay terminals 1 and 2.
  2. 2
    Check continuity between relay terminals 3 and 5, 6 and 7. (See SEF497Y)
  3. 3
    Expected: - 12V (1 - 2) applied: Continuity exists. - No voltage applied: No continuity.
  4. 4
    OK or NG: - OK → GO TO 14. - NG → Replace ECM relay.

Step 14 — CHECK GROUND CIRCUIT

  1. 1
    Turn ignition switch "OFF".
  2. 2
    Disconnect ECM harness connector.
  3. 3
    Check harness continuity between ECM terminals 6, 28, 34, 55 and engine ground. Refer to wiring diagram. Continuity should exist.
  4. 4
    Also check harness for short to ground and short to power.
  5. 5
    OK or NG: - OK → GO TO 15. - NG → Repair open circuit or short to ground or short to power in harness or connectors.

Step 15 — CHECK INTERMITTENT INCIDENT

  1. 1
    Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT", EC-7070.
  2. 2
    → INSPECTION END.
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See also

EC-7070

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