LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> Ignition Signal >> Diagnostic Procedure >> 4. Check Ignition Coil Power Supply Circuit-I
April 5, 2026: LEMON Manuals is launched! Read the announcement.

4. Check Ignition Coil Power Supply Circuit-I

  1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
  2. Check voltage between ECM terminals 163, 166 and ground with CONSULT-II or tester.
    1. Voltage: Battery voltage 
Fig 1: Checking voltage between ECM terminals 163, 166 & ground
G00761348Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 5.

NG: Go to POWER SUPPLY AND GROUND CIRCUIT  .