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Home >> Infiniti >> 2003 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0650: Mil Control Circuit >> Diagnostic Procedure
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Diagnostic Procedure

  1. Turn ignition off. Disconnect instrument cluster harness connectors. Turn ignition on. Measure voltage between ground and Orange wire at instrument cluster harness connector terminal No. 24. See Figure . If battery voltage exists, go to step  3 . If battery voltage does not exist, go to next step.
  2. Check the following:
    • Check fuse No. 30 (10-amp) located in fuse block under left side of instrument panel.
    • Check for poor connection at fuse block connector M19 terminal 1L (Orange wire). See Figure .
    • Check for open or short in Green wire between fuse block and instrument cluster.
    Repair as necessary.
  3. Turn ignition off. Disconnect ECM harness connector. See Figure . Check continuity of Light Green/Black wire between instrument cluster harness connector terminal No. 45 and ECM harness connector terminal No. 33. See Figure . Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If circuit is okay, go to step  5 .
  4. Check the following:
    • Check for poor connection at White, 18-pin harness connector F66 terminal No. 5 (Light Green/Black wire). See Figure . Connector is located under instrument panel. See Figure .
    • Check for open or short between instrument cluster and ECM.
    Repair as necessary.
  5. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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