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Power Supply And Ground Circuit Check

  1. CHECK FUSE 

    Check for blown combination meter fuses.

    CHECK FOR BLOWN COMBINATION METER FUSES

    Unit Power source Fuse No.
    Combination meter Battery 12
    Combination meter Ignition switch ON or START 30

    OK or NG 

    1. OK: GO TO 2.
    2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to POWER DISTRIBUTION .
  2. CHECK POWER SUPPLY CIRCUIT 
    1. Disconnect combination meter connector M29 (QR25DE) or M29 and M30 for (QG18DE).
    2. Check voltage between combination meter harness connector terminals and ground.

    (QG18DE WITHOUT TACHOMETER) 

    IGNITION TERMINAL POSITION

    Terminals Ignition switch position
    (+) (-) OFF ACC ON
    Connector Terminal (Wire color)
    M30 25 (R/B> Ground Battery voltage Battery voltage Battery voltage
    26 (Y) OV OV Battery voltage
    M29 20 (Y) OV OV Battery voltage
    Fig 1: Checking Power Supply Circuit
    G03511079Courtesy of NISSAN MOTOR CO., U.S.A.

    (QG18DE WITH TACHOMETER) 

    IGNITION TERMINAL POSITION

    Terminals Ignition switch position
    (+) (-) OFF ACC on
    Connector Terminal (Wire color)
    M30 42 (R/B) Ground Battery voltage Battery voltage Battery voltage
    41 (Y) OV OV Battery voltage
    M29 6 (Y) OV OV Battery voltage
    Fig 2: Identifying (QG18DE With Tachometer)
    G03511080Courtesy of NISSAN MOTOR CO., U.S.A.

    (QR25DE) 

    IGNITION TERMINAL POSITION

    Terminals Ignition switch position
    (+) (-) OFF ACC ON
    Connector Terminal (Wire color)
    M29 13(R/B) Ground Battery voltage Battery voltage Battery voltage
    14(Y) OV OV Battery voltage
    7(Y) OV OV Battery voltage

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Check the following.
      • Harness for open or short between combination meter and fuse
    Fig 3: Identifying Harness For Open Or Short Between Combination Meter And Fuse
    G03511081Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK GROUND CIRCUIT 

    Check continuity between combination meter harness connector terminals and ground.

    (QG18DE WITHOUT TACHOMETER) 

    TERMINAL CONTINUITY

    Terminals Continuity
    (+) (-)
    Connector Terminal (Wire color)
    M30 27(B) Ground
    Fig 4: Identifying Ground Circuit
    G03511082Courtesy of NISSAN MOTOR CO., U.S.A.

    (QG18DE WITH TACHOMETER) 

    TERMINAL CONTINUITY

    Terminals Continuity
    (+) (-)
    Connector Terminal(Wire color)
    M30 48 (B) Ground

    (QR25DE) 

    Fig 5: Identifying Terminal (Wire Color)
    G03511083Courtesy of NISSAN MOTOR CO., U.S.A.
    TERMINAL CONTINUITY

    Terminals Continuity
    (+) (-)
    Connector Terminal (Wire color)
    M29 12 (B) Ground

    OK or NG 

    1. OK: INSPECTION END
    2. NG: Repair harness or connector.
    Fig 6: Identifying Combination Meter Connector
    G03511084Courtesy of NISSAN MOTOR CO., U.S.A.
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