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Power Supply And Ground Circuit Check

  1. CHECK FUSE 

    Check for blown combination meter fuses.

    FUSE CHECK

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

    OK or NG 

    OK: GO TO 2.

    NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to "POWER SUPPLY ROUTING ".

  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) 

    CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS (QG18DE WITHOUT TACHOMETER)

    Terminals Ignition switch position
    (+) (-) OFF ACC ON
    Connector Terminal (Wire color)
    M30 25 (R/B) Ground Battery voltage Battery voltage Battery voltage
    26 (Y) 0V 0V Battery voltage
    M29 20 (Y) 0V 0V Battery voltage
    Fig 1: Checking Voltage Between Combination Meter Harness Connector Terminals And Ground
    G04195428Courtesy of NISSAN MOTOR CO., U.S.A.

    (QG18DE WITH TACHOMETER) 

    CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS (QG18DE WITH TACHOMETER)

    Terminals Ignition switch position
    (+) (-) OFF ACC ON
    Connector Terminal (Wire color)
    M30 42 (R/B) Ground Battery voltage Battery voltage Battery voltage
    41 (Y) 0V 0V Battery voltage
    M29 6(Y) 0V 0V Battery voltage
    Fig 2: Checking Voltage Between Combination Meter Harness Connector Terminals And Ground
    G04195429Courtesy of NISSAN MOTOR CO., U.S.A.

    (QR25DE) 

    CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS (QR25DE)

    Terminals Ignition switch position
    (+) (-) OFF ACC ON
    Connector Terminal (Wire color)
    M29 13 (R/B) Ground Battery voltage Battery voltage Battery voltage
    14(Y) 0V 0V Battery voltage
    7(Y) 0V 0V Battery voltage
    Fig 3: Checking Voltage Between Combination Meter Harness Connector Terminals And Ground
    G04195430Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Check the following.

    • Harness for open between combination meter and fuse
  3. CHECK GROUND CIRCUIT 

    Check continuity between combination meter harness connector terminals and ground.

    (QG18DE WITHOUT TACHOMETER) 

    CONNECTOR TERMINAL CONTINUITY SPECIFICATIONS (QG18DE WITHOUT TACHOMETER)

    Terminals Continuity
    (+) (-)
    Connector Terminal (Wire color)
    M30 27 (B) Ground Yes
    Fig 4: Checking Continuity Between Combination Meter Harness Connector Terminals And Ground
    G04195431Courtesy of NISSAN MOTOR CO., U.S.A.

    (QG18DE WITH TACHOMETER) 

    CONNECTOR TERMINAL CONTINUITY SPECIFICATIONS (QG18DE WITH TACHOMETER)

    Terminals Continuity
    (+) (-)
    Connector Terminal (Wire color)
    M30 48 (B) Ground Yes
    Fig 5: Checking Continuity Between Combination Meter Harness Connector Terminals And Ground
    G04195432Courtesy of NISSAN MOTOR CO., U.S.A.

    (QR25DE) 

    CONNECTOR TERMINAL CONTINUITY SPECIFICATIONS (QR25DE)

    Terminals Continuity
    (+) (-)
    Connector Terminal (Wire color)
    M29 12 (B) Ground Yes
    Fig 6: Checking Continuity Between Combination Meter Harness Connector Terminals And Ground
    G04195433Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Inspection End.

    NG: Repair harness or connector.

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