METER / GAUGE SYSTEM Entire Combination Meter does not Operate

DESCRIPTION

This circuit is the power source circuit for the combination meter. This circuit provides 2 power source types: one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission. The constant power source is mainly used as a backup power source for the meter CPU. However, it is also used for communication. If a voltage of 12 V is not applied to terminal IG+ when the engine switch is on (IG), indicators will not operate.

WIRING DIAGRAM

B001AD2E01

PROCEDURE


  1. INSPECT FUSE (METER, MPX-B NO. 2)


    1. Remove the METER and MPX-B NO. 2 fuses from the engine room relay block.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      METER fuse Always Below 1 Ω
      MPX-B NO. 2 fuse

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND)

    B001AZIE01

    1. Disconnect the E120 meter connector.

    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E120-20 (ET) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E120-21 (B) - Body ground Always 11 to 14 V
      E120-22 (IG+) - Body ground Engine switch on (IG)

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR