METER / GAUGE SYSTEM Entire Combination Meter does not Operate

DESCRIPTION

This circuit is the power source circuit for the No. 1 meter ECU. 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 of the meter CPU, however, it is also used for communication. If a voltage of 12 V is not applied to terminal IG2 when the power switch is on (IG), the indicator will not operate.

WIRING DIAGRAM

A01H22IE09

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (D MPX-B 2, P-J/B)


    1. Remove the D MPX-B 2 fuse from the main body ECU.

    2. Remove the P-J/B fuse from the engine room No. 2 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D MPX-B 2 fuse Always Below 1 Ω
      P-J/B fuse

    NG

    REPLACE FUSE

    OK

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


    1. A01GWNHE03

      Disconnect the L124 meter connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L124-17 (E2) - Body ground Always Below 1 Ω
      L124-18 (ES) - Body ground
      Standard voltage
      Tester Connection Condition Specified Condition
      L124-14 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      L124-13 (B) - Body ground Always

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 METER ECU Click here