ACTIVE HEIGHT CONTROL SUSPENSION ECU Power Source Circuit

DESCRIPTION

This circuit supplies the power source to the suspension control ECU.

WIRING DIAGRAM

B001B21E06

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Click here.

PROCEDURE


  1. READ VALUE USING GTS (IG POWER SOURCE VOLTAGE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG) and the GTS on.

    4. Enter the following menus: Chassis / AHC / Data List.

    5. According to the display on the GTS, read the Data List.

      AHC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG Power Source Voltage

      Power supply voltage /

      min.: 0 V

      max.: 255 V

      		 Engine switch on (IG): 11 to 14 V -
      OK
      11 to 14 V

    OK

    CHECK INDICATOR CIRCUIT Click here

    NG

  2. INSPECT FUSE (ECU-IG NO. 2)


    1. Remove the ECU-IG NO. 2 fuse from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-IG NO. 2 fuse Always Below 1 Ω

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - ECU) Click here

    OK

  3. INSPECT COWL SIDE JUNCTION BLOCK LH (IG1 NO. 1 RELAY)


    1. Disconnect the K30 ECU connector.

    2. B00184JE02
      *a Rear view of wire harness connector: (to Suspension Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K30-5 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - ECU AND BODY GROUND)

    B0018RLE03
    *a Rear view of wire harness connector: (to Suspension Control ECU)
    *b Front view of wire harness connector: (to Cowl Side Junction Block LH)

    1. Disconnect the K30 and K31 ECU connectors.

    2. Disconnect the 2K cowl side junction block LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K30-5 (IG) - 2K-29 Always Below 1 Ω
      K30-1 (GND) - Body ground Always Below 1 Ω
      K31-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (BATTERY - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the 2G cowl side junction block LH connector.

    2. B001B4BE05
      *1 Front view of wire harness connector: (to Cowl Side Junction Block LH)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2G-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - COWL SIDE JUNCTION BLOCK LH AND BODY GROUND)

    B001AJ7E03
    *1 Front view of wire harness connector: (to Cowl Side Junction Block LH)

    1. Disconnect the 2I and 2J cowl side junction block LH connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2I-18 - Body ground Engine switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      2J-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - ECU)


    1. Disconnect the K30 ECU connector.

    2. B00184JE02
      *a Rear view of wire harness connector: (to Suspension Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K30-5 (IG) - Body ground Always 10 kΩ or higher

      Tech Tips

      If a fuse is blown, replace the fuse.


    OK

    REPLACE COWL SIDE JUNCTION BLOCK LH

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR