ACTIVE HEIGHT CONTROL SUSPENSION ECU Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

B001WB8E03

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 INTELLIGENT TESTER (IG POWER SOURCE VOLTAGE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and the tester on.

    3. Read the "IG Power Source Voltage" item in 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. 4)


    1. Remove the ECU-IG No. 4 fuse from the cowl side junction block RH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-IG No. 4 fuse Always Below 1 Ω

    NG

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

    OK

  3. INSPECT COWL SIDE JUNCTION BLOCK RH (IG NO. 4 RELAY)


    1. Disconnect the K34 ECU connector.

    2. B001YMLE02
      *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
      K34-5 (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 RH - ECU AND BODY GROUND)

    B001WYRE01
    *a Rear view of wire harness connector: (to Suspension Control ECU)
    *b Front view of wire harness connector: (to Cowl Side Junction Block RH)

    1. Disconnect the K34 and K35 ECU connectors.

    2. Disconnect the 3C cowl side junction block RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K34-5 (IG) - 3C-5 Always Below 1 Ω
      K34-1 (GND) - Body ground Always Below 1 Ω
      K35-6 (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 RH)


    1. Disconnect the 3A cowl side junction block RH connector.

    2. B001Y9JE01
      *1 Front view of wire harness connector: (to Cowl Side Junction Block RH)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3A-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 RH AND BODY GROUND)


    1. Disconnect the 3C cowl side junction block RH connector.

    2. B001W9BE01
      *1 Front view of wire harness connector: (to Cowl Side Junction Block RH)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3C-22 - Body ground Engine switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-8 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the K34 ECU connector.

    2. B001YMLE02
      *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
      K34-5 (IG) - Body ground Always 10 kΩ or higher

      Tech Tips

      If a fuse is blown, replace the fuse.


    OK

    REPLACE COWL SIDE JUNCTION BLOCK RH

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR