ACTIVE HEIGHT CONTROL SUSPENSION ECU Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01583LE01

INSPECTION PROCEDURE

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

    NG

    INSPECT FUSE (ECU-IG NO. 4) Click here

    OK

    CHECK INDICATOR CIRCUIT Click here

  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. A0156K3E01

      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

    NG

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

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

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

    A015DBOE01

    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. A015CI9E08

      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. A015A7BE01

      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. A0156K3E01

      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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COWL SIDE JUNCTION BLOCK RH