ACTIVE HEIGHT CONTROL SUSPENSION ECU Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01ESAVE02

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. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and the intelligent tester on.

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

    5. According to the display on the intelligent tester, 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

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


    1. Disconnect the K30 ECU connector.

    2. A01EQE6E02

      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

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

    A01EOHHE03

    1. Disconnect the K30 and K31 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
      K30-5 (IG) - 3C-5 Always Below 1 Ω
      K30-1 (GND) - Body ground Always Below 1 Ω
      K31-6 (GND) - Body ground Always Below 1 Ω

    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (BATTERY - COWL SIDE JUNCTION BLOCK RH)


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

    2. A01EN5XE08

      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
    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. A01EP22E01

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


    1. Disconnect the K30 ECU connector.

    2. A01EQE6E02

      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.


    NG
    OK