POWER STEERING SYSTEM(for Power Tilt and Power Telescopic Steering Column) Power Steering Warning Light Circuit

DESCRIPTION

The power steering ECU is connected to the combination meter via CAN communication. If any of the following conditions are detected, the power steering warning light remains on.


WIRING DIAGRAM

B002JUCE05

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

Click here

Tech Tips

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION AND GROUND WIRE


    1. Check the connection condition of the ECU wire sub-assembly and power steering ECU assembly connectors.

      OK
      The ECU wire sub-assembly and power steering ECU assembly connectors are securely connected.

    2. Check that the ground wire is securely installed with the bolt.

      Click here

      OK
      The ground wire is securely installed with the bolt.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR OR INSTALL GROUND WIRE

    OK

  2. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      for LHD: Click here

      for RHD: Click here

      OK
      DTC is not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) for RHD: Click here

    OK

  3. READ VALUE USING GTS (IG POWER SUPPLY)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / EMPS / Data List.

    6. Select the item "IG power supply" in the Data List and read the value displayed on the GTS.


      Chassis > EMPS > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      IG Power Supply ECU power source voltage

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 Power switch on (IG): 8 to 16 V -

      Chassis > EMPS > Data List
      Tester Display
      IG Power Supply
      OK
      The normal condition value is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY) Click here

    OK

  4. READ VALUE USING GTS (PIG POWER SUPPLY)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / EMPS / Data List.

    6. Select the item "PIG Power Supply" in the Data List and read the value displayed on the GTS.


      Chassis > EMPS > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      PIG Power Supply Power source voltage to active motor

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 Always: 9 to 16 V -

      Chassis > EMPS > Data List
      Tester Display
      PIG Power Supply
      OK
      The normal condition value is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY) Click here

    OK

  5. CHECK COMBINATION METER ASSEMBLY


    1. Reconnect the n1 and n3 power steering ECU assembly connectors.

    2. Perform the Active Test of the combination meter assembly using the GTS.

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Indicat. EPS

    3. Check the combination meter assembly.

      OK
      The power steering warning light (red) turns on or off in accordance with the GTS operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    GO TO METER / GAUGE SYSTEM Click here

  6. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY)


    1. B002J8EC04
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

      Disconnect the nl1 ECU wire sub-assembly connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      nl1-5 (IG) - Body ground Power switch on (IG) 8 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK ECU WIRE SUB-ASSEMBLY


    1. B002KTNC02
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Connect the nl1 connector to the ECU wire sub-assembly.

    2. Disconnect the n2 and n1 power steering ECU assembly connectors.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      n2-1 (IG) - Body ground Power switch on (IG) 8 to 16 V

    5. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      n1-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY)


    1. B002IYIC07
      *a

      Front view of wire harness connector

      (to ECU Wire Sub-assembly)

      Disconnect the An1 ECU wire sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      An1-1 (PIG) - Body ground Always 9 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK ECU WIRE SUB-ASSEMBLY


    1. B002IU6C13
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Connect the An1 connector to the ECU wire sub-assembly.

    2. Disconnect the n1 power steering ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      n1-1 (PIG) - Body ground Always 9 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      n1-2 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Click here