VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15C6/77

DTC Code DTC Name
C15C6/77 IG Power Supply Voltage

DESCRIPTION

The VGRS ECU (steering control ECU) monitors the IG power supply voltage.

If the VGRS ECU (steering control ECU) detects a malfunction, it turns the master warning light on, and stores DTC C15C6/77.

DTC No. DTC Detection Condition Trouble Area
C15C6/77

Both conditions are met for approximately 3 seconds or more:


  • The engine switch is on (IG).

  • When the difference between the IG and PIG voltages is 4 V or more or the IG voltage is 18.5 V or higher, an open or short in the IG circuit or an internal malfunction in the ECU is detected.

  • ECU-IG NO. 1 fuse

  • Battery

  • Charging system

  • VGRS ECU (steering control ECU)

  • Harness or connector

WIRING DIAGRAM

B0018XEE06
*a from IG Circuit
*b ECU-IG NO.1
*c from Battery
*d VGRS ECU (Steering Control ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the VGRS ECU (steering control ECU), perform actuator angle neutral point calibration and initialization after replacement Click here.

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG, PGND TERMINAL)


    1. Turn the engine switch on (IG).

    2. B0018HPE02
      Text in Illustration
      *a

      Component with harness connected

      (VGRS ECU [Steering Control ECU])

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

      Tech Tips

      With the connector connected to the VGRS ECU (steering control ECU), measure the voltage from the rear of the connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E129-4 (IG) - E127-1 (PGND) Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      The voltage is in the range of 11 to 14 V A
      The voltage is below 11 V B
      The voltage is higher than 14 V C

      Tech Tips



    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

    A

  2. READ VALUE USING GTS (IG POWER SUPPLY VOLTAGE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

      VGRS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG Power Supply Voltage

      IG power supply voltage/

      Min.: 0.00 V

      Max.: 255.99 V

      		 11 to 14 V -
      OK
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE VGRS ECU (STEERING CONTROL ECU) Click here

    C

    REPLACE VGRS ECU (STEERING CONTROL ECU) Click here