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

DTC Code DTC Name
C15C6/77 IG Power Supply Voltage

DESCRIPTION

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

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

DTC Code 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 IG voltage is 4 V or less or 18.5 V or higher, an open or short in the IG circuit or an internal malfunction in the ECU is detected.

  • RH ECU-IG fuse (for LHD)

  • LH ECU-IG fuse (for RHD)

  • Battery

  • Charging system

  • VGRS ECU (front steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A01FGNTE02

INSPECTION PROCEDURE

Note


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

  • Since DTC C1B09/19 is stored in the DRS ECU (rear steering control ECU), after performing repairs on the VGRS system, clear the DTCs for the dynamic rear steering system.

  • 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. Start the engine.

    2. A01FF97E04
      Text in Illustration
      *a

      Component with harness connected

      (VGRS ECU [Front 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 (front steering control ECU), measure the voltage from the rear of the connector.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N104-4 (IG) - A31-1 (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

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    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

    NG

    REPLACE FRONT STEERING CONTROL ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here