VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15C7, C15C8

DTC Code DTC Name
C15C7 DC Motor Power Source Voltage
C15C8 DC Motor Power Source Voltage(ECU Start-up)

DESCRIPTION

The VGRS ECU (front steering control ECU) monitors terminal PIG (motor power source voltage) in order to detect malfunctions in the power supply relay (located inside the VGRS ECU (front steering control ECU)).

If the VGRS ECU (front steering control ECU) detects a malfunction, it turns the master warning light on, and stores these DTCs.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C15C7 DC Motor Power Source Voltage

All conditions are met:


  • The engine switch is on (IG).

  • When the PIG voltage is higher than 18.5 V or below 7 V, an open or short in the PIG circuit, or an internal malfunction in the ECU is detected for approximately 2.4 seconds or more.

  • VGRS fuse

  • Battery

  • Charging system

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
C15C8 DC Motor Power Source Voltage(ECU Start-up)

All conditions are met:


  • The engine switch is on (IG).

  • When the PIG voltage is higher than 18.5 V or below 4 V, an open or short in the PIG circuit, or an internal malfunction in the ECU is detected for approximately 1.5 seconds or more.

  • VGRS fuse

  • Battery

  • Charging system

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again
DTC Detection Conditions: C15C7
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition Engine switch is on (IG) ○ ○ ○ ○ ○
Malfunction Status PIG voltage is below 7 V ○ - - - -
PIG voltage is higher than 18.5 V - - - ○ -
An open in the PIG circuit - ○ - - -
A short in the PIG circuit - - - - ○
An internal malfunction in the ECU - - ○ - -
Detection Time Approximately 2.4 seconds or more Approximately 2.4 seconds or more Approximately 2.4 seconds or more Approximately 2.4 seconds or more Approximately 2.4 seconds or more
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C15C8
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition Engine switch is on (IG) ○ ○ ○ ○ ○
Malfunction Status PIG voltage is below 4 V ○ - - - -
PIG voltage is higher than 18.5 V - - - ○ -
An open in the PIG circuit - ○ - - -
A short in the PIG circuit - - - - ○
An internal malfunction in the ECU - - ○ - -
Detection Time Approximately 1.5 seconds or more Approximately 1.5 seconds or more Approximately 1.5 seconds or more Approximately 1.5 seconds or more Approximately 1.5 seconds or more
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B006EI3E14
*a from Battery
*b VGRS ECU (Front Steering Control ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the VGRS ECU (front 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. READ VALUE USING GTS (PIG POWER SUPPLY VOLTAGE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

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


      Chassis > VGRS > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      PIG Power Supply Voltage PIG power supply voltage

      Min.: 0.00 V

      Max.: 255.99 V

      		 11 to 14 V -

      Chassis > VGRS > Data List
      Tester Display
      PIG Power Supply Voltage
      OK
      11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. INSPECT VGRS ECU (FRONT STEERING CONTROL ECU) (PIG, PGND TERMINAL)


    1. Turn the engine switch off.

    2. Check the connection of the VGRS ECU (front steering control ECU) connector and the condition of the terminals.

    3. B0069LTC08
      *a

      Component without harness connected

      (VGRS ECU [Front Steering Control ECU])

      Disconnect the A20 VGRS ECU (front steering control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A20-2 (PIG) - A20-1 (PGND) Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PGND, PGD2 TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the G79 and A20 VGRS ECU (front steering control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A20-1 (PGND) - Body ground Always Below 1 Ω
      G79-13 (PGD2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (PIG, PGND TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the A20 VGRS ECU (front steering control ECU) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A20-2 (PIG) - A20-1 (PGND) Always 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

    A

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for V35A-FTS: Click here
    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 8GR-FKS: Click here