Dtc C15C7/78 Dc Motor Power Source Voltage

Steering. Land Cruiser. Urj200, 202 Grj200 Vdj200
Variable Gear Ratio Steering. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (PIG POWER SUPPLY VOLTAGE)

INSPECT VGRS ECU (STEERING CONTROL ECU) (PIG, PGND TERMINAL)

CHECK HARNESS AND CONNECTOR (PGND, PGD2 TERMINAL)

CHECK HARNESS AND CONNECTOR (PIG, PGND TERMINAL)

DTC C15C7/78 DC Motor Power Source Voltage

DTC C15C8/79 Power Supply Relay Failure


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
C15C7/78
Both conditions are met for approximately 2.4 seconds or more:
  1. The engine switch is on (IG).
  2. When the PIG voltage is 18.5 V or higher or 7 V or less, an open or short in the PIG circuit, or an internal malfunction in the ECU is detected.
  1. VGRS fuse
  2. Battery
  3. Charging system
  4. VGRS ECU (steering control ECU)
  5. Harness or connector
C15C8/79
All conditions are met for approximately 1.5 seconds or more:
  1. The engine switch is on (IG).
  2. Control has not started.
  3. An open / short in the PIG circuit or an internal malfunction in the ECU is detected.
  1. VGRS fuse
  2. Battery
  3. Charging system
  4. VGRS ECU (steering control ECU)
  5. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Variable Gear Ratio Steering.Variable Gear Ratio Steering System. Dtc C15C7/78 Dc Motor Power Source Voltage


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the VGRS ECU (steering control ECU), perform actuator angle neutral point calibration and initialization after replacement (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.READ VALUE USING GTS (PIG POWER SUPPLY VOLTAGE)

  1. Turn the engine switch off.

  1. Connect the GTS to the DLC3.

  1. Start the engine.

  1. Turn the GTS on.

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

    VGRS
    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
    		-


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)

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

  1. Turn the engine switch off.

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



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Variable Gear Ratio Steering.Variable Gear Ratio Steering System. Dtc C15C7/78 Dc Motor Power Source Voltage

  1. Disconnect the E159 VGRS ECU (steering control ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2 (PIG) - 1 (PGND)
    		Always
    		100 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (VGRS ECU [Steering Control ECU])
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE VGRS ECU (STEERING CONTROL ECU) (Click here)

C
REPLACE VGRS ECU (STEERING CONTROL ECU) (Click here)
A


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

  1. Turn the engine switch off.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Variable Gear Ratio Steering.Variable Gear Ratio Steering System. Dtc C15C7/78 Dc Motor Power Source Voltage

  1. Disconnect the E161 and E159 VGRS ECU (steering control ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E159-1 (PGND) - Body ground
    		Always
    		Below 1 Ω
    E161-13 (PGD2) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to VGRS ECU [Steering Control ECU])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Turn the engine switch off.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Variable Gear Ratio Steering.Variable Gear Ratio Steering System. Dtc C15C7/78 Dc Motor Power Source Voltage

  1. Disconnect the E159 VGRS ECU (steering control ECU) connector.

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

    HINT:
    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
    E159-2 (PIG) - E159-1 (PGND)
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to VGRS ECU [Steering Control ECU])
    Result
    Result
    		Proceed to
    The voltage is in the range of 11 to 14 V (for LHD)
    		A
    The voltage is in the range of 11 to 14 V (for RHD)
    		B
    The voltage is below 11 V
    		C
    The voltage is higher than 14 V
    		D


B
REPLACE VGRS ECU (STEERING CONTROL ECU) (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR

D
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY
A

REPLACE VGRS ECU (STEERING CONTROL ECU) (Click here)