Dtc C15C7/78 Dc Motor Power Source Voltage Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

RECONFIRM DTC OUTPUT

DTC C15C7/78 DC Motor Power Source Voltage Malfunction

DTC C15C8/79 Power Supply Relay Failure


DESCRIPTION

The steering control ECU monitors PIG (motor power source voltage) and detects a malfunction in the power supply relay (located inside the steering control ECU).
If the steering control ECU detects a malfunction, it will turn on the master warning light, store these DTCs, and stop VGRS operation.

DTC Code
DTC Detection Condition
Trouble Area
C15C7/78
The steering control ECU detects that the IG terminal voltage is between 9 and 16 V, and the PIG terminal voltage is below 7 V or higher than 18.5 V for 2.4 seconds.
  1. Harness or connector
  2. Steering control ECU
C15C8/79
The steering control ECU detects a malfunction in the power source relay or an open circuit.
  1. Harness or connector
  2. Steering control ECU

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 Malfunction


INSPECTION PROCEDURE

HINT:
The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.
1.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

  1. Record and clear the DTCs (Click here).



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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E77-7 (PGND) - Body ground
    		Always
    		Below 1 Ω
    E78-8 (PGD2) - Body ground
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E77-8 (PIG) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.RECONFIRM DTC OUTPUT

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    C15C7/78 or C15C8/79 is not output
    		A
    C15C7/78 or C15C8/79 is output (for LHD)
    		B
    C15C7/78 or C15C8/79 is output (for RHD)
    		C


B
REPLACE STEERING CONTROL ECU (Click here)

C
REPLACE STEERING CONTROL ECU (Click here)
A

USE SIMULATION METHOD TO CHECK (Click here)