Dtc C1248/48 Open Circuit In Rear Differential Lock

Brake. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Brake Control Dynamic Control Systems. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK TERMINAL VOLTAGE (EXI2 TERMINAL)

RECONFIRM DTC

INSPECT REAR DIFFERENTIAL LOCK POSITION SWITCH

CHECK HARNESS AND CONNECTOR (EXI2 TERMINAL CIRCUIT)

DTC C1248/48 Open Circuit in Rear Differential Lock


DESCRIPTION

w/ Rear Differential Lock:
The skid control ECU (brake actuator assembly) monitors the rear differential lock position switch (No. 4 transfer indicator switch) and if the rear differential is locked, at which time the rear differential lock indicator light is illuminated, the skid control ECU (brake actuator assembly) prohibits the ABS.
At the same time, the skid control ECU (brake actuator assembly) illuminates the ABS warning light.

DTC Code
DTC Detection Condition
Trouble Area
C1248/48
At a vehicle speed of 50 km/h (31 mph) or more, 3 seconds or more elapse after the rear differential changes from free to lock.
HINT:
For vehicles without rear differential lock, this DTC may be stored due to an EXI2 terminal circuit malfunction.
  1. w/ Rear Differential Lock:
    1. Rear differential lock position switch (No. 4 transfer indicator switch)
    2. Differential lock system
  2. EXI2 terminal circuit
  3. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1248/48 Open Circuit In Rear Differential Lock


INSPECTION PROCEDURE

NOTICE:
  1. Before disconnecting the connector, make sure that there are no problems with the connection.
  2. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
1.CHECK TERMINAL VOLTAGE (EXI2 TERMINAL)

  1. w/ Rear Differential Lock:
    Set the vehicle to the rear differential free state.



    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1248/48 Open Circuit In Rear Differential Lock

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (brake actuator assembly) connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A13-22 (EXI2) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Brake Actuator Assembly])
    Result
    Result
    		Proceed to
    OK
    		A
    NG (w/ Rear Differential Lock)
    		B
    NG (w/o Rear Differential Lock)
    		C


B
Go to step 3

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A


2.RECONFIRM DTC

  1. Clear the DTC (HILUX_TGN26 RM000000XHV0CFX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. w/ Rear Differential Lock:
    Set the vehicle to the rear differential free state.

  1. Drive the vehicle at a speed of 50 km/h (31 mph) or more for 3 seconds or more.

  1. Check if the same DTC is output (HILUX_TGN26 RM000000XHV0CFX.html).

Result
Result
Proceed to
DTC output
A
DTC not output
B


B
USE SIMULATION METHOD TO CHECK (HILUX_TGN26 RM000004QR7008X.html)
A

REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K001NX.html)

3.INSPECT REAR DIFFERENTIAL LOCK POSITION SWITCH

  1. Turn the ignition switch off.

  1. Remove the rear differential lock position switch (No. 4 transfer indicator switch) (HILUX_TGN26 RM000003ARU004X.html).

  1. Inspect the rear differential lock position switch (No. 4 transfer indicator switch) (HILUX_TGN26 RM000001LZW015X_01_0008.html).



NG
REPLACE NO. 4 TRANSFER INDICATOR SWITCH (HILUX_TGN26 RM000003ARU004X.html)
OK


4.CHECK HARNESS AND CONNECTOR (EXI2 TERMINAL CIRCUIT)

  1. Turn the ignition switch off.

  1. Disconnect the rear differential lock position switch (No. 4 transfer indicator switch) connector.

  1. Disconnect the rear differential lock ECU (No. 2 4 wheel drive control ECU) connector.

  1. Disconnect the skid control ECU (brake actuator assembly) connector.

  1. Disconnect the G20 combination meter connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A13-22 (EXI2) - L8-2
    		Always
    		Below 1 Ω
    A13-22 (EXI2) - G20-9 (L)
    		Always
    		Below 1 Ω
    A13-22 (EXI2) - K28-1 (RLP)
    		Always
    		Below 1 Ω
    A13-22 (EXI2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO DIFFERENTIAL SYSTEM (PROBLEM SYMPTOMS TABLE) (HILUX_TGN26 RM000002M7700GX.html)