Brake Control Dynamic Control Systems. Dtc C1268 Transfer L4 Position Switch Circuit

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 (EXI4 TERMINAL)

RECONFIRM DTC

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - L4 POSITION SWITCH)

INSPECT L4 POSITION SWITCH

CHECK TERMINAL VOLTAGE (L4 POSITION SWITCH POWER SOURCE CIRCUIT)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TRANSMISSION CONTROL ECU)

DTC C1268 Transfer L4 Position Switch Circuit

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
C1268	No signal is input to the EXI4 terminal of the skid control ECU.	L4 position switch (No. 1 transfer indicator switch) L4 position switch circuit Skid control ECU (Brake actuator assembly) Transmission control ECU assembly (for Automatic Transmission)

WIRING DIAGRAM

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Brake Control Dynamic Control Systems.Anti-Lock Brake System.
Dtc
C1268 Transfer L4 Position Switch Circuit

INSPECTION PROCEDURE

NOTICE:

After replacing the brake actuator assembly, perform calibration (HILUX_TGN26 RM000000XHR073X.html).
Before disconnecting the connector, make sure that there are no problems with the connection.
After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.

1.CHECK TERMINAL VOLTAGE (EXI4 TERMINAL)

Connect the skid control ECU (brake actuator assembly) connector.

Set the vehicle to the L4 state using the transfer shift lever.

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

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
A36-9 (EXI4) - Body ground
Ignition switch ON
Transfer shift position L4
Below 1.5 V

Connect the skid control ECU (brake actuator assembly) connector.

Set the vehicle to the H4 or H2 state using the transfer shift lever.

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

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
A36-9 (EXI4) - Body ground
Ignition switch ON
Transfer shift position not L4
11 to 14 V

Text in Illustration
*a	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

Go to step 3

OK

2.RECONFIRM DTC

Clear the DTC (HILUX_TGN26 RM000000XHV0CGX.html).

Turn the ignition switch off.

Check if the same DTC is output.
Result
Result
Proceed to
DTC is output
A
DTC is not output
B

Result
Result	Proceed to
DTC is output	A
DTC is not output	B

USE SIMULATION METHOD TO CHECK (HILUX_TGN26 RM000004QR7002X.html)

REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K000WX.html)

3.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - L4 POSITION SWITCH)

Turn the ignition switch off.

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

for Automatic Transmission:
Disconnect the G40 transmission control ECU connector.

Disconnect the L4 position switch (No. 1 transfer indicator switch) connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A36-9 (EXI4) - C29-1
Always
Below 1 Ω
A36-9 (EXI4) - Body ground
Always
10 kΩ or higher
C29-2 - Body ground
Always
Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.INSPECT L4 POSITION SWITCH

Turn the ignition switch off.

Remove the L4 position switch (No. 1 transfer indicator switch) (HILUX_TGN26 RM00000479C008X.html).

Inspect the L4 position switch (No. 1 transfer indicator switch) (HILUX_TGN26 RM0000015HR00KX.html).

REPLACE NO. 1 TRANSFER INDICATOR SWITCH (HILUX_TGN26 RM00000479C008X.html)

OK

5.CHECK TERMINAL VOLTAGE (L4 POSITION SWITCH POWER SOURCE CIRCUIT)

Turn the ignition switch off.

Disconnect the L4 position switch (No. 1 transfer indicator switch) connector.

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

for Automatic Transmission:
Connect the transmission control ECU connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
1 - 2
Ignition switch ON
11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to L4 Position Switch [No. 1 Transfer Indicator Switch])
Result
Result
Proceed to
OK
A
NG (for Manual Transmission)
B
NG (for Automatic Transmission)
C

Text in Illustration
*a	Front view of wire harness connector (to L4 Position Switch [No. 1 Transfer Indicator Switch])

Result
Result	Proceed to
OK	A
NG (for Manual Transmission)	B
NG (for Automatic Transmission)	C

REPAIR OR REPLACE HARNESS OR CONNECTOR

Go to step 6

USE SIMULATION METHOD TO CHECK (HILUX_TGN26 RM000004QR7002X.html)

6.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TRANSMISSION CONTROL ECU)

Turn the ignition switch off.

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

Disconnect the G40 transmission control ECU connector.

Disconnect the L4 position switch (No. 1 transfer indicator switch) connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A36-9 (EXI4) - G40-15 (L4)
Always
Below 1 Ω
A36-9 (EXI4) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TRANSMISSION CONTROL ECU ASSEMBLY (HILUX_TGN26 RM000004ROZ00CX.html)

Tester Connection	Condition	Specified Condition
A36-9 (EXI4) - Body ground	Ignition switch ON Transfer shift position L4	Below 1.5 V

Tester Connection	Switch Condition	Specified Condition
1 - 2	Ignition switch ON	11 to 14 V