Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Transfer L4 Position Switch Circuit (C1268)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1268

Transfer L4 Position Switch Circuit

Either of the following is detected:

  • The skid control ECU (brake actuator assembly) detects an L4 detection switch (Transfer shift actuator assembly) open circuit.
  • The skid control ECU (brake actuator assembly) receives an L4 abnormal status signal from the HDCS terminal.
  • L4 detection switch (Transfer shift actuator assembly)
  • L4 detection switch circuit
  • Skid control ECU (Brake actuator assembly)

HINT:

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page PROCEDURE PROCEDURE ).

PROCEDURE

1.

INSPECT L4 DETECTION SWITCH (TRANSFER SHIFT ACTUATOR ASSEMBLY)

(a) Inspect the transfer shift actuator assembly (See page OK: ).

OK:

The transfer shift actuator assembly is normal.

NG

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - L4 DETECTION SWITCH)

(a) Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(b) Disconnect the T4 L4 detection switch (Transfer shift actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S1-5 (EXI4) - T4-9

Always

Below 1 Ω

S1-5 (EXI4) - Body ground

Always

10 kΩ or higher

T4-10 - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (L4 DETECTION SWITCH CIRCUIT)

OK

3.

CHECK HARNESS AND CONNECTOR (HDCS TERMINAL)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S1-27 (HDCS) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

RECONFIRM DTC

(a) Clear the DTC (See page ). (b) Check if the same DTC is recorded (See page ).

(b) Check if the same DTC is recorded (See page Result Result ).

Result

Result

Proceed to

DTC is output

A

DTC is not output

B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

USE SIMULATION METHOD TO CHECK

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