Toyota 4Runner: Open Circuit in Transfer 4WD Position Switch Circuit (C1258,C1340)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Open Circuit in Transfer 4WD Position Switch Circuit (C1258,C1340)

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
C12581 C13402	An open circuit is detected in the EXI circuit of the skid control ECU.	Harness or connector Transfer system Master cylinder solenoid (Skid control ECU)

DTC Code

DTC Detection Condition

Trouble Area

C1258*1

C1340*2

An open circuit is detected in the EXI circuit of the skid control ECU.

Harness or connector
Transfer system
Master cylinder solenoid (Skid control ECU)

*1: for Part-time 4WD

*2: for Full-time 4WD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the master cylinder solenoid, perform calibration (See page ).

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (EXI)

(a) Disconnect the A6 skid control ECU connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A6-27 (EXI) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU)

Result

Result	Proceed to
OK	A
NG (for Part-time 4WD)	B
NG (for Full-time 4WD)	C

GO TO STEP 3

GO TO STEP 4

2.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result

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

REPLACE MASTER CYLINDER SOLENOID

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FOUR WHEEL DRIVE CONTROL ECU AND A.D.D. ACTUATOR)

(a) Disconnect the A6 skid control ECU connector.

(b) Disconnect the F47 four wheel drive control ECU connector.

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

Standard Resistance:

w/ Rear Differential Lock

Tester Connection	Condition	Specified Condition
A6-27 (EXI) - F47-15 (ADD)	Always	Below 1 Ω
A6-27 (EXI) - D1-3 (ADD)	Always	Below 1 Ω
A6-27 (EXI) - Body ground	Always	10 kΩ or higher
D1-4 (GND) - Body ground	Always	Below 1 Ω

w/o Rear Differential Lock

Tester Connection	Condition	Specified Condition
A6-27 (EXI) - F47-14 (ADD)	Always	Below 1 Ω
A6-27 (EXI) - D1-3 (ADD)	Always	Below 1 Ω
A6-27 (EXI) - Body ground	Always	10 kΩ or higher
D1-4 (GND) - Body ground	Always	Below 1 Ω

GO TO TRANSFER SYSTEM (PROBLEM SYMPTOMS TABLE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FOUR WHEEL DRIVE CONTROL ECU AND TRANSFER SHIFT ACTUATOR ASSEMBLY)

(a) Disconnect the A6 skid control ECU connector.

(b) Disconnect the F47 four wheel drive control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A6-27 (EXI) - F47-14 (P1)	Always	Below 1 Ω
A6-27 (EXI) - B47-9 (CDL)	Always	Below 1 Ω
A6-27 (EXI) - Body ground	Always	10 kΩ or higher
B47-10 (GND) - Body ground	Always	Below 1 Ω

GO TO TRANSFER SYSTEM (PROBLEM SYMPTOMS TABLE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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