Toyota 4Runner: Center Differential Lock Position Switch (C1282)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Center Differential Lock Position Switch (C1282)

DESCRIPTION

DTC C1282 is stored only in test mode.

DTC Code	DTC Detection Condition	Trouble Area
C1282	Stored during test mode.	Harness or connector Transfer system Master cylinder solenoid (Skid control ECU)

HINT:

For vehicles with part-time 4WD, this DTC indicates problems when shifting from 2WD to 4WD.
For vehicles with full-time 4WD, this DTC indicates problems when switching the state of the center differential lock.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CONFIRM VEHICLE SPECIFICATIONS

(a) Confirm the vehicle specifications.

Result

Result	Proceed to
for Part-time 4WD	A
for Full-time 4WD	B

GO TO STEP 5

2.	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 Transfer 2WD position	11 to 14 V
A6-27 (EXI) - Body ground	Ignition switch ON Transfer 4WD position	Below 1.5 V

Text in Illustration

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

GO TO STEP 4

3.	CHECK TEST MODE DTC

(a) Switch the vehicle to test mode, perform the 4WD detection switch signal check, and then check that DTC C1282 is cleared (See page ).

Result

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

REPLACE MASTER CYLINDER SOLENOID

USE SIMULATION METHOD TO CHECK

4.	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

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

GO TO TRANSFER SYSTEM (PROBLEM SYMPTOMS TABLE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	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 Center differential free	11 to 14 V
A6-27 (EXI) - Body ground	Ignition switch ON Center differential locked	Below 1.5 V

Text in Illustration

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

GO TO STEP 7

6.	CHECK TEST MODE DTC

(a) Switch the vehicle to test mode, perform the center differential lock detection signal check, and then check that DTC C1282 is cleared (See page ).

Result

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

REPLACE MASTER CYLINDER SOLENOID

USE SIMULATION METHOD TO CHECK

7.	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

GO TO TRANSFER SYSTEM (PROBLEM SYMPTOMS TABLE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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