C1340
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1258, C1340: Open Circuit in Transfer 4WD Position Switch Circuit
C1340 - Center Differential Lock Circuit
DESCRIPTION
*1: for Part-time 4WD
*2: for Full-time 4WD
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the master cylinder solenoid, perform calibration Programming and Relearning.
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:
Text in Illustration
Result
C -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FOUR WHEEL DRIVE CONTROL ECU AND TRANSFER SHIFT ACTUATOR)
B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FOUR WHEEL DRIVE CONTROL ECU AND A.D.D. ACTUATOR)
A -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result
B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- REPLACE MASTER CYLINDER SOLENOID Disassembly
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.
(c) Disconnect the D1 A.D.D. actuator connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO TRANSFER SYSTEM (PROBLEM SYMPTOMS TABLE) VF2A Transfer Case System
4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FOUR WHEEL DRIVE CONTROL ECU AND TRANSFER SHIFT ACTUATOR)
(a) Disconnect the A6 skid control ECU connector.
(b) Disconnect the F47 four wheel drive control ECU connector.
(c) Disconnect the B47 transfer shift actuator connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO TRANSFER SYSTEM (PROBLEM SYMPTOMS TABLE) VF4BM Transfer Case System