Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1248/48: Open Circuit in Rear Differential Lock

DTC C1248/48 - Open Circuit in Rear Differential Lock

DESCRIPTION

The 4WD control ECU stimulates the actuator to lock the rear differential in accordance with the rear diff. lock switch. The skid control ECU monitors the transfer indicator switch (rear diff. lock) and if the rear differential is locked, at which time the rear diff. lock indicator light is illuminated, prohibits ABS, TRAC and VSC controls. At the same time, the skid control ECU illuminates the ABS warning light and VSC TRAC warning light.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT SKID CONTROL ECU (EXI3 TERMINAL VOLTAGE)





(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage.
Standard Voltage:





(d) Turn the ignition switch to OFF.
(e) Reconnect the skid control ECU connector.
NG -- INSPECT TRANSFER INDICATOR SWITCH (REAR DIFF. LOCK)
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTC (Reading and Clearing Diagnostic Trouble Codes).
(b) Drive the vehicle at 50 km/h (31 mph) or more for 3 seconds or more with the rear differential free.
(c) Check if the same DTCs are detected.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID
3. INSPECT TRANSFER INDICATOR SWITCH (REAR DIFF. LOCK)





(a) Disconnect the transfer indicator switch connector.
(b) Remove the transfer indicator switch.
(c) Measure the resistance.
Standard Resistance:





(d) Reinstall the transfer indicator switch.
(e) Reconnect the transfer indicator switch connector.
NG -- REPLACE TRANSFER INDICATOR SWITCH (REAR DIFF. LOCK)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR





(a) Disconnect the skid control ECU connector.
(b) Disconnect the 4WD control ECU connector.
(c) Disconnect the transfer indicator switch connector.
(d) Turn the ignition switch to the ON position.
(e) Measure the voltage.
Standard Voltage:





(f) Turn the ignition switch to OFF.
(g) Reconnect the transfer indicator switch connector.
(h) Reconnect the 4WD control ECU connector.
(i) Reconnect the skid control ECU connector.
OK -- REPLACE 4WD CONTROL ECU
NG -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR





(a) Disconnect the skid control ECU connector.
(b) Disconnect the 4WD control ECU connector.
(c) Disconnect the transfer indicator switch connector.
(d) Disconnect the combination meter connector.
(e) Measure the resistance.
Standard Resistance:





(f) Reconnect the combination meter connector.
(g) Reconnect the transfer indicator switch connector.
(h) Reconnect the 4WD control ECU connector.
(i) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER ASSEMBLY