On-Vehicle Inspection

DIFFERENTIAL: DIFFERENTIAL LOCK SYSTEM: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. INSPECT REAR DIFFERENTIAL LOCK SYSTEM





(a) Inspect the indicator light.
(1) Check that the indicator light illuminates for approx. 1 second when the ignition switch is turned ON.
(b) Inspect the differential lock operation.
(1) Jack up the vehicle and start the engine.
(2) When the differential lock control switch is ON the indicator light blinks.
HINT: If the gears of the differential lock system are not engaged, the indicator light continues blinking, so rotate the tires to engage the gear.
(3) When the differential lock control switch is in the OFF position, the indicator light goes off. The differential lock is released for the rear wheel at this time.




(4) Check the voltage between the terminals of the rear differential lock control ECU when switching the rear differential lock control ON, with the speedometer registering at approximately 7 mph (11 km/h) or more.





(5) Return the differential lock control switch to OFF.
(6) Stop the engine and lower the vehicle.
2. INSPECT DIFFERENTIAL LOCK SYSTEM CIRCUIT
(a) Inspect the battery positive voltage.
Battery positive voltage:
10 to 14 V





(b) Inspect the system circuit with the connector disconnected.
Disconnect the connector from the rear differential lock control ECU and inspect the connector on the wire harness side, as shown in the table.
Standard:





If the result is not as specified value, check and repair or replace the malfunctioning part shown in the table above.





(c) Inspect the system circuit with the connector connected.
(1) Turn the ignition switch to the ON position.
(2) Using a voltmeter, measure the voltage when the differential lock control switch is in the positions shown in the table.





HINT: *: The rear differential should be locked mechanically. If the result is not as specified, replace the ECU.
(3) Install the ECU