4 Runner Limited 2WD V6-3.4L (5VZ-FE) (1997)
4. When the differential lock control switch is at the off position, the indicator light goes off, the differential lock is released for the rear
wheel at this time.
5. Check the voltage between the terminals of the four wheel drive control ECU when switching the differential lock control switch with the
speedometer, registering approx. 8 km/hr. (5 mph) or more. With the switch position on, the specified value at terminal M1-M2 is 0.5 V
or less (No change).
6. Check that the indicator lights blink when the two wheel drive mode is set. The differential lock is released for both the rear wheels at this
time.
7. Return the differential lock control switch to OFF.
8. Stop the engine and lower the vehicle.
2. Inspect the differential lock system circuit, doing the following.
a. Inspect the battery positive voltage, it should be 10-14 V.
b. Inspect the system circuit with the connector disconnected. Disconnect the connector from the four wheel drive control ECU and inspect the
connector on the wire harness side, as shown in the chart.
NOTE: If the circuit is not as specified, check and repair or replace the trouble 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. Keep the center differential lock condition.
3. Remove the differential lock ECU.
4. Using a voltmeter, measure the voltage when the differential lock control switch is in the position, as shown below, if the circuit is not as
specified, replace the ECU.