Component Tests and General Diagnostics

INSPECTION
1. INSPECT H (2WD) <--> H (4WD and Center diff. lock "FREE") SHIFT
a. Ignition switch ON, and shift the transfer shift lever to the "H" position.
b. Check that the 4WD indicator light comes on when the 2-4 selector switch is pressed. Check that the light goes off when the switch is pressed again.

HINT:
- If the light does not light up, even though the switch has been turned ON, the vehicle should be moved back and forth.
- If switching is not completed, the center diff. lock indicator light flashes.





2. INSPECT H (2WD) <--> L4 (Center diff. lock "FREE") SHIFT
a. Ignition switch ON, and the 2-4 selector switch turns to "OFF".
b. Check that the 4WD indicator light comes on when the transfer shift lever is shifted to the "L4" position.
c. Check that the light goes off when the transfer shift lever is shifted to the "H" position.

HINT:
- Inspection should be performed with the vehicle stopped, and transmission shift lever in "N" position.
- If switching is not completed, the center diff. lock indicator light flashes.





3. INSPECT L4 (Center diff. lock "FREE") <--> L4 (Center diff. lock "LOCK") SHIFT
a. Ignition switch ON, and the 2-4 selector switch turns to "OFF".
b. Check that the 4WD indicator light comes on when the transfer shift lever is shifted to the "L4" position.
c. Check that the center diff. lock indicator light comes on when the transmission shift lever is shifted to the "L" position.
d. Check that the center diff. lock indicator light alone goes off when the transmission shift lever is shifted to any one of positions except "L" position.
e. Check that both the 4WD indicator light and the center diff. lock indicator light go off when the transfer shift lever is shifted to the "H" position.

HINT: Inspection should be performed with the vehicle stopped. If switching is not completed, the center diff. lock indicator light flashes.








4. INSPECT 2-4 SELECTOR SWITCH CONTINUITY
a. Remove center integration panel assembly.
b. Inspect the continuity between the each terminals. If continuity is not as specified, replace the center integration panel assembly.





5. INSPECT ACTUATOR RESISTANCE
a. Using an ohmmeter, measure the resistance between terminals 1 and 2.
Standard resistance: 0.3 - 100 ohms
b. Using an ohmmeter, measure the resistance between terminals 1 or 2 and body ground.
Standard resistance: More than 0.5 M ohms
If resistance value is not as specified, replace the actuator assembly.
6. INSPECT ACTUATOR OPERATION





a. H4F (4WD and Center diff. lock "FREE") --> H4L (4WD and Center diff. lock "LOCK") shift:
Connect lines via a relay, then check that the actuator fork shaft moves to H4F (4WD and Center diff. lock "FREE") --> H4L (4WD and Center diff. lock "LOCK") position.





b. H4L (4WD and Center diff. lock "LOCK") --> H4F (4WD and Center diff. lock "FREE") shift:
Connect lines via a relay, then check that the actuator fork shaft moves to H4L (4WD and Center diff. lock "LOCK") --> H4F (4WD and Center diff. lock "FREE") position.





c. H4L (4WD and Center diff. lock "LOCK") --> H2 (2WD) shift:
Connect lines via a relay, then check that the actuator fork shaft moves to H4L (4WD and Center diff. lock "LOCK") --> H2 (2WD) position.





d. H2 (2WD) --> H4L (4WD and Center diff. lock "LOCK") shift:
Connect lines via a relay, then check that the actuator fork shaft moves to H2 (2WD) --> H4L (4WD and Center diff. lock "LOCK") position.





HINT: When inspecting the operation described above, use a heater main relay.

NOTICE: Connect the terminals being careful not to touch the neighboring terminals or metallic parts of relay housing.








7. INSPECT LIMIT SWITCH CONTINUITY
a. Start the engine and raise the vehicle.
b. With the actuator connector connected, shift the transfer shift lever and after checking the operating sound, disconnect the connector and inspect the continuity between each terminal.

HINT: When shifting the actuator fork shaft, connect the connectors.

8. INSPECT VEHICLE SPEED SENSOR.
9. INSPECT 4WD INDICATOR LIGHT
Check the combination meter.
10. INSPECT 4WD CONTROL ECU





Connect the wire harness side connector to the 4WD control ECU and inspect wire harness side connector from the back side.





STANDARD VALUE OF ECU TERMINAL