Transfer Case: Testing and Inspection

ELECTRICAL SHIFT TYPE

Wiring Diagram






INSPECTION OF TRANSFER CONTROL SWITCH

INSPECT SWITCH CONTINUITY
Inspect the switch continuity between terminals.






If continuity is not as specified, replace the switch.



INSPECTION OF TRANSFER L4 POSITION SWITCH




INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals when the switch is pushed (transfer in "H4" position).
(b) Check that there is no continuity between terminals when the switch is tree (transfer in "H2" position).
If continuity is not as specified, replace the switch..



INSPECTION OF TRANSFER CONTROL RELAY




1. INSPECT RELAY CONTINUITY
(a) Check that there is continuity between terminals 1 and 2.
(b) Check that there is continuity between terminals 3 and 4.
(c) Check that there is no continuity between terminals 1 and 3.
If continuity is not as specified, replace the relay.




2. INSPECT RELAY OPERATION
Apply the battery voltage across terminals 1 and 2.
Check that there is no continuity between terminals 3 and 4.
If operation is not as specified, replace the relay.



INSPECTION OF TRANSFER CONTROL SOLENOID




1. INSPECT SOLENOID CONTINUITY
(a) Check that there is continuity between terminals 1 and 2.
(b) Check that there is continuity between terminals 3 and 4.
(c) Check that there is no continuity between terminals 1 and 3.
If continuity is not as specified, replace the solenoid.




2. INSPECT H2 SOLENOID OPERATION
(a) Apply the battery voltage across terminals 1 and 2. Check that air flows from port A to port C. Check that air does not flow from port A to port B.
(b) Check that air flows from port A to port B. Check that air does not flow from port A to port C.
If operation is not as specified, replace the solenoid.




3. INSPECT H4 SOLENOID OPERATION
(a) Apply the battery voltage across terminals 3 and 4. Check that air flows from port A to port C. Check that air does not flow from port A to port B.
(b) Check that air flows from port A to port B. Check that air does not flow from port A to port C.
If operation is not as specified, replace the solenoid.



INSPECTION OF 4WD INDICATOR LIGHT




INSPECT INDICATOR LIGHT OPERATION
(a) Disconnect the connector from the 4WD indicator switch. Connect terminal 1 of the 4WD indicator switch and body ground.
(b) Turn the ignition switch or starter switch on. Check that the bulb lights.
If operation is not correct, remove and test the bulb.



INSPECTION OF 4WD INDICATOR SWITCH




INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals when the switch is pushed (transfer is in the ^~4WD" position).
(b) Check that there is no continuity between terminals when the switch is free (transfer is not in "4WD" position).
If continuity is not as specified, replace the switch.



INSPECTION OF PARKING BRAKE WARNING LIGHT




INSPECT WARNING LIGHT OPERATION
(a) Disconnect the connector from the transfer neutral position switch. Connect the switch terminal and body ground.
(b) Turn the ignition switch or starter switch on. Check that the bulb lights when the neutral start switch is the "N" position.
If operation is not as specified, remove and test the bulb and neutral position switch.



INSPECTION OF TRANSFER NEUTRAL POSITION SWITCH




INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminal and switch body when the switch is pushed (transfer in the "N" position).
(b) Check that there is no continuity between terminal and switch body when the switch is free (transfer not in the "N" position).
If continuity is not as specified, replace the switch.