Differential Assembly: Testing and Inspection

Symptom Charts








Vacuum Tubing Inspection





1) Pull out the Hose A in figure and install a negative pressure gauge.
2) Plug up Hose B in figure to prevent the leak of negative pressure.
3) Start the engine and measure negative pressure 2 or 3 minutes afterward.
4) Repeat 1) and 2) but with Hose A plugged and Hose B pulled out.
5) If negative pressure measures - 400 mmHg, or if it shows a sudden drop immediately after engine stop, inspect the hose, tank, and pipe for damage.

NOTE: Be careful not to permit the entry of dust and water during inspection.

6) Pull out Hose D.
7) Plug Hose E.
8) Make sure that Hose D is under atmospheric pressure.
9) Pull out Hose E and plug Hose D, and make sure that Hose E is under atmospheric pressure.
10) If Check 8) or 9) has revealed stoppage, check and see that there is no bend, foreign matter in the hose or in the filter. If there is trouble, repair or replace.


Check Valve





1) Apply negative pressure of -400 mmHG from the orange colored side.
2) Check leakage of negative pressure.
3) Make sure that negative pressure cannot be applied from the black colored side.
4) If negative pressure is not applicable as much as -4OO mmHg, and if there is resistance on the intake side, replace with a new check valve.


VSV Assembly Inspection





1) Remove connector.
2) Shift transfer lever to 2H and start the engine.

NOTE: The vehicle should not be started, with the engine idling.

3) Make sure that there is continuity in the vehicle side of harness. If there is no continuitv, check transfer shift switch and wiring.

Inspection (2)






Inspect the both VSVs as follows:













Functional Detective Switch





Actuator

Visual Check

Check and see that there is no damage, cracking, or other abnormality.

Functional Check














Disconnect the shift position switch. Make sure of function with a negative pressure of -400 mmHg applied to Ports A and B, in accordance with the table above.

If there is an abnormality, replace the actuator as an assembly.

NOTE: If the actuator works under -400 mmHg or less, there is no functional problem. Be careful not to permit the entry of water or dust into the ports of the actuator.

Dimensional Check











Measure illustrated sizes A, B, and C.