Suzuki Jimny Service Manual page 179

3D-6 FRONT SUSPENSION
OPERATION
2WD → 4WD
When the transfer shift control lever is shifted from the 2WD (2H) position to the 4WD (4H or 4L) position, a 4WD
"ON" signal is transmitted to the 4WD controller which then activates VSV2 to apply vacuum in the intake mani-
fold to the chamber "B" in the hub housing.
When vacuum is applied, the slide gear is separated from the magnet, moves toward the center of the vehicle
body and gets engaged with the outer gear. In this way, the front axle shaft and the front wheel hub rotate as one
unit.
If vacuum in the circuit fails to reach 260 mmHg within 15 seconds after operation of VSV2 due to such trouble
as a hole in the vacuum pipe, the slide gear does not operate and the 4WD indicator light flashes to warn that
the hub is unlocked.
1. ECM
2. 4WD controller
3. 4WD indicator lamp
4. 4WD switch
5. A/C switch (if equipped)
6. Vacuum switch
7. A/C cut signal (if equipped)
8. Engine speed signal
9. Intake manifold
10. Check valve
11. Vacuum tank
12. VSV1
13. VSV2
14. Outer gear
15. Chamber B
16. Piston A
17. Magnet
18. Housing
19. Spring
20. Diaphragm
21. Sleeve
22. Slide gear
23. Wheel hub
24. Spindle
25. Front axle shaft
26. To opposite side
27. A/C controller
A: Vacuum circuit