| Condition | Possible Cause | Action |
|---|---|---|
|
Air lock hub does not lock/unlock
|
4WD switch faulty
|
Check 4WD switch referring to
4WD Switch and 4WD Low Switch Inspection
.
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Defective air locking hub assembly
|
Replace.
|
|
|
Abnormality in 4WD control system
|
Inspect referring to
4WD Control System Check
.
|
|
|
Air leakage from vacuum circuit
|
Check and replace.
|
|
|
Clogged vacuum hose or pipe
|
Replace.
|
|
|
Defective check valve or vacuum tank (M13A engine model)
|
Replace.
|
|
|
Defective vacuum control valve (K9K engine model)
|
Replace.
|
|
|
Defective vacuum pump (K9K engine model)
|
Check and replace.
|