3C
Air lock hub does not lock/unlock
Diagnose transfer assembly after performing 4WD control system check described in 4WD Control System Check .
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.