Air Pump: Testing and Inspection

DIAGNOSIS AND TESTING

LOCKER PUMPS
1. Connect a pressure gauge to the front pump.
2. Place transfer case in 4WD Low and automatic transmission in Park (1st gear if manual transmission).
3. Turn ignition to the ON position and push the dash switch twice to activate the front pump.





NOTE: If pump is not running, verify pump has (Fig. 28) 12 volts and a ground.

4. With the pump running the pressure gauge should show 5 psi..

NOTE: If pump does not produce 5 psi. replace the pump.