Question about 1993 Chevrolet K2500
Vehicle will not go into 4X4, have changed the axle actuator and transfer case switch with no effect. The shift lever is put into the 4 hi pos but never get a light indication and no 4X4 engagement. The same with 4 Lo. No 4X4 no light. Does this Truck have another relay or contact that could cause this trouble? Or am I looking in the wrong direction?
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Posted on Jan 02, 2017
Find the accuator on the front axle it has a two wire pigtail and threads into the axle housing. Check for power and ground if you have both when the transfer case is in 4x4 the replace the accuator. They are available at most parts stores and are a very common problem. Let me know how it goes.
Posted on Dec 16, 2008
SOURCE: 4wd not engaging
Is it a two wire actuator or a three wire actuator? The two wire ones are pretty unreliable. that is why Chevrolet converter them to the three wire. Check for power and ground on the two wire in 4wd. For the three is should have one ground wire, one wire that is hot in 4wd, and one wire that is hot in 2wd.
Posted on Mar 02, 2009
Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer
Posted on Mar 30, 2009
check all wire conections also replace the actuator on the front axle but check for power there first if you have power replace that switch as well .
Posted on Aug 27, 2009
Tips for a great answer:
Feb 14, 2016 | 2001 GMC Yukon
Feb 10, 2015 | 2004 Chevrolet TrailBlazer
When the actuator pump is not working (by not applying pressure) the other front wheel should remain stationary while the wheel turned by hand is turning.
Install the actuator pressure gauge to the actuator pump assembly (1) .
Install a voltmeter and the battery to the pump assembly (1) .
Tighten the adjusting knob as far as it will stop and the air check side opening by a hose as a blind plug.
Check that the actuator assembly motor starts to run (a running sound can be heard) when the battery is connected and when it stops when specified pressure is obtained. Specified pressure is: 38.0- 58.0 kPa (5.40 -- 8.25 psi).
Ensure that the voltmeter is within specifications when the motor is running should be about 0v and when the motor has stopped it should be about 10 -- 14v
good luck !
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