Question about 2003 Toyota Tacoma

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4wd actuator could it be a switch or something near the shifter

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Posted on Feb 12, 2014

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Frontend wont lock in 97 blazer.?


Front end lock is vacuum actuated and if there is no vacuum from the shifter switch, it will not lock the front end. Make sure there is vacuum going down to the switch/valve on the shifter with it in 4wd and engine running, then find if there is vacuum coming out the other side of the switch on the tranny shift valve. On the right fender you will find the cable pull that the vacuum actuates to pull cable and put the front end in gear. Have someone watch while you shift into 4wd to see if the cable is pulled. Check there to see if there is vacuum coming to it when in gear. If there is no vacuum there then the shifter vacuum switch is bad or the line is not connected.

Nov 30, 2014 | 1997 Chevrolet Blazer

1 Answer

I have a 1992 blazer and the 4 wheel drive doesnt work, what are some thing s that would make this happen? but my transfer case is funtioning. because the front drive shaft will spin but the axel isnt...


most common problem we see with the s-10 is there is a vacuum actuator under the battery box this is what engages the front definitional there is a vacuum switch in the top of the transfer case when you move the shifter into 4wd there is a lever inside the transfer case that pushes on the tor on the bottom of the vacuum switch witch allow es vacuum to flow to the front engage actuator under the battery box. so with all this said, check to make sure their is no vacuum leak form the back of the intake manifold to the switch and from the switch to the actuator, if their is no vacuum leak , and when the shifter is in 4wd and their is vacuum to the actuator then replace the actuator or cable if no vacuum to actuator then replace the switch on top of the transfer case.

best guess is you have a vacuum leak to the switch, the vacuum hoses run close to the exhaust manifold and if they come out of there bracket they will touch the manifold and get burned into.

Mar 24, 2011 | 1992 Chevrolet S-10 Blazer

1 Answer

Hello, I have a 1992 Chevy K1500 pickup, 5 speed, 4WD. I just replaced thermal 4WD actuator for the front axle with the new motor type and with a new wiring harness. Always goes into 4WD right away now....


Sounds like you have the actuator switch set to tight. You might want to try to adjust the switch so it has a little room between the switch and the shifter. Hope this helps.

Apr 12, 2017 | 1992 Chevrolet K1500

1 Answer

2005 Trailblazer XT won\'t go into 4WD. Front hubs don\'t engage with switch in cab. It will gear down to 4wd Lo but front wheels won\'t engage. Please help. Can\'t afford the dealer!


i've been told it was the 4wd actuator located on the passenger side near were the cv joint goes in to the front axle a good test is to floor jack it up so both wheels are off the ground and have someone on the other side , put in nutrual turn both wheels one way at same time and the 4wd drive shaft should turn if not its your actuator, costs about $86 for anew actuator and takes about 5 mins to change once you have the tire off

Feb 11, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

When shifting into four wheel drive the fuse blows


There are 2 switches (one on top of the transfer case left side above shifter) this then sends power to the electric actuator to engage the front axle. Quite often the actuator is internally shorted causing fuse to blow. I'm sorry I don't have a schematic in front of me. The second switch is on the front axle and will illuminate the 4wd light when engaged. It could be shorted but won't inhibit 4wd operation (its a separate circuit). Remove the connector at the front axle actuator and jumper it directly to battery (using a fused jumper). if it operates, and fuse doesn't blow, then you have a wire chaffed to ground. Most often its near the front axle harness that gets rubbed thru. If the fused jumper blows then obviously the actuator is no good. I hope this helps some.

Jan 26, 2011 | 1991 GMC Sierra

1 Answer

My 4 wheel drive will not shift out of 4X4 when i put the shifter in 2H. It will eventually shift out after a while but not when I want it to. If I pull the fuse in the dash, it will not do it at all.


On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the whining or grinding noise you hear.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1999 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Apr 07, 2010 | 1996 Chevrolet K1500

2 Answers

I have a 2002 Chevy Silverado 8 cylinder 4wd extended cab. It has the push button shifter for 4wd. When I try to use 4WD Auto or 4WD Hi, the indicator lights come on but the 4wd does not engage. I read...


Fuse is located at the end of eh dash on drivers side and the Actuator is located at the front differential and on the passenger side.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 88-99 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Feb 03, 2010 | 2002 Chevrolet Silverado

2 Answers

Front end will not lock in in 4x4 transfer case is in & dash lite shows 4x4 but front wheels don;t lock in


Ok, this is probably going to sound greek if you have no automotive experiance, so here goes:

There are 2 possibilities I can think of at the moment depending on your 4wd system, however there are several things that can cause this

If you have a Push button 4wd (you push a button or turn a knob) the system engages using actuators or sylinoids meening you turn the 4wd on, the switch sends power to the selector option (high and low) and the 4wd light on the dash. the selector determines where the actuator/silenoid engages (either high or low) in the transfer case. However the actuator or silenoid can be faulty and yet the system will say 4wd is on because the switches still sending power to the 4x4 light

The next setup is the manual linkage set up, and given the year of your kia I doubt you have this setup However I am going to go through it anyway.

With a maual linkage setup you engage the trasfer case maualy using the 4wd shifter. Ironically on newer manual shift 4wd systems the dash light is still triggered electrically by location of the shifter not what is going on in the transfer case (Ah a flaw in the design) So if you linkage is loose/bent/damaged or somehow disconnected your 4wd wont engage but the light will still show that it is! Hope this helps

Jan 30, 2010 | 1999 Kia Sportage

1 Answer

1995 gmc yukon wiyh 6.5 diesel 4 wheel drive will not engage front hubs transfer case feels ok was working last year first time i tried this winter . lights on 4x4 shifter are not working thanks buddy


On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Jan 02, 2010 | 1995 GMC Yukon

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