Truck Tech

 

 

Hi Roger;

I have a 1991 4Runner with a cruise control problem.The main switch lights up on the dash board info bar but the controls donít activate.I visually checked the fuses, they are all good.Have to pull them out and test them with a meter.The ones in the engine bay are also good.What else could it be?Vacuum line or bad servo?Thanks for the help! Buc23

 

Hi Buc23;

Make sure you have good vacuum at the servo.If itís a manual transmission, make sure the clutch switch is adjusted right.It needs to be held in until you depress the clutch pedal when the switch pops out and opens.

        Roger

 

 

[A reply from Buc23]

Hi Roger;

It is an A/T equipped one.I will check to see if the hose has melted or rotted.When I press the ďsetĒ button nothing happens, thatís why I think it is an electrical problem.Thanks for the help!Buc23

 

Hi Buc23;

If the light comes on, it is getting power.Assuming the brake switch is working right, the only other input is the Vehicle Speed Sensor, not sure which one it uses on the A/T, there is one in the transmission and one on the back of the speedometer.Other thing to check is the cab ground point; it is behind the driverís side kick panel.On my Ď85, the ground bolt is right next to the cruise control module.Mine would set a speed but lose setting when hitting a bump in the road (was an intermittent ground issue).

        Roger

 

 

[Another reply from Buc23]

Hi Roger;

Well, now that you mentioned it I do have a constant somewhat dim ďbrakeĒ light on all the time on the dashboard too.It gets brighter when I pull the e-brake and dim again when I disengage the e-brake handle.I checked the master cylinder reservoir and it is full of fluid.Is there a separate switch for the warning light and stoplight switch?

I went out to the truck and check the vacuum hoses and they seemed ok. I did notice two electrical connectors and what look like an electric solenoid on the base of the servo. The throttle cable seems fine with some cracking on the insulation, but nothing serious.

 

Hi Buc23;

Looking at my Ď85 Factory Service Manual, the cruise control has inputs from both the stop light switch (on the brake pedal) and from the parking brake switch (on the e-brake handle - I guess this is a safety feature, I was unaware of this connection before).I would check the adjustment of the e-brake switch, make sure its working right.

        Roger

 

 

[Yet another reply from Buc23]

Hi Roger;

You may be on to something here.A couple of friends of mine told me the same thing about the e-brake handle switch.If the light on the dash is on the cruise wonít engage.Thanks for the help... you being the only one that have something to say!

UPDATE!I checked the e-brake switches like you suggested and viola!The light went out after I unplugged, cleaned, and plugged in the pressure switch in the master cylinder.I went out and drove the 4Runner and sure enough the cc works like is supposed to.One more time thanks a bunch!†† Buc23

 

 

Hi Roger;

Iíve been too busy with this truck of mine. Itís great. Instead of driving it to the trails, I tow it, now. Do you know the best position for the transmission and transfer case while being towed with all fours on the ground?Iíve been using Neutral & Neutral, but recently found out that Jeeps recommend transfer - Neutral, and transmission in any gear. I would hate to think Iíve towed my truck for 700 miles without having the transmission lubricated (thus the need to be in gear). Toyota called their service reps and they wonít give any info on towing, as they donít recommend it for their vehicles. Thanks in advance for any input. Vehicle is a 1985 22re, solid front axle, 4 speed.Steven Scates

Hi Steven;

Unless you have a twin stick t-case shifter, it is best to leave it in 2H. In neutral, you are also in 4WD, so you are probably spinning both front and rear driveshafts while flat towing. This is right out of the Ownerís Manual.Reason being that the t-case has no true neutral position in stock mode. The only location where you can get ďNĒ is between 4H and 4L due to the shifter interlock pin. With a twin stick shifter, you pull that pin and then can leave the 2-4 stick in 2 and move the H-N-L stick to N.Best is to unbolt the rear shaft at the pinion flange, tie it up under the truck and go like that.Or pop for a full floating rear axle kit (like Front Range Offroad makes) and then you can just unlock the rear hubs for towing and lock them back up for the trail.

        Roger

 

[A reply from Steven]

Hi Roger;

Just got back from the desert. I towed in 2H & neutral. This solved the front differential spewing fluid from the overflow.You were right about spinning both shafts in neutral. I guess the front differential canít handle the high speed with its stock vent. Indeed, 2H didnít spin the front driveshaft. Eventually I will go to full floating axles in the back, along with the 3.4 engine from my 4runner. I have been really close to fully modifying this truck, as it is only used off-road. But, it does awesome right now. 32í 11.50ís, stock height, Detroit locker in the rear, open in the front. Does great everywhere except the big rocks (ouch!). Thanks again for the info on towing.Steven Scates

 

 

Hi Roger;

I have an 86 4x4 22re.Driving along with the heat cranked and all of sudden the fan starts to die out, not dead, but, like high speed is now low speed and low speed is super low speed.Should I just go ahead and replace the blower motor or could it be something else?In the past I found that when the blower motor went, it would be right dead.This one is still kicking.Thanks, Sixpack.

Hi Sixpack;

Likely the brushes are wearing out or the bushings have dried out. Pull the fan/motor out and open up the motor and have a look inside.See the repair information on my web page, below:

http://www.4crawler.com/4x4/CheapTricks/Blower.shtml#MotorRepair

        Roger

 

[A reply from Sixpack]

Hi Roger;

What brushes?Ya, I took it apart, the brushes are virtually gone.Thanks for the pointers and the pictures on your site are helpful.Sixpack.

 

 

Note:

If you are searching for, building, modifying, or maintaining a Toyota 4WD mini-truck (Pickup, Hilux, 4Runner, Surf, or Tacoma), send your Truck Tech questions to Roger Brown at <TruckEditor@tlca.org>.Iíll try to answer your questions with authority!And please be sure to provide a valid return address in your e-mail if you want a faster reply.