Question about 1991 Toyota 4Runner

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1991 Toyota 4 Runner, manual transmission, 5 speed: At high elevation (9500' plus) going uphill 4 wheel drive flutters: light and actual four wheel drive goes in and out in a spastic fashion. I did replace the vacuum solenoid (Ouch! $ 450.00) but it did not chage the situation. If you stop for a while four wheel drive comes back, but it won't stay on reliably. Going downhill there is no problem with the four wheel drive. Could it be low vacuum level or maybe electrical? How to find out?

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Where is the four wheel module located on a 2001 f350 7.3 l lariat 4x4 nothing on the four wheel drive works and I checked all the fuses and are all fine


Have it check for DTC'S - diagnostic trouble codes ?
GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action C1728 Transfer Case Unable to Transition Between 2H and 4H GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. C1729 Transfer Case Unable to Transition Between 4H and 4L GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P0500 Vehicle Speed Sensor (VSS) Malfunction GEM GO to Pinpoint Test F . P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM GO to Pinpoint Test H . P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure GEM GO to Pinpoint Test I . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM GO to Pinpoint Test E . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM GO to Pinpoint Test E . P1819 Transmission Park/Neutral Position Switch Short Circuit to Ground GEM GO to Pinpoint Test F . P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short to Battery GEM GO to Pinpoint Test E . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1830 Transmission Transfer Case Counterclockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test E . P1832 Transmission Transfer Case Differential Lockup Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1834 Transmission Transfer Case Differential Lockup Solenoid Short Circuit to Battery GEM GO to Pinpoint Test G . P1865 Transmission Transfer Case Contact Plate Power Short to Ground GEM GO to Pinpoint Test E . P1866 Transmission Transfer Case System Concern - Servicing Required GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM GO to Pinpoint Test E . P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test G . - For All Other DTCs GEM GO to Section 419-10 .
Your best bet , take it to a qualified repair shop that has the diagnostic tool to trouble shoot .
Principles of Operation
Transfer Case - Electronic Shift
The four-wheel drive, electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4X4 HIGH, and 4X4 LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators, one for 4X4 HIGH which is 4X4, and one for 4X4 LOW which is LOW RANGE (in 4X4 LOW both the lamps are on). Shifts into 4X4 HIGH can be made at any speed. When shifting into 4X4 HIGH with the vehicle stationary, tooth blockage may occur, preventing shift completion. When the vehicle is driven above 8 km/h (5mph) the shift will complete. When shifting in or out of 4X4 LOW, the generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission). (The digital transmission range [TR] sensor informs the GEM when the automatic transmission is in the NEUTRAL range position.)
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and the range fork within the transfer case between the 4X4 HIGH, 4X4 LOW, and 2WD range positions.
The GEM uses two relays to control the gearmotor encoder assembly shift between 4X4 HIGH, 4X4 LOW, and 2WD modes. The GEM controls the pulse vacuum hublock (PVH) solenoid which supplies engagement and disengagement vacuum to control the hublocks.
The GEM accomplishes shifts by interpreting inputs from:
  • mode select switch (MSS)
  • vehicle speed signal (transmitted from the ABS system)
  • gearmotor encoder plate position
  • brake pedal switch
  • digital transmission range (TR) sensor (automatic transmission)
  • clutch pedal position (CPP) switch (manual transmission)
  • ignition switch
Based on these inputs, the GEM controls the shifts into 2WD, 4X4 HIGH, or 4X4 LOW with the following outputs:
  • low to high relay (clockwise)
  • high to low relay (counterclockwise)
  • pulse vacuum hublock (PVH) solenoid
  • gearmotor encoder assembly
The electronic shift-on-the-fly (ESOF) system has a feature which allows the driver to override the vacuum operated hublocks. When the front hublocks are manually turned to the LOCK position, the hublocks are locked at all times, overriding the vacuum operated system. If the front hublocks are manually turned to the AUTO position, the hublocks can only be locked by turning the MSS to 4X4 HIGH or 4X4 LOW position.

Jun 12, 2017 | Cars & Trucks

1 Answer

Transmission engages but does not drive and makes a whineing noise when in park


Toyota 4 Runner has either auto transmission or manual transmission. If it is auto trans, it could be due to the following reasons:
1.Wrong grading and classification of transmission oil. (ATF Dexron II).
2. Clogged transmission filter. (Clean or replace)
3. Worn out clutch friction discs and pressure plates. (replace)
4. Broken fly wheel and/or torque converter. (replace)
5. Check transmission control knobs and switches for if they are at their actual position where they are supposed to be.

Dec 06, 2013 | 1994 Toyota 4Runner

1 Answer

Imitsubishi shogun engaging 4 wheel drive


no year?
never drive, part time 4wd on pavement, unless said pavement
is ice or snow covered.
only AWD allows pavement (tires direct upon) driviing.
part time 4wd is for offroad , off pavement driving,
this is because 4wd has no center differential.
http://en.wikipedia.org/wiki/Four-wheel_drive

and with out such, winds up the drive line fast. and breaks it.

wiki states (no year stated by you)
Part-time four-wheel drive was standard on all models. to 1991
then came
ActivTrak 4WD
cept
4H (high-range full time four-wheel drive), 4HLc (high-range four-wheel drive with locked center differential) and 4LLc (low-range four-wheel drive with locked center differential
so do not use LOCKED on pavement. on active track. only 4H
the wiki states the Super-select is retained 2006 to present.
Super-Select 4WD II

read the glove box manual under 4wd

Oct 16, 2013 | Cars & Trucks

1 Answer

I have a '91 Toyota 4 runner 4x4, recently it has


Find a good transmission shop or a friend that is capable. It sounds like either your linkage may have been compromised or you need some serious transmission repair.

Feb 23, 2012 | 1991 Toyota 4Runner

1 Answer

Where is the VSS located on a 1991 toyota 4Runner, automatic transmission, 3.0 liter


on the trans tailshaft on the left side of transmission.the taailshaft is where the driveshaft goes into the transmission. NOTE:on a 4 wheel drive,the speed sensor is on the transfer case near the back where the drive shaft connects to the transmission.

Aug 07, 2011 | 1991 Toyota 4Runner

1 Answer

On a toyota 1990 four runner 4 wheel drive automatic is the transfer case attached to the transmission and have to come out all as one peice.


YES THE TRANSFER CASE IS JOIN TO THE TRANSMISSION IT CAN BE REMOVED BUT ITS MUCH EASIER TO REMOVE IT AS ONE UNIT THEN SEPERATE IT ON THE BENCH

Jul 21, 2011 | 1990 Toyota 4Runner

4 Answers

I HAVE A 2002, 4-WHEEL DRIVE, TOYOTA TUNDRA PICK-UP TRUCK. IT HAS A 4-WHEEL DRIVE PROBLEM. RECENTLY I USED THE 4-WHEEL DRIVE, IN HI-GEAR. IT PERFORMED GREAT. WHEN I DEPRESSED TO BUTTON ON THE DASH TO...


I was researching the recalls for the 2002 tundra and havent found any recall pertaining to the 4whl drive. Sometimes when people have their 4wheel drive locked in and drive on pavement for any length of time, whether it be just a couple of feet or a couple of miles, over time it creates a binding of the gears in your transfer case. Once the bind is so great, the engaging and disengaging starts malfunctioning and leads to bigger problems overall. I could be wrong about this being the problem that you have but I think its something to look into. It wouldnt hurt to put your vehicle up off all fours and release the bind if any by running through the gears while in 2 and rour wheel drive while all four tires can move freely and release. See if that works for you. Check your gear oil front , center and rear and use much caution when attempting this suggestion. Also refer to your owners manual troubleshooting section for other possibilities. Merry Christmas. By the way, the electrical switch should be covered in the troubleshooting section also.

Dec 04, 2010 | 2002 Toyota Tundra

2 Answers

My overdrive lightis flashing on my 1991 toyota 4 runner.


means it's going out or the transmission oil will need to be changed, check the transmission fluid if it is brown and smells likes onions have the fluid changed and the filter, this may not fix it but you may get lucky, if it's the band or clutch assembly you will have to rebuild transmission.

Nov 08, 2009 | 1991 Toyota 4Runner

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