Question about Chevrolet Silverado 1500HD

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2002 1500hd 4wd will not shift out and locks switch up. switch has been changed and not been in 4wd very much

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I am assuming that this has the push button system in it. under neath the front end is a actuator wich as as a relay to deliver the message from the cab(switch) to the transfercase if that relay is out or not funtioning that will cause this to happen. test the wiring plug at actuator for power if it has power then the actuator is faulty. this system is similar to the lever linkage but with this you dont have a linkage it all relies on electrical circut. good luck let me know what ya find

Posted on Dec 18, 2008

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I have a 93 jeep Cherokee, it will move in 4wh and in 4wl but will not go back into 2wd?


Hello guy
try posting what 4wd system you have,? first.
command trac or select track, (the latter is full time)
part time or the full time system,
we cant guess it....
read the operators guide first, if a part time system only
as i suspect, stop driving on dry pavement.
it's only for ice, or dirt. part time. part time is not a full time system.
Command-Trac
shifting to 4wd on dry (means no ice) pavement causes, drive line wind up! and the gears to lockup. (see steering get tight in turns?> and is dangerous to drive it like this , you, me and the box)
posted here 100s of times.

http://www.rubicon-trail.com/4WD101/driveline-bind.html


the non grand Cherokee. early

had these choices
  • 1987-2001: New Process NP231 Command-Trac, part-time only, 2.72:1 ratio with low range
NP231 has the following settings: 2HI, 4HI, N, 4LO
  • 1987-2001: New Process NP242 Selec-Trac, full-time or part-time, 2.72:1 ratio with low range
NP242 has the following settings: 2HI, 4 full-time, 4 part-time, N, 4LO


as you can see you need to first know, what NP box you have or
photo your shift lever for 4wd, an post it and we tell you.

more facts, on select trac. (totally unlike command trac)
Selec-Trac locking hub is used on 4WD Cherokee. Selec-Trac
utilizes a non-disconnect front axle. Engagement of 2WD or 4WD is
accomplished at transfer case by means of mechanical shift linkage.
System allows full or part time 4WD. Selec-Trac can be shifted into
2WD or 4WD modes from inside the vehicle at any speed.
unquote
next from the service manual,
4WD TO 2WD
1) Place mode select switch in 2WD position. Transfer case
should shift to 2WD and not allow shifting into 4WD or LO range. Axle
should shift after transfer case shifts.
2) To determine if front axle has completed a shift out of
4WD into 2WD, position mode select switch back to 4WD position while
operating vehicle at slow speed. If vehicle shifts into 2WD, axle will
ratchet. If shift is not completed, transfer case will shift into 4WD
and hissing sound will come from mode select switch.
end quote.

if unsure read the FSM book its free.
shows you both systems and how to diagnose it.

in the box, click Cherokee,,then click 1993, and behold.
the real deal.

http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

4e7ebed4-9c81-4927-b26e-02808a82acff.jpg

May 10, 2016 | Jeep Cars & Trucks

1 Answer

Front hub on landcruiser wont disengage


what are you lamps doing, 4wd/awd lamps.????
working FSM free, no book?
no online account at alldata.com?
in the FSM read the section called.
transfer system and inspection there.
4wd and AWD
transfer shift motor>? checks
NEUTRAL POSITION DETECTION SWITCH
CENTER DIFFERENTIAL LOCK DETECTION SWITCH
if the lamps, show its locked and you have it off
then it is locked,
and the motor failed or the controls to it failed.
the FSM covers all this and is not simple by any means.
i drive jeeps, and mine are all manual.
the fsm has a table for failures.
here is yours?
Does not switch to neutral?
CAN communication system (scan the PCM for errors)
Four wheel drive control ECU
Transfer position switch
Transfer shift actuator
Transfer faulty

there are 6 switches
4wd ECu
and the motor. to make it happen.
SCAN it.

Feb 20, 2014 | 2008 Toyota Land Cruiser

2 Answers

Tires changed and now 4wd lock flashing


Did you have same size tires put on ? With the light flashing there is a DTC'S - diagnostic trouble code stored , have to have diagnostic tool hooked up . That's the only way your going find out what the problem is .

Jan 16, 2013 | 2007 Mitsubishi Outlander XLS

1 Answer

My 98 f150 was in 4WD Hi this morning when I started it. Selector switch is in 2WD position. 4WD Hi light is on, hubs (or front differential) is engaged and transfer case engage. (Feel front wheel hop...


If the switch was in the 2WD position and the transfer case was locked in a 4WD range, my 2 SWAGs would be bad switch or the connector to the shift motor is damaged / corroded or the fuse to the transfer case shift relay module is blown ( fuse # 17 ) / problem with the transfer case shift relay module.

This is without knowing if the truck was used in 4WD the night prior, and shifted out just before turning off. If this is the case, the shift motor might be stuck, and a few hits with a dead blow hammer to the transfer case might jar it free again ( do not use a metal hammer, it could damage the transfer case ).

The vacuum shift solenoids on the firewall are controlled by the GEM ( Generic Electronic Module ) which is grounding either the 2WD or 4WD solenoid, depending on the shift plate contacts in the transfer case. ( when in 4 or 4H, the contact switch plate signals the GEM, which in turn grounds the correct solenoid ).

Pulling the switch will not cause the transfer case to go back to a default position, the switch has a resistance level for each mode, and needs that value to operate the shift motor.

The resistance values for the switch between the 2 dark blue wires:
2WD - 4100 to 3700 ohms
4H - 1050 to 1150 ohms
4L - 380 to 340 ohms
- find the wire locations on the switch, mark them and remove the connector to test the resistance.

Just my opinion on the order :

1. Check the fuses for the shift motor
2. Try the old school shift method, back up ~ 50' put into park or neutral, and shift from 4WD to 2WD.
2.1. This is to see if the transfer case shift motor is bound up, and reversing might release it
3. Try hammering the transfer case with a dead blow hammer while someone shifts from 2WD to 4WD. You only need the key in the run position, if it happens quick enough after running the engine, the vacuum reservoir will still have enough vac to operate the solenoids. Don't chance running yourself over.
3.1. If this frees up the shift motor and the vacuum has bled off, you can try starting the truck and shifting into 4H then back to 2WD to get the front axle to disconnect or manually vacuum operate the front disconnect motor by applying vacuum to the pink vacuum line on the shift motor on the front axle.

Mar 05, 2011 | 1998 Ford F150 Regular Cab

1 Answer

HOW TO SHIFT TO 4 WHEEL DRIVE


Hi - Here is instruction how to do.

From N to 4H

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to shift into "4H".

From 4H to 4H LOCK

You can operate the transfer switch either

when the vehicle is stopped or while the

vehicle is moving.

Position the front wheels straight ahead

and turn the switch to shift into "4H LOCK".

If the vehicle is moving, we recommend

that the speed be less than 100 km/h (60

mph) during this operation.

NOTE:

• When shifting between the transfer

switch position and the transfer gear

position is unmatched, all 4WD indicators

will blink and the buzzer will sound.

• If it is difficult to shift between "4H" and

"4H LOCK" while the vehicle is moving,

try accelerating and decelerating your

vehicle several times after turning the

transfer switch. Be sure to wait until traffic

conditions allow you to accelerate and

decelerate safety before using this procedure.

From 4H LOCK to 4L LOCK

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to shift into "4L LOCK".

From 4L LOCK to 4H LOCK

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to shift into "4H LOCK".

From 4H LOCK to 4H

You can operate the transfer switch either

when the vehicle is stopped or while the

vehicle is moving.

Position the front wheels straight ahead

and turn the switch to shift into "4H". If the

vehicle is moving, we recommend that the

speed be less than 100 km/h (60 mph) during

this operation.

NOTE:

• When shifting between the transfer

switch position and the transfer gear

position is unmatched, all 4WD indicators

will blink and the buzzer will sound.

• If it is difficult to shift between "4H" and

"4H LOCK" while the vehicle is moving,

try accelerating and decelerating your

vehicle several times after turning the

transfer switch. Be sure to wait until traffic

conditions allow you to accelerate and

decelerate safety before using this procedure.

From 4H to N

64J209

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to the mark (1) at the left of the "N"
position, and hold the switch in this posi-

tion for 5 seconds until the "N" indicator

blinks, then turn the switch to the "N" position.

When you turn the transfer switch to the

"N" position, "N" indicator will come on with

the buzzer sound.

CAUTION

• Be sure to stop the vehicle completely

before operating the transfer

switch to shift between "N" and

"4H", or between "4H LOCK" and

"4L LOCK".

• Do not shift between "4H" and "4H

LOCK" unless the front wheels are

in the straight-ahead position and

we recommend that the vehicle

speed be less than 100 km/h (60

mph).

Do not operate the transfer switch

while tires are racing.

• Do not operate your vehicle in "4H

LOCK" or "4L LOCK" on dry, hard

surfaces.

(Continued)

CAUTION

(Continued)

• Do not operate the vehicle while a

4WD mode indicator is blinking

except when shifting between "4H"

and "4L LOCK".

If you operate the vehicle while a

4WD mode indicator is blinking, a

buzzer will sound and the transfer

will shift to "N" (Neutral) to prevent

transfer case damage.

In this case, use the following procedure.

1) Depress the clutch pedal fully (if

equipped) or shift the automatic

transmission gearshift lever to the

"N" position.

2) Turn the transfer switch to the

position previously selected.
3) Operate the transfer switch again.

Feb 01, 2011 | 2007 Suzuki Grand Vitara 4WD

1 Answer

How do i lock in my 4wd on my 1989 jeep cherokee?


They shouldn't have any amnual hubs in the fornt axle. You simply have to shift into "4HI" position and its locked in. Some have a part time 4WD position but its not locked in 4WD all the time. Older models you had to turn a lever on both front wheels to lock. Some models its a switch on the dash to engage not a lever in the floor.

Jan 30, 2011 | 1998 Jeep Cherokee

1 Answer

How to put a 95 or 96 jeep cherokee sport in 4 wheel drive. handle is left of the gear shift.


You can change on the run but as a general rule stop to change to 4wd.except 2wd to 4wd high.Just slow down to about 15mph and back off the gas.
2wd high is normal running
4wd high(is full time 4wd)this is slippery roads or muddy roads.
4wd high lock For bad and slower slippery and rocky roads.
4wd low lock is for extreme 4wd conditions
Don't use the last 2 on the main roads or transfercase will be damaged
Hope this helps

Dec 03, 2010 | 1995 Jeep Cherokee

1 Answer

Cant turn on 4wd


Have you checked if the problem is with the front hubs or with the transfer case ?
Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc ).
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

Next with the truck running, have someone turn the switch to 4WD, and you should see the shift motor diaphragm move
db3e24b.jpg

If not, could be the shift fork is stuck ( try manually moving ) or cold be a vacuum leak back to the vacuum shift solenoids
a6ef351.jpg

You can remove the 4WD mode switch, and test the resistance on it ( this is also the vacuum line routing )
1d66749.jpg
You might find moisture in the vacuum shift motor diaphragm, not allowing the vacuum to operate it correctly.

Jan 07, 2010 | 1997 Ford F150 Regular Cab

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