Question about 1998 Isuzu Trooper

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The shift-on-the-fly gear is not engaging. the indicator lamp lights up on turning the ignition key and goes off when the engine starts but during running, engaging the lever does not bring the lamp on and the 4x4 system is not engaged. I've been told its an electrical not a mechanical problem

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  • 235 Answers

What year is the car as the sotf systems vary a bit ?

Posted on Sep 26, 2009

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2003 Silverado 4WD. Service 4WD dash light comes on after engaging 4WD and acts up by engaging itself randomly for several days, then goes back to normal.


Check connection at the 4X4 control module , check power and grounds . Do you know how to do basic electrical testing ? Does your truck have manual or automatic trans mission ? Which transfer case does yours have ?

The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module (TCCM) starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the TCCM has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been engaged. Once the new mode/gear position is fully active, the switch indicator for the new position remains ON constantly. In the event that the TCCM can not or will not complete the shift, the indicator returns to the previously selected position; this is a Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode condition.

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
• Neutral
Have it check for DTC'S - diagnostic trouble codes ?

DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0359
DTC C0379
DTC C0550

Your best bet would be take it to a qualified repair SHOP

Dec 28, 2016 | Cars & Trucks

1 Answer

I can here the tranfercase locking in but its not turning front tires at all ?


Your vehicle had option of two different 4x4 systems ,
New Venture Gear 263 Selectable Two Speed Transfer Case
The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the vehicle has the ignition key in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position will begin flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp will continue to flash until all shifting criteria has been met and the new mode/gear position has been reached (or has been engaged). Once the new mode/gear position is fully active, the switch indicator lamp for the new position will remain ON constantly.
The NVG 263 transfer case provides the driver with 3 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
OR
The NVG 236/246 transfer case features a 4 button shift control switch located on the instrument panel. When the vehicle has the ignition key in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position will begin flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp will continue to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has been engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position will remain ON constantly.
If there are problems with electronic part of the systems the shift control switch light will flash warning of a problem , If no lights you have a mechanical problem in the transfer case itself .
The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator motor consists of a Permanent Magnetic (PM) motor, a worm gear controlled plunger, a front axle switch and an electronic control circuit all within the actuator assembly.
The front axle actuator has four circuits connected to it, a front axle feed circuit, front axle ground circuit, front axle control circuit and a front axle switch circuit.
Whenever a shift to AUTO 4WD, 4HI, or 4LO is requested, the transfer case shift control module engages the front axle by grounding the front axle control circuit through a current limiting driver. Test Description
The numbers below refer to the step numbers on the diagnostic table.
Tests the electrical function of the front axle actuator. Helps determine between mechanical and electrical malfunctions.
Tests for proper power and ground at the front axle actuator.
Tests the operation of the front axle control circuit.
Helps determine if the transfer case shift control module is able to monitor the front axle switch.
Tests the front axle switch circuit for an open or high resistance.
Measures the voltage between the front axle feed circuit and ground.
Tests the front axle control circuit for an open or high resistance.
Inspects the front axle for a mechanical malfunction.
Tests for open in the front axle feed circuit.

Feb 14, 2016 | 2001 GMC Yukon

1 Answer

Key turns goes in gears but will not try to start steering will not lock


ok, what transmission you got?

mines a Manual trans (stick ) is yours. you said GEAR
so that implies you shifted it, and not IT shifting it for you. (auto)
battery =bat, full as in charged to 12.6vdc rested?
for get steering locks for now, lets work key on position.
first off: do head lights work?> not dim
keyon,, do all warning lamps glow, now, they must this is self test on them.
does the CEL glow,? check engine light , if not fuses blown to PCM.
is the Immoblizer light glowing< yes, then you HAVE THAT.
so depress the clutch pedal (gears in neutral on stick)
this allows the starter to work.
you turn the key and the starter spins fast and so does
engine crank shaft, does it?
more later if you get this far......

if only i knew what Goes in gears means?

Feb 24, 2015 | 2005 Suzuki XL-7

1 Answer

Please can you help me?my car is a bmw320cd [55 reg] and the light on the top right of the dashboard keeps coming on. it goes yellowthen red. it looks like a line with a squigle going through it and has...


rough edged circle with exclamation point in it is illuminated
Automatic transmission
The transmission has responded to a malfunction by reverting to operation in its emergency default program. Please consult the nearest BMW center.
For additional information: refer to page 59

(page 59)
Electronic transmission control module
If the indicator lamp comes on, there is a malfunction in the
transmission system.
Bring the vehicle to a stop. Move the transmission selector lever to "P."
Engage the parking brake and turn the engine off (ignition key to position 0).
Wait a few seconds, then start the engine.
If the indicator lamp goes out after a few seconds, normal transmission performance has been restored. You may continue to drive as usual.
If the indicator lamp does not go out, you can place the selector lever in all positions. However, the vehicle will now only operate in 3rd and 4th gear.
If this happens, avoid extreme engine loads and consult the nearest BMW center. hope this helps you to aviod ruining your vehicle

Aug 06, 2014 | 2005 BMW 320Cd

2 Answers

My stater is free,spinning thn grindingmon the stop but it doesnt do it all the ti,me but is slowly getting worste its a 2001 z3 roadster 3.0im i replaced the crank positioning sensor but did nothing...


replace the starter and the flywheel-the bad starter has not engaged the teeth on the flywheel fully and has ground some teeth off so you'll fit that space every once in a while-cheers Denny

Oct 31, 2013 | 1999 BMW Z3

1 Answer

It will not go into 4wd but i can here it click and you can see on the dash it show 4wd


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

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.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system
sscullys_45.jpg

If the indicator light on the cluster is illuminating, I would suspect that the transfer case is fine ( shift motor plates are making contact, singalling that the shift happened with the indicator on the cluster ), so when you jack up and test, look towards the vacuum lines & IWE solenoid.

Dec 17, 2010 | 2005 Ford F-150

1 Answer

4x4 not working on my 2002 chevy blazer ls 4.3l replaced the in dash switch and the tcm and the encoder motor what eles can be the issue when it went out it clicked when i switched into 4x4 then down the...


Is the switch lit up , light flashing ? Did you have the system checked for DTC'S - diagnostic trouble codes . Should have had this done before replacing parts . TCM ? your replaced the transmission control module ? Or the transfer case shift control module ? If no codes ,check B+ power and grounds for the control module . Find a wiring diagram so you know which wires are what etc.....Videos on youtube on basic automotive electrical testing , testing inputs an outputs for control modules . This system can set a number of codes !
DTC B2725
DTC C0300
DTC C0305
DTC C0308
DTC C0309
DTC C0310
DTC C0315
DTC C0323
DTC C0324
DTC C0327
DTC C0362
DTC C0367
DTC C0374
DTC C0376
DTC C0387
DTC C0550
DTC C0611

The front axle control circuit consists of a Front Drive Axle Clutch Solenoid which is electronically controlled by the transfer case shift control module. This solenoid opens and closes a vacuum control valve allowing vacuum to apply and release a clutch pack inside the front axle housing. The transfer case shift control module determines whether or not the clutch pack has been applied or released based on a signal from the front axle switch mounted on the front axle housing assembly. The front axle is normally locked or engaged during AUTO 4WD, 4WD HI, and 4WD LO modes. The front axle is unlocked or disengaged only during 2 HI or neutral modes.

The NVG 236/246 transfer case features a 4 button shift control switch located on the instrument panel. When the vehicle has the ignition key in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position will begin flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp will continue to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has been engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position will remain ON constantly.

The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch, to determine if a new mode/gear position has been selected. At a single press of the transfer case shift control switch, the lamp of the new position begins flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.

Which 4X4 system does your's have ? Three or four button ?

Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
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Jul 04, 2017 | 2002 Chevrolet Blazer

1 Answer

Trans drops into 3rd gear won,t shift to 4th


DTC P0734 is "4th gear incorrect ratio" - that's your torque converter 'LOCK UP Clutch" It's worn out (or you're using the wrong Trans Fluid required by Hyundai - SPIII OR Both). The P1624 is simply the Trans Control Unit (computer) communicating to the Engine Control Module (ECM computer) MIL - on request signal to ECM = asking it to turn on "Check Engine" light. MIL = Malfunction Indicator Lamp. When the torque converter 'lock up" clutch slips or doesn't engage, the trans automatically returns to 3rd gear and stays there (it's called 'fail safe' mode) until you cycle the ignition key, then everything resets until the malfunction occurs again.
You'll need to have an AT (Automatic Transaxel) tester hooked up to verify this. Hyundai has a Service Bulletin specifically for "gear incorrect ratio' codes. If when you changed the trans fluid, was it done at a Hyundai Service Center? If not, someone may have installed the wrong fluid.

Jun 01, 2009 | 2000 Hyundai Elantra

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