Electric 4WD selector switch on dash does not select/deselect 4WD. I wish to manually shift the selector at the gearbox if this is possible.
The electro/pneumatic 4WD switch is not operating on my 1999 Isuzu NPS 300 so I cannot shift into and out of 4WD using the dashboard switch. Is it possible to manually shift the selector at the transfer case? I expect the solenoid at the transfer case is not working and in an emergency I would like to be able to transfer the drive.
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Re: electric 4WD selector switch on dash does not...
By swapping vaccum hoses on front diff shift on fly unit you can get out of 4wd or vise versa or by removing and sliding sleeve ring inside diff tube over, check range selection detent switch on this unit it is a on/off switch.these fail often
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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
Have it check for DTC'S - diagnostic trouble codes ?
You can now see the axles themselves and try to rotate them manually. While engaged in 4wd - they should not move more than a 1/4 turn. If both move free your diff or transfer box are bad, depending whether you see the front driveshaft moving or not. If drvshft is moving - transfer is bad. If not - the diff is gone. If only one is free - your axle is broken. Not a biggie to diagnose but one hell of a pita to fix... I'd advise you to head to the shop and and have a pro fix it. Cheers emi
Well it could be the selector switch, but I doubt it. Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities. The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash. You should be able to have a shop scan the body computer for trouble codes and proceed from there. A basic code reader may not access the body computer.
This is very strange because of How the low range is engaged. I drive a 1999 F150 4x4 which has the same dash and controls for the 4x4 as your Expedition. I do know that the fan control switch is unfortunately the same shape and very close to the 4x4 switch. It is easy to grab the wrong knob and turn the wrong thing than was intended.
My initial impression is if it is possible, your girl could have reached over to move the fan switch and actual grabbed the 4x4 switch instead. Or you were warming up the Expedition and meant to turn up the fan and instead turned the 4x4 switch to Low. Or a backpack she was moving with schoolbooks could have hit the switch. What puzzles me is that to go into Low range, you need a foot on the Brake and simultaneously need the gearshift in Neutral and the 4x4 selector in Low. That is 3 things to make the low range happen.
Even if your foot was on the Brake and the sensors caught the gearshift going through Neutral on its travel to Park, the 4x4 Selector would have to be in Low. There is one problem you can have with the 4x4 Selector.***The Selector has 3 Resistors and a LED bulb.***
You stated the Selector switch was good. This would mean there were 3 different Voltages under the vehicle. Sometimes when the LED bulb burns out, it shifts the Voltage out of range for the Servo, and although the Selector says one thing, the Voltage at the Servo has the wrong value for that function. Since the dash light and the Servo agree on Low, it would seem the Selector is out of sync with the other 2 parts.
I hope my solution is very helpful in solving your problem.
Do you have the extra shift lever on the floor or the "shift on the fly" electric selector? My 1999 only needs to be put in Neutral(with brake pedal pressed) for the Low range and the shift from 2wheel drive to 4wheel high is seamless with the Electric selector.
You might try putting the truck in reverse for a couple of feet, then to Park, and back to Neutral or Drive. Then use the Electric selector. Your year model may require a foot on the brake.
Ford has a style of selector that uses 1 wire to the Shift servo for all the drive ranges. There are resistors in the selector switch with each position making a different voltage. If the LED backlit bulb in the selector is dirty, it can throw off the voltage. I understand that the best access to the selector switch is through the opening for the radio. Once the radio is removed there are 2, 1/4inch screws holding the selector to the dash.
You can replace the selector or attempt to clean it as access is possible by removing 3 clips on the part. This made the LED changeable by providing access. There is a spring and checkball which makes the selector click into place and stay where you put it.
You can also try to clean the connections on the plugin for the selector with Electronics spray. Thats all you may need if you can jockey around the spray can to squirt the terminals on the selector switch.
With luck, my opening instructions may solve your problem. It is possible your mechanical shift linkage for the Park,Reverse,Neutral,Drive has too much play in it and an interlock is just not lining up. If you have another type of 4x4 with the extra lever on the floor there are different instructions.
I hope you feel my information was very helpful and complete. You can contact us again for more help.
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
Solution at hand. I chased the harness to the gearbox. I methodically electrically earth tested each wire-to-switch and visually checked each wire for breaks whilst another kept turning on and off the 4wd switcth on shift. Eventually, at the rear end of the gearbox there is a multi connector of some several wires. One end had a female and the other exposed male pins. On counting the pins I noticed that one pin, on recollection green/red wire had been drawn back into the connector so not making a contact. I therefore, pushed the pin back through so to make a connection. All of the 4wd pneumatics, light on dash and front axles switches now work. That one wire caused total shutdown of the High 4wd system. I assume that during either off-roading or average road use an object, like a branch, fouled the rear connector and dislodged the wire connection.
Thanks for your quick response. Hope the above will help someone in the future.
possible range selection detent switch not working causing to get stuck some times in one range only and wont shift to other range 4wd light in dash just keeps flashing for about 10 seconds then goes to previous state this then can jam up 2wd 4wd lever that you then cannot move.
there are 3 switches 2 on trans/transferr case, 1 on front LH diff axle tube actuator (shift on fly). can cause damge to the electric actuator then on transferr case.
suggest you get a dealer to look at or some one that knows this system. is also vaccum operated on front diff shift on fly unit and there were 2 different systems fitted to these vehicles push button 4wd on dash and lever next to gear lever which i take is yours