Solving Transmission Problems Stuck in Gear Hard or NO Shift

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Solving Transmission Problems Stuck in Gear Hard or NO Shift

Unread postby Wanderer » Fri Jun 14, 2013 9:00 am

The transmission light on or stuck in 3rd gear problem is common in our LeSharos and this post will show the steps you should take to resolve the problem.
First things first.
The LeSharo has a transmission light on the dash that should turn off within seconds after the vehicle starts driving. In some later models the light turns off after the vehicles starts. If the transmission computer has failed or is not receiving power it could due to a blown fuse, or poor connection at the fuse panel terminals, or a poor ground connection. When the transmission computer is not working the transmission stays in third gear (limp mode) so you can drive the vehicle to safety. If your light stays on or the vehicle is stuck in a high gear read the post below.


Check the transmission fuse in the fuse panel under the dash on the driver’s side for a poor contact.

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If the fuse is good and after you have cleaned the fuse and the fuse holder contacts: Clean the leads from the transmission module that is located under the hood on the drivers side front mounted on the side of the radiator support, in particular the single lead after the connector that has a tendency to corrode at the black plug.
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Finally check the ground for the multi-switch ground connection. It is located on the transmission study the pictures so you can find it.
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This is the schematic for the Transmission Multiswitch: Note that the number 3 terminal (BROWN WIRE) marked "Earth" is the Ground of the vehicle that leads to the NEGATIVE terminal of the battery:


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If you think the multi switch is defective here are instructions on how to by pass the multi switch by John Ferguson:
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NOTE: The diode used is a 2 amp diode although two 1 amp in parallel will work, the diode will have a white or grey band (as in the illustration) you must install it with the white band towards the blue cable. John Ferguson set up the switch, he felt that 1st gear on the LeSharo was not needed on a level ground start and that you should use 2nd and third gear under normal conditions, the transmission shifts feel normal when using the switch and you decide at what rpm to engage the gear. The switch itself is a single pole double throw switch (three positions up, center and down) that is rated at 5 amps or greater. I suppose you can configure the switch to change gears in the 1-2-3 order by getting the proper switch and wiring it accordingly.

Instructions for installing LeSharo automatic transmission test switch. by John Ferguson

1. Locate hole 2" to left of top of gas pedal arm. It probably has white goop of some type and a twisted pair of wires (blue and grey). Open the hole up enough to thread the three switch wires through. (yellow, blue and brown). If installed, remove heater fan inlet snorkel.

2. With key switched on, do you have a trans light on upper right of instrument cluster?
a) if yes, switch off ignition and remove both (6pin and 3pin) plugs from Renix box. (the Renix box is located directly behind where you add brake fluid to the brake master cylinder)
b) if no, do the procedure in a. and then replace the Renix fuse in the fuse panel below and to the left of the steering wheel. The fuse panel pries open from the top and the Renix fuse is the third one down from the top on the right. (black phenolic holder with special little glass fuse) There are two spare fuses taped to the ground wire in the kit. (green)
I suggest doing it this way because if the fuse is blown, we want to unplug the Renix box so we don't blow it again before we get the switch plugged in.

3. Plug the yellow wire from the switch into the top (yellow) pin of the 6 pin plug.

4. Plug the blue, brown, and green (ground) into the three pin plug.

5. Attach the ground alligator clip to ground connection just below and to the right of the right of the Renix box. (or any suitable ground)

6. If you still have the starter relay enabled (many do not) you will need to bypass it as it gets its power from the renix box. Follow the cable from the six pin plug and just below it you will find the starter relay or its socket. If there is no socket and the largest of white wires are shorted together; the relay has been eliminated. If there is a socket (as shown in the following diagram) and it is jumpered from 3 to 5, the relay has been eliminated. If the relay is still there, remove it and use supplied jumper (white) between 3 and 5.
Note!! The starter will now work in any shifter position. Be Careful!!

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7. "Lock and Load" it's Showtime! Give it a try.

8. Select drive on the shifter (or other forward gear if drive does not work) and 1 on the switch and you should take off in 1st. Leave the shifter alone and select 2 on the switch and you should at that instant shift to 2nd. Move the switch to the middle and you should have third. I suggest for reverse, moving the switch to 1 and then selecting reverse with the shifter. When slowing or stopping in drive, the switch can be left in 3 till stopped.

Things to know! If you have no forward movement (drive), the switch will probably do nothing for you. If your switch doesn't appear to do anything, check for 12v at yellow wire at the top of 6 pin plug. Check the fuse. Check for a good ground.

If these steps do not work you may have a bad transmission module or a faulty transmission, however these measures will usually correct the problem.
Trafic


The switch does not provide any power in the center position, this why when the transmission fuse blows or makes a poor contact you loose your shifts and only have third gear as a fail safe device to get you home in case the transmission module or solenoids fail. Even if you do not have a tachometer you can hear and feel the engine at its optimal power output (the technical term is seat of the pants shifting :lol: ).

The bypass switch in the diagram manually controls two electrically activated solenoids that operate two valves (one for each solenoid) in the transmission that divert the flow of fluid to select the drive gear; when you are in 3rd gear there is NO POWER to the solenoids. When you apply power to the second electric solenoid (EL2) you divert the fluid to engage the free wheel (RL) and to the first Clutch (E1): this combination is first gear. When you apply power to both electric solenoids (EL1 and EL2) you divert the fluid to engage the first Clutch (E1) and brake2 (F2): this combination is second gear . If the solenoids have NO power then clutch 1 (E1) and clutch 2 (E2) are engaged; this combination is third gear. The diode is there to allow electricity to flow only in one direction so you isolate the use of the solenoids with the switch.
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Hard Shifts / No Shift / Harsh /Erratic/ Downshifting no passing gear.

A little more on the operation of the transmission shifts: The gear engagement is induced mechanically by the shifter and electrically by the solenoid valves. The transmission module sets the shift points and passing gear in conjunction with the kick down switches (micro switch) one that is located on the accelerator linkage and a second switch that is located on the accelerator cable sleeve at the firewall on the engine side where the cable enters the vehicle. It also receives information from the engine revolutions, speed sensor, throttle position sensor and brake switch to determine downshifts and smooth gear engagement. If any of these components fail you will have erratic transmission shifts or sudden increase or decrease in engine revolutions. In an emergency you can by pass all this processing power with the switch as described in the post above.

Here is a picture of the micro switch on newer 1988 to 92 LeSharos. The earlier units have it mounted on the throttle linkage on the intake manifold, just follow the purple wires.

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All LeSharos regardless of year manufactured have a second micro switch built into the accelerator cable that is mounted at the firewall. This switch is grounded when the accelerator cable is pushed to the floor

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[imghttp://www.lesharorv.com/gallery/albums/userpics/10456/SOLENO.jpg[/img]

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Last edited by Wanderer on Fri Jun 14, 2013 9:00 am, edited 1 time in total.
Lou
Life is hard by the yard; but by the inch it’s a cinch.
1990 Winnebago LeSharo "Wanderer"
Chrysler 3.3L Extended roof
Delray Beach Fl
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby jeffumbarger » Sat Nov 30, 2013 3:38 am

I think my tranny pump lost prime! ....how do I fix? Thanks all
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby jeffumbarger » Sat Nov 30, 2013 1:10 pm

Will it not engage into gear if I'm low on final drive oil or gearbox oil? EVERY time u cold start it, it works fine! I can reverse down my drive...put it in D and can go back up it! But once u put it back in park it revs high n can no longer put it in gear!.....ANY gear!
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby Rick H » Sat Nov 30, 2013 6:55 pm

Jeff,
The final gear oil level will make no difference to performance in the short run. If your automatic transmission fluild level is low, it may perform as you have described.
Start the engine in Park and check the fluid level and fill as needed. Also when checking the level observe the colour and smell, should be red and no burnt smell.
Btw what year is yours?
Hope it helps,
Rick
Rick and Cathy from Blenheim, Ontario, Canada
88 LeSharo 2.2L gas auto

We drive in 'NANAZBUS'.
Our grandchildren love it.
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby jeffumbarger » Sat Nov 30, 2013 9:23 pm

ATF is full! Wrks perfect when u first start it...can select any gear, then eventually goes to a high idle n nothing!!!!
..every gear is like your in neutral!
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby jeffumbarger » Sat Nov 30, 2013 9:26 pm

1987
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby rredwine » Thu Sep 29, 2016 9:04 am

dose any one have photos\diagram of by pass switch set up
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby Wanderer » Thu Sep 29, 2016 9:04 am

rredwine wrote:dose any one have photos\diagram of by pass switch set up

send me your email address.
Lou
Life is hard by the yard; but by the inch it’s a cinch.
1990 Winnebago LeSharo "Wanderer"
Chrysler 3.3L Extended roof
Delray Beach Fl
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby MJonFire » Sat Jan 28, 2017 5:38 pm

I'm also seeking schematics / missing diagrams from this post.
Any help is appreciated.
Thanks.

-MatthewJamesFire @ Gmail .com
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Re: Solving Transmission Problems Stuck in Gear Hard or NO S

Unread postby techbull » Fri Sep 01, 2023 3:08 pm

Someone can send me the schema of the switch ?
missing pictures ...
emmmob @ hotmail.com

thank you
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