Hello, i got problem today with my jag. When i start car i got two comunicates, gearbox fault and restricted performance. My Gearshift dont iluminate and i cant change gear from P to any else. Yesterday it was all ok . I got just one OBD code P1643 where can i have to start checking.

 

Suspect #1 is battery. Look at any of the many threads for how to check etc.

Also check the 2 bolts for the trans shift cable - on trans side - are there and snugged up. 8mm hex heads.

 

+1. What he said...

 

U have photo of this bolt? or where they are located? my english isnt perfect
Battery is good, about 13 V

 

Get a proper value - see how using Search.

 

Please look at fuse F15 in the primary junction box. This is just outboard of the US passenger's feet, forward of the door hinge area. If this fuse is blown, the shift indicator lights won't come on and the shift lever can't be unlocked from P.

 

Fuse checked its all ok. OBD Voltage is good too. 12.9 at starting, 14.5 at first time after start, then lower to 13.5

 

You can see the bolts in the video in this thread https://www.jaguarforums.com/forum/s...age-faq-45959/
I think it's the second one.

 

Okay, one more thought. I have a hunch that a bad park interlock solenoid can draw down the power to the indicator lights, but without blowing the fuse. Look at the first post in this thread for the location of this park interlock solenoid, and how to manually unlock it:


https://www.jaguarforums.com/forum/s...solved-150615/



My pet theory is to remove the electrical connector to this solenoid and see if the indicator lights return to normal. If so, the interlock solenoid is bad.

 

Ok, but i my sport mode button dont iluminate too, cant do nothing with J gate like it has no power, i think maybe its something with the big connector to TCM, i got DTC 1643 , and its says is CAN malfucntion TCM To ECM

 

Don't read too much into certain bus faults. Something simple (loose connector like you're thinking, for example) can make a module lose power, and then the other modules report a communication problem with it. Sounds horrible, but is often an easy fix. So check that connector, but I also think the park interlock solenoid could be at fault, too. That's why I suggested to disconnect it and see if the other functions at the J-gate return to normal.

 

I do as u say but when i do like on the video my car wont drive. Like there is no Gear choosen

Edit. It can run very słów and cant accelerate. I Just move like 20 m becouse i dont want to brak gearbox. Its start like from 4th Gear. Or 3rd. I cant normally move Gearknob. It dont iluminate still. Any ideas?

 

refresh

 

More details on P1643 here:


http://www.jagrepair.com/images/Auto..._OBD_II_R2.pdf


For reasons still unknown, the ECM is having trouble talking to the TCM. Is one of these modules bad? Not super likely, as they are generally quite robust.

I'd still lean towards a power supply problem with one of the modules, or maybe damaged wiring in the CAN bus between them.

Don't panic at the thought of damaged CAN bus wiring. It's just a pair of regular wires, used for transmitting packets of data. If one of these wires was physically damaged, say from rubbing against some metal, that could cause the fault you're experiencing. You're going to have to do some investigation to figure this out. I don't have a crystal ball to say your message is caused by wire XXX rubbing against some particular bracket. You'll have to check both wires for continuity end-to-end between the modules, and that neither wire is shorted to each other or to the chassis.

Before digging too deep, I'd confirm that the TCM and J-Gate are both receiving full battery power. Wiring diagrams here, see figure 04.1:

http://www.jagrepair.com/images/Elec...al%20Guide.pdf


Specifically, at the TCM connector, check for full battery power at pins GB2-9 and -14. At the J-Gate, check for power at pin CA245-1. Check the grounds at both connectors, too.

If possible to do so without causing damage, backprobe the connectors while installed and with the ignition turned on. A voltage check under load like that is much more accurate than an unloaded check.

After that, then I'd suggest checking the CAN bus. Details in the wiring diagram linked above, fig 20.1.

 

Also, try searching the forum for P1643. It's a fairly rare code, so not too much to wade through. You can limit your search to just the S-Type, or expand it to cover all models in case there's something similar.

Some results of note:

The sleeve connector inside the transmission:

https://www.jaguarforums.com/forum/s...-p1797-142604/


This thread has two people reporting fixes. The original poster said it was fixed by a TCM reflash, a new battery, and two new coils(?). At post #24, a second guy said his problem was fixed with all new spark plugs and one new coil, but he was also getting a misfire code. No long-term feedback, though:

https://www.jaguarforums.com/forum/s...issues-110700/


Here's a good one, a wire (external?) damaged during a transmission fluid top-off:

https://www.jaguarforums.com/forum/s...-start-214580/

 

I have no battery voltage at GB2 pin 14. On pin 9 i got. Whats now

 

Alright, making some progress. You've got a hard fault to track down, much easier than something intermittent.

Look at the wiring diagrams again, linked in an earlier message. Scroll to figure 04.1. That pin with no power, GB2-14? It is powered via fuse F33 under the hood. If the fuse is good, you will need to check continuity from the fuse block to the transmission connector.

If the fuse and continuity check good, try unplugging the transmission capacitor. If shorted across, this could potentially drawn down the power at GB2-14. The component description says this capacitor is located on the engine compartment bulkhead, but I don't know exactly where.

You are hot on the trail. Keep up the good work, and let us know what you find.

Edit: Which engine do you have? The wiring diagrams are slightly different.

 

Should be 2003 3.0

 

Uff da! I reread the entire thread looking for the engine size, but missed it in the title.

 

Eh it happens to me all the time.