Tyre pressure monitoring system fault

[badgx]

There is one more transponder to the rear right side, hidden behind the splash back, which takes the average to the rear sides. To be sure it might be worth try rotate the rear wheel to the front to check to see if it made any difference, it won't cost

[neo2]

yeah will try swopping the wheels round front to rear and visa versa and see if the problem moves to the front good point that...

[chrisp]

Originally Posted by neo2

yeah will try swopping the wheels round front to rear and visa versa and see if the problem moves to the front good point that...

I note that you have fitted a rubber stemmed one. The correct no for the rubber stemmed ones is 56029481AA these will work i have four fitted to mine. You can get rubber stemmed ones off ebay etc from the states with 433mhz stamped on them part no 56029398AB and they dont work on euro spec cars. I and a few others bought these and got caught out. I would check the part no on the one you have bought. Tpms update !!

[devilmaycare]

Originally Posted by badgx

There is one more transponder to the rear right side, hidden behind the splash back, which takes the average to the rear sides.

I don't understand what you mean by this. There are three "transponders" used to locate the positions of three wheel sensors, with the fourth position deduced by elimination. I'm not aware of any "averaging" process.

[badgx]

Yep, I had to check that, was thinking of something else but its done by a process of elimination theory

This is the text
The Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM), uses transponders (trigger modules) located in three of the four wheel wells on the vehicle to provide it with the location of the tire pressure sensors on the vehicle. The WCM receives RF signals from all four rotating wheel speed sensors. When the WCM needs to know which sensor is located at a particular location on the vehicle, it directs the transponder at that location to send out a low frequency signal to excite the nearby sensor. The WCM then receives that excited signal and knows where that sensor is located. This auto-locating process only happens in the first 10 minutes of any WCM cycle while traveling at speeds above 20 mph (32 km/h) (Each WCM cycle ends when the vehicle has been shut off for a time period of approximately 15 minutes or longer). Once the WCM has performed this to the three locations that have transponders (left front, right front and right rear wheel wells), it uses the process-of-elimination theory to know that the fourth sensor ID signal is coming from the left rear tire sensor.

[neo2]

i let the n/s/r tyre down to flat started the engine then bother rear tyres were flashing on the dash display as being 0.0 bar and then blew the tyre up from totally flat to correct pressure, drovers rear tyres recorded straight away as that had not been altered and with the nearside rear tyre back at correct pressure i too the 300c for a about 7/8 mile drive and its still not recording any pressure, that evwn with the new sensor in it....

Rob

[badgx]

Rob, have you tried rotating by moving the rear wheels to the front axle and the front wheels to the rear axle as suggested to see if it made any difference? You know 100% the front sensors are working, do a swap test to see, you can put them back afterwards

[neo2]

Hi guys a quick update this is getting on my nerves now this tyre capper..

Ok Nearside rear tyre warning is on 0.0 bar in screen display all other 3 tyres working great....

1. Fitted a new tyre valve sensor made no difference still 0.0bar on nearside rear tyre at 36psi in tyre...
2. drove it 12 miles still no change
3. deflatted tyre to completely flat started engine blew back upto 36psi still not reading nothing 0.0 bar
4. drove 12 miles again no change
5. swopped wheel off nearside front as i know it worked to nearside rear and vise versa expecting the 0.0bar reading to go to the front, but it never nearside rear wheel still showing 0.0bar
6. tried driving did 2 x 20 mile round trips still showing 0.0bar on dash

So its looking like its nowt to do with the wheel sensor then ???

I did notice when i let all the air out of the nearside wheel when it was totally flat both rears were flashing on dash for some reason soon as i blew it though 4 miles down road right rear stated working nearside rear nothing ???

An ideas chaps ?????

[badgx]

Sounds like your sensors were OK from the start, would have saved yourself some trouble if you had rotated the wheels to the front as originally suggested. Keep the old sensor as a spare if you still have it though

Next step, check connection the the transponder module, which is located to the rear right wheel arch behind the plastic splash back. Unfortunately there is no way of testing this component, you only have the option of replacing it. I have listed a breaker on the link below, you may want to enquire on the price delivered to your home.

To gain access to this component, your rear right side wheel needs to be removed, then using a flat head screw driver you need to undo the plastic self tapping screws, there are several that hold the splash back to the wheel arch. You will also meet 2 or 3 mini hex type bolts, screwed to the rear bumpers, they might be corroded so do spray some WD40, which will make it easy to unscrew.

This ^^^ will be the final step at DIY level. After tackling the transponder to the rear, if no improvement then the fault is somewhere like up front i.e. the SKREEM and that my friend is not a DIY fix because the vehicle will need to be taken to the dealership.

Here the link

http://www.charltonautoparts.co.uk/used-chrysler-parts/

[devilmaycare]

It looks as if the SKREEM is failing to deduce the position of the fourth sensor in the wheel arch without a transponder. It does seem odd though, that such a fault could have been triggered by wheel replacement. Have you checked for fault codes? These two could be relevant:

C1509–RIGHT REAR TIRE PRESSURE
TRANSPONDER MODULE
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . .22-44

C150C–RIGHT REAR TIRE PRESSURE
TRANSPONDER MODULE VOLTAGE
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-55