Allpar Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter #1
I have a 2010 Nitro. The tpms indicates the monitor for the left rear is not working so I switched the rear wheels so that side had a known good sensor, and the left rear still has no signal. So I checked for a trigger for that wheel. I found out there are 3 triggers on the car and it uses process of elimination for the fourth sensor. The left rear is the one without a sensor. Anyone have an idea what the problem may be?
 

·
Virginia Gentleman
Joined
·
14,798 Posts
Check the following thread (lots of good information regarding the TPMS):

It finally happened to me, bad TPMS sensor....

In short the WCM (Wireless Control Module) will store any TPMS faults.

Also you may have to drive the vehicle up to 20 minutes before the WCM/TPMS registers the tire change. At least that's what it states in the owner's manual of my 2010 Journey.

FWIW - I had the RF TPMS on our Journey literally disintegrate. Temporarily I had a regular (non-TPMS) valve stem installed. Yes, the TPMS light remained on until I had it replaced when I purchased new tires. Had I replaced it right away it would have been $112 to replace the sensor (parts & labor). Saved $40 by waiting to replace it when I purchased new tires.
 

·
Super Moderator
Joined
·
21,398 Posts
When changing wheel sensor positions on the vehicle, it may take a 10 minute drive (or a couple of miles) over 15 mph to learn the new wheel positions.
The 4th TPMS transmitter is detected by default. The module knows the position of the other 3 sensors by placing the 3 receivers in the wheel wells.
Knowing the fault code from the WCM would help diagnosis. Many good tire stores have tools that can read TPS faults as all vehicles have them now. The dealer may also get you a diagnosis under the minimum shop charge.
 

·
Registered
Joined
·
5,423 Posts
The TPMS module goes through a whole algorithm as a process of elimination to determine which sensor is at which position and to determine which sensors it reads should be registered or not. Remember, it could also be reading sensors of the vehicles parked next to your car as well as your own. So you have to take the vehicle for a drive, and it has to read the same sensors and no others for a certain distance before it will register them.

i.e. from what I read, its possible that if you drove a hundred miles side by side with same vehicle that also had TPMS sensors, your TPMS module still wouldn't register the sensors because of the way it works. But what are the chances of driving side by side with the same vehicle for that long. But, if you live in a high density area with lots of traffic, I could see it taking many times longer than most experiences before the sensors register or TPMS recognizes a tire rotation.

Oh BTW, do you have the premium TPMS, that will display the pressure in each tire? The base system only has a warning light, and only displays a warning light when either 1 or more tires is below pressure or there is a TPMS malfunction. I think the only difference in the systems is the display, cause I have the base system and although the instrument cluster can only light a TPMS warning light, I can hook up my autoenguinity (ultra-capable scan tool) and read the pressure at each tire, and temperature, and more. Regardless, with the Premium TPMS system, that displays pressure for each tire, you can trouble shoot the sensors to confirm you have the right one. You start with the tire you suspect is bad, bleed out air to drop the pressure a good 20PSI, check the display and make sure it reads the pressure drop. Refill the tire and check again and make sure it shows the pressure gain. Make sure each tire is close to the pressure that is on the display.

In my case, the bad TPMS sensor always read the same pressure, regardless of what the actually pressure was in the tire. The erroneous pressure reading was within normal tire pressure, so you wonder how the TPMS system knew something was wrong, there must be a self-test or at least the system is sophisticated enough to recognize the lack of pressure changes in the tire must mean a malfunction, cause tire pressure goes up and down with every drive.
 
1 - 4 of 4 Posts
Top