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post #1 of 27 Old 03-28-2009, 04:16 PM Thread Starter
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Mike, I need to get an '08, and now an '09, Service Manual to look for any changes but I feel that this part of the MK's have not changed. Here is the info from the one that I have. My winter or off-road set will be Patriot 16" wheels with the stock sensors just so that I don't have to fool with it. The EVIC is easy to ignore, it will start flashing to show which tire is low each time that you start your Patriot. Just push the button and change the screen. The right side of the instrument cluster will ding and the the little tire icon will stay lit.

OPERATION

NOTE: Premium Tire Pressure Monitoring is the only system used on this vehicle. Because the Premium system is based upon the Base system, both are explained here.

BASE TIRE PRESSURE MONITORING
The tire pressure monitoring system (TPMS) is designed to operate without loss of function for all OEM tire construction for this vehicle. Sensors, mounted to each road wheel as part of the valve stem, transmit an RF signal indicating their individual pressure to a receiver located in the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM). On a Domestic vehicle, the TPM sensor operates on a 315 MHz radio frequency. Export vehicle sensors operate on a 433 MHz radio frequency. These transmissions occur approximately once every minute at speeds over 15 mph (24 km/h).

If the TPM system detects that the tire pressure in any road tire is going low, beyond the Low Pressure (lamp) ON threshold (see placard table below), the TPM system will continuously illuminate an indicator lamp. If a system fault is detected, the indicator lamp will flash on/off for 60 seconds, once every 10 minutes.

If the WCM detects a warning or fault condition at ignition key "on" it will wait ten seconds +/- 10 % before sending the first request to illuminate the indicator lamp. This will assure that the display module has concluded its bulb check period. The display module will request a chime once per ignition cycle for each "warning" or "fault" condition detected. A "warning" or "fault" condition will remain enabled until the problem causing the condition is corrected and removed/reset.

The WCM shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel sensors during both the ignition key "on" and key "off" cycles. The wheel sensor ID’s and the location of each sensor (e.g. Tire 1, Tire 2 etc.) are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required.

The TPM System will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off the indicator lamp until the tire pressure is at or above the Low Pressure (lamp) OFF threshold (see placard table below). The system will automatically update and the TPM indicator lamp will extinguish once the updated tire pressures have been received.

Tire pressure will vary with temperature by about 1 psi (6.9 kPa) for every 12°F (6.5°C). This means that when the outside temperature decreases, the tire pressure will decrease. Tire pressure should always be set based on cold inflation tire pressure (placard pressure). This is defined as the tire pressure after a vehicle has not been driven for more than 3 hours (and in outside ambient temperature). The tire pressure will also increase as the vehicle is driven; this is normal and there should be no adjustment for this increased pressure. For a system fault, the system will return to normal once the WCM receives a valid transmission from that sensor location.

PREMIUM TIRE PRESSURE MONITORING
The operation and lamp/chime strategy of the Base Tire Pressure Monitoring System (TPMS) also applies to the Premium TPMS, but the premium TPMS can display text messages and a tire pressure graphic display on the information cluster. If a low pressure condition is detected, in addition to a chime and indicator lamp turning ON, the Electronic Vehicle Information Center (EVIC) will show a graphic display of the pressure value(s) with the low tire(s) flashing. Once pressure in the suspect tire raises above the Low Pressure (lamp) OFF Threshold (see placard table below), the lamp will go out once the WCM receives a valid transmission from the sensor. If a system fault is detected, in addition to a chime and a indicator lamp flashing, a “Check TPM System” text message will be displayed in the instrument cluster, and the tire pressure graphic display will have “- -“ in place of the pressure value. The system will return to normal once the WCM receives a valid transmission from that sensor location.

The Premium TPMS determines the location of the tire pressure sensors by using transponders located in three of the four wheel wells on the vehicle. A fourth transponder is not necessary in the remaining wheel well due to the process of elimination theory. Once the system knows the location of the first three sensors, it assumes the location of the fourth tire pressure sensor, and updates the graphic display when necessary.

For both the premium and base TPM, the recommended "Placard Pressure", "Low-pressure Threshold" and “Hysteresis Pressure Values” for the tires installed on the vehicle, are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required. To determine the pressure thresholds for a vehicle, refer to the Tire Inflation Pressure (Placard) Label, and then apply the placard pressure to the following table. The Low Pressure OFF Threshold is defined as the Low Pressure ON Threshold plus the Hysteresis Pressure Value.

For further information, refer to the Owners Manual or the Appropriate Diagnostic Information.


Attached Thumbnails
TPS Threshholds.JPG  

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post #2 of 27 Old 03-29-2009, 01:25 PM Thread Starter
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TPM Sensors

The following is for information ONLY. Jeep, as every other manufacturer, recommends using OEM parts. Some aftermarket manufactures will make their wheels to accept factory sensors and some will make them to fit only their own sensors and some will make sensors that will duplicate and fit in OEM wheels. You will have to check the wheel/sensor manufacturer for compatibility.

DESCRIPTION
Fig 1. On vehicles equipped with Tire Pressure Monitoring (TPM), one tire pressure sensor (6) is mounted to each wheel (5) in place of the traditional tire valve stem. Each sensor has an internal battery that lasts up to 10 years. The battery is not serviceable. At the time of battery failure, the sensor must be replaced.

Fig 2. The TPM system operates on a 315 MHz radio frequency. The 315 MHz sensors can be easily identified by a white outline oval (black center) insignia (3) on the sensor body.

Fig 3. The Export TPM system operates on a 433 MHz radio frequency. The 433 MHz sensors can be easily identified by either a solid white oval insignia (3) on the body or . . .

Fig 4. . . a solid white oval insignia (3) with 433 printed in the center. The sensors are identical except for the oval insignia. The 433 MHz sensors can either have a black or grey sensor body.

CAUTION: Although 315 MHz and 433 MHz sensors are identical in size and shape, they are not interchangeable. Always make sure the correct sensor is being used.

NOTE: Sensors may be identified by valve stem cap color. From the factory, 315 MHz sensors have a gray valve stem cap while 433 MHz sensors have a black valve stem cap. Otherwise, once mounted inside a tire and wheel assembly you are not able to visually tell the difference between a 315 MHz and 433 MHz sensor. At that point, the TPM-RKE Analyzer, Special Tool 9936, with the Scan Tool may be used to identify the sensor frequency or the tire can be dismounted allowing visual inspection of the sensor body.

The TPM sensors are designed for original style factory wheels. It is not recommended to install a tire pressure sensor in an aftermarket wheel (This could cause sealing and system performance issues). Do not attempt to install a tire pressure sensor in an aftermarket wheel. If aftermarket wheels are installed and do not contain tire pressure sensors, the system will not function properly and the driver will be continuously notified of a system malfunction.

Fig 1. The serviceable components of the tire pressure sensor are:

Sensor-To-Wheel Seal (2) and Metal Washer (1)
Valve Stem Cap (4)
Valve Stem Core
Valve Stem Nut (with pressed-in washer) (3)
NOTE: Any time a sensor is installed on a wheel, a new Sensor-To-Wheel Seal (2), Metal Washer (1) and Valve Stem Nut (3) must be installed to ensure air tight sealing. A service kit is available.

The valve stem caps and cores are specifically designed for the tire pressure monitoring sensors. Although similar to standard valve stem caps and cores, they are different. The valve stem cap has a special seal inside to keep moisture and corrosion out. The valve stem core has a special nickel coating to protect from corrosion.
Attached Thumbnails
Fig1.JPG   Fig 2.JPG   Fig 3.JPG   Fig 4.JPG  

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post #3 of 27 Old 03-29-2009, 01:26 PM Thread Starter
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OPERATION

The battery operated tire pressure sensor is both a transmitter and a receiver. The TPM sensor can be forced to transmit by using a special tool such as a TPM-RKE Analyzer, or from a transponder. The TPM-RKE Analyzer has the ability to change the sensor’s operating mode to PARK MODE and to help diagnose a faulty TPM sensor. Using a TPM-RKE Analyzer can take up to a minute to force a transmission from a sensor.

The TPM sensor can be in one of the following operating modes:

SLEEP MODE – This is the operating mode of a new TPM sensor. If placed on the vehicle as a road tire, the sensor will transmit once every 20 seconds when the vehicle is driven at speeds over 15 mph (24 km/h). Driving the vehicle continuously at this speed for more then 4 minutes will change the sensor state to DRIVE MODE. Stopping the vehicle for 20 minutes will change the sensor state to PARK MODE. If the vehicle is not moving, the sensor will only transmit on a pressure change greater then 1 psi (6.9 kPa).

PARK MODE – This is the correct operating mode when the vehicle is not moving. The sensor will transmit once every 13 hours to update the WCM, or will transmit on a 1 psi (6.9 kPa) delta change. The sensors will internally take a measurement of the tire pressure every minute to determine a change in tire pressure.
30 BLOCK MODE – If the vehicle has been stopped for more then 20 minutes, or if the sensor’s operating mode was forced to PARK MODE using a TPM-RKE Analyzer, the sensor’s operating mode will transition from PARK MODE to 30 BLOCK MODE once the vehicle is driven over 15 mph. In this mode, the sensor will transmit once every 15 seconds when the vehicle is driven at speeds over 15 mph (24 km/h) for the first 30 transmissions. After about 8 minutes of continuous driving above 15 mph (24 km/h), the sensor’s mode will change to DRIVE MODE.

DRIVE MODE – In this mode, the sensor will transmit once every minute when the vehicle is driven at speeds over 15 mph (24 km/h). At any time the vehicle speed drops below 15 mph, the sensor will not transmit. The sensor mode will still be in drive mode when the sensor reaches speeds over 15 mph (24 km/h), unless the vehicle has been stationary for more then 20 minutes.
Each sensor’s (transmitter) broadcast is uniquely coded so that the wireless control module (WCM) can monitor the state of each of the sensors on the four rotating road wheels. The WCM can automatically learn and store the sensor’s ID while driving “within 10 minutes continuously above 15 mph (24 Km/h)” after a sensor has been replaced. The vehicle must be stationary for more then 20 minutes in order to initiate the learning sequence. The WCM can also learn the sensor's ID using the TPM-RKE Analyzer, Special Tool 9936, with the Scan Tool following the procedure listed in the appropriate diagnostic information

CAUTION: The use of some tire sealants is prohibited for vehicles equipped with the Tire Pressure Monitoring system. Some tire sealants can clog tire pressure sensors.

CAUTION: Any time a sensor is to be installed in a wheel, it is necessary to install a new sensor-to-wheel seal, metal washer and valve stem nut, to ensure air tight sealing.

CAUTION: Tire pressure sensor valve stem caps and cores are specially designed for the sensors. Due to risk of corrosion, do not use a standard valve stem cap or core in a tire pressure sensor in place of the original equipment style sensor cap and core.

CAUTION: When installing the valve core, be sure to tighten the core to specifications

TPM Sensor Nut – 8 N.m / 71 In Lbs
TPM Transponder Mounting Nut – 3 N.m / 26 In Lbs
Valve Core – 0.5 N.m / 4 In Lbs
Wheel Mounting (Lug ) Nut – 135 N.m / 100 Ft Lbs

Wheel Mounting (Lug) Nut Hex Size – 19mm
Wheel Mounting Stud Size – M12 x 1.5

Overtightening by a little as three or four inch pounds can damage the sensor.

CAUTION: Do not attempt to install a tire pressure sensor in an aftermarket wheel. Use tire pressure sensors in original style factory wheels only. If aftermarket wheels are installed, and therefore do not contain tire pressure sensors, the system will not function properly and the driver will be continuously notified of a system malfunction.

NOTE: TPM thresholds have been established for the original tire size equipped on the vehicle. Use original size tires only to maintain system accuracy.

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post #4 of 27 Old 03-29-2009, 01:26 PM Thread Starter
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REMOVAL

1. Raise and support vehicle
2. Remove wheel mounting nuts, then tire and wheel assembly.
CAUTION: The cap used on this valve stem contains an O-ring seal to prevent contamination and moisture from entering the valve stem. Retain this valve stem cap for reuse. Do not substitute a regular valve stem cap in its place.
CAUTION: The valve stem used on this vehicle is made of aluminum and the core is nickel plated brass. The original valve stem core must be reinstalled and not substituted with a valve stem core made of a different material. This is required to prevent corrosion in the valve stem caused by the different metals.

FIG 1.
3. Dismount tire from wheel following tire changer manufacturers instructions while paying special attention to the following to avoid damaging the pressure sensor:
a. When breaking the tire bead loose from the wheel rim, avoid using the Bead Breaker in the area of the sensor. That includes both front and rear beads of the tire.
b. When preparing to dismount the tire from the wheel, carefully insert the mounting/dismounting tool at the valve stem ± 10°, then proceed to dismount the tire from the wheel. Use this process on both the upper and lower tire beads.

FIG 2.
4. Remove sensor nut (3) retaining sensor to wheel. While removing nut, hold pressure against rear of metal valve stem to keep valve stem from pushing rearward, damaging antenna strap.

5. Remove sensor (1) from wheel (2).
Attached Thumbnails
Fig 1.JPG   Fig 2.JPG  

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post #5 of 27 Old 03-29-2009, 01:26 PM Thread Starter
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INSTALLATION

NOTE: Anytime a TPM sensor is reused on a wheel, it is necessary to install a new sensor-to-wheel seal (2), metal washer (1) and valve stem nut (3), to ensure proper sealing around the sensor valve stem (6). See FIG 1 in Post 1.

1. Wipe the area clean around the sensor/valve stem mounting hole in the wheel (5). Make sure the surface of the wheel is not damaged.

Fig 1.
CAUTION: To avoid damaging the sensor antenna strap (1), hold pressure against the rear of the metal valve stem (2) while the sensor is inserted through the wheel mounting hole and the nut is installed.

Fig 2.
2. Insert the sensor (1) through the wheel (2) as shown keeping pressure against the rear of the metal valve stem (See Arrow). The potted side of the sensor is to be positioned toward the wheel. Do not attempt to mount the sensor otherwise, damage may occur.
3. Install the sensor nut (with pressed-in washer) (3) by hand.

Fig 3.
NOTE: Before tightening the sensor nut, push downward on the sensor housing (2) in an attempt to make it flush with the interior contour of the wheel (1).

4. While holding the sensor in position, tighten the sensor nut to 6.5 N•m (58 in. lbs.).
CAUTION: Over-torquing the sensor nut by as little as 12 N•m (106 in. lbs.) may result in sensor separation from the valve stem. Under this condition, the sensor may still function. However, the condition should be corrected immediately.

5. Mount the tire on the wheel following the tire changer manufacturers instructions, paying special attention to the following to avoid damaging tire pressure sensor:

Fig 4.
a. Rotating Wheel Tire Changers - Once the wheel is mounted to the changer, position the sensor valve stem (2) approximately 210° from the head of the changer (located at 1) in a clockwise direction before rotating the wheel (also in a clockwise direction) to mount the tire. Use this procedure on both the upper and lower tire beads.

Fig 5.
b. Rotating Tool Tire Changers - Position the wheel on the changer so that the sensor valve stem (1) is located approximately 210° clockwise from the installation end of the mounting/dismounting tool (2) once the tool is mounted for tire installation. Make sure the sensor is clear of the lower bead breaker area (3) to avoid damaging the sensor when the breaker rises. Rotate the tool (2) in a counterclockwise direction to mount the tire. Use this procedure on both the upper and lower tire beads.

6. Adjust air pressure to that listed on the Tire Inflation Pressure Label (Placard) provided with the vehicle (applied to driver's side B-pillar). Make sure the original style and color valve stem cap is securely installed to keep moisture out of the sensor.

7. Install the tire and wheel assembly (1) on the vehicle. Tighten wheel mounting nuts to 135 N•m (100 ft. lbs.).

8. Lower vehicle.

IF NECESSARY - The following can be performed by your dealer or a service shop with the correct tools.
9. Perform one of the following to make the system learn the new sensor ID.
a. Use the TPM-RKE Analyzer, Special Tool 9936, with the Scan Tool to program the WCM/SKREEM with the tire pressure sensor ID. This is part of the TPM Diagnostic Verification Test.
b. Once the vehicle has remained stationary for more than 20 minutes, drive vehicle for a minimum of 10 minutes while maintaining a continuous speed above 15 mph (24 km/h). During this time, the system will learn the new sensor ID. This is part of the TPM Diagnostic Verification Test.
NOTE: If a sensor cannot be trained, refer to appropriate diagnostic information.
Attached Thumbnails
Fig 1.JPG   Fig 2.JPG   Fig 3.JPG   Fig 4.JPG   Fig 5.JPG  


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post #6 of 27 Old 04-03-2009, 08:38 AM
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So how do you disable the Sensor system when using aftermarket wheels??

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post #7 of 27 Old 04-03-2009, 11:16 AM
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Quote:
Originally Posted by RetiredSERE View Post
So how do you disable the Sensor system when using aftermarket wheels??

Dave
you dont...u reinstall sensors in AM wheels. most newer wheels come ready, some older wheels will requier a kit inorder to use the sensors.
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post #8 of 27 Old 04-04-2009, 10:41 PM
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Okay, so the TPMS stuff is really 'Rocket Science'.

"CAUTION: Do not attempt to install a tire pressure sensor in an aftermarket wheel. Use tire pressure sensors in original style factory wheels only. If aftermarket wheels are installed, and therefore do not contain tire pressure sensors, the system will not function properly and the driver will be continuously notified of a system malfunction."

How would I be continuously notified? I will tolerate a continuous yellow warning light and a single chime on startup but I will not tolerate continuous chimes. Today I put on the compact spare without a sensor and drove the Patriot for 15 miles at 30-50 mph. I received no warning light or chime and when I cycled the EVIC to show tire pressure, it showed 33 lbs for the compact spare without a sensor the same as the road tire that I removed and hid in the garage. I'm planning on getting 4 aftermarket wheels without sensors just for my winter tires unless someone can convince me of dire consequences. I'm open to private messages on this question.
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post #9 of 27 Old 04-05-2009, 05:58 AM Thread Starter
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Quote:
Originally Posted by miketmx View Post
Okay, so the TPMS stuff is really 'Rocket Science'.

"continuously notified of a system malfunction."
It's not really Rocket Science but engineers did write the manual and Jeep has to cover themselves just like all OEMs.

I FULLY believe that this "continuously" means that every restart will alert you with a Single Chime and the "tire light" will stay lit. That's all, nothing more.

I've run with low pressure before and that's all it did. Yup, low pressure is a malfunction.

I did a write up for the seat belt chime over in the Liberty section. It may help to understand the system in general.

Bob

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post #10 of 27 Old 05-18-2009, 08:59 AM
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Is there no way to disable the TPM system so that these "warnings" do not show up ? I too plan to use aftermarket wheels. I really do not want to buy or install new sensors. I check tire pressure one - two times a week anyway.
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post #11 of 27 Old 06-25-2009, 09:40 AM
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Failing TPMS System on new '09 Jeep Wrangler Rubicon

This information was very helpful in understanding how the system works.

I purchased my Jeep about a month ago. Since the day I bought it, after driving it off the lot, the TPMS light came on. I've been back to the dealer five times since; replaced wireless module twice, all five wheel sensors. Still the system is malfunctioning. I was just in yesterday, they couldn't clear the error code, said it was still active and gave me back my Jeep. The dealer is talking to Chrysler...just not sure how big this is on Chrysler's radar yet.

I wanted to post what has been happening to me, so I can better gauge how good/bad the Chrysler TPMS system is. Are other new 09 Jeep owners experiencing similar TPMS failures or do I truly have a lemon on my hands?

Thanks,

Mark
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post #12 of 27 Old 06-30-2009, 08:32 PM Thread Starter
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Here is an "Information Only" TSB http://www.wkjeeps.com/misc/Caliber/...er_2200406.pdf

You can find a link to all of the TSB's and other goodies in the Quick Links sticky.

I'm not aware of a continuous problem like your having. I'm sure you feel like the "lucky one" but over all it seems to be a good system. It would be better if you could disable it though.

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post #13 of 27 Old 10-30-2009, 05:55 PM
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Quote:
Originally Posted by Gramps View Post
It would be better if you could disable it though.
As I recall "big Brother" requires them as a result of the Firestone/Exploder fiasco. They are legislating common sence

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post #14 of 27 Old 10-31-2009, 08:00 AM
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I discovered the problem. Just hadn't posted it here, but I put together a quick paper and provided it to my dealership who said they would provide it to the engineers at Chrysler for future reference. It was the charger for my iPhone. The specific charger is made by Griffin and the model is called the 'PowerJolt'.

The problem would show up about 30 mins. after the charger (with or without phone connected) was plugged in. It would cause the TPMS system to fail (TPMS light indicator). Upon unplugging the charger, the TPMS system failure light would go out within two minutes.

My best guess is the charger is causing radio interference with the rear wheels and/or spare. Once I discovered this issue, I returned it to my dealership who cleared the codes and then rechecked them again a few days later. This explains why error codes would show up for rear wheels and spare, and not the front wheels previously.

I contacted the mfg. of the PowerJolt and they had not heard of any other claims from their users, but promptly sent me a replacement PowerJolt SE to try. The SE worked, and has never caused the interference. They too were interested and shared the information with their engineers.

After several visits to the dealership, countless miles put on my new vehicle and all the frustration, it was a simple phone charger. I'm just glad I figured it out...I would have hated to return the vehicle for another one, which was approaching, only to found out the new vehicle did the same thing once I plugged in the phone charger.

Hope this helps anyone else out who comes across strange behavior with TPMS system. The entire dealership from service department, manager and GM. The senior tech. in the service department was very interested and excited it was finally resolved.

Enjoying my Jeep!

Mark
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post #15 of 27 Old 10-31-2009, 12:27 PM
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Mark.

You owe your dealership a dozen or two of dounuts!

Joe

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