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Old 11-20-2008, 12:09 PM   #1 (permalink)
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TPMS Information

I found this site and thought it would be helpful to all with the pesky TPMS. Now with the temps dropping we are seeing those messages again.

Chrysler TPMS - Chrysler TPMS Tools & Tire Pressure Monitoring Systems
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Old 11-20-2008, 12:32 PM   #2 (permalink)
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Mine popped on this morning, and it was substantially colder than its been.
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Old 11-20-2008, 02:57 PM   #3 (permalink)
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I called the local Dodge dealer and they said there is no way to reset the TPMS warning light. It only goes away once the tire pressure reads correctly.

I had my tires rotated at the dealer last week - and they inflated all four to 60 PSI - where the rears need to be set to 40-45. The guy I spoke to said over inflating the rear tires can cause the light to go off.

Why it took 5 days for the warning light to appear, I don't know.
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Old 11-20-2008, 03:04 PM   #4 (permalink)
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If they inflated the tires to 60 then in the morning they would have been about 55 when cold. That is what was triggering my alert. The actual procedure requires setting all to like 70psi and then driving it for about 15 minutes without the Light load on. Then turn on the light load switch and lower the pressure to the 60/45.
My light popped on the other night, so in the morning I had my sone check it for me. He found 55f/47r. Go figure. He aired up to 60/45 and no alarm. I think if you did 65/50 during the day it might just be high enough once cold to keep the TPMS happy.
It is a real pita here in the desert. We have large temp swings and the sun heats up the tires on one side from parking orientation. This makes the pressures uneven and trips the alarm as well. And like the Emission $hit, it is illegal for the dealer to disable the TPMS system.
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Old 11-20-2008, 03:11 PM   #5 (permalink)
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Here's the TSB on TPMS.

NUMBER: 22-002-07 REV. A

GROUP: Tires & Wheels

DATE: Julyl2,2007

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 22-002-07, DATED JUNE 29, 2007, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES AN ADDITIONAL INFORMATION IN REFERENCE TO TIRE ROTATION SERVICE.

SUBJECT:
Tire Pressure Monitor System (TPMS) "Light Load" Reset Switch ** and Tire Rotation Caution**

OVERVIEW:
This bulletin provides information for New Vehicle Prep; setting tire pressures and the Light Load switch.

**This bulletin also provides information regarding tire rotation routine service. **

MODELS:

2008 (DH) Ram Truck 2500

DISCUSSION:
The Tire Pressure Monitor System (TPMS) "LIGHT LOAD" reset switch will allow the driver to switch between the MAX LOAD INFLATION PRESSURE (COLD) low pressure warning threshold and the LIGHT LOAD INFLATION PRESSURE (COLD) low pressure warning threshold depending on the vehicle's load condition. The tire and loading information label defines the recommended front and rear cold tire inflation pressures for the vehicle when operating in the MAX Load condition. A SUPPLEMENTAL TIRE PRESSURE INFORMATION label is also included defining Light Load tire inflation pressures when operating in the Light Load condition. When the "LIGHT LOAD reset switch LED is ON, the TPMS is using the light load inflation pressure (cold) low inflation warning threshold.







SPECIAL TOOLS/EQUIPMENT REQUIRED:

CAUTION :**When performing tire rotation service to this vehicle, tire pressures MUST be adjusted to the specified inflation pressures as stated on the SUPPLEMENTAL TIRE PRESSURE INFORMATION label located on the rear face of the driver door. After service is completed, the TPMS will need to relearn the location of the sensors. This can be accomplished by driving the vehicle over 15 mph (up to 10 minutes) until the system updates and the TPM light in the instrument cluster goes off. This must be completed before returning the vehicle to the customer. **

TPMS NEW VEHICLE PREP PROCEDURE:

1. Turn the ignition switch to the RUN position, (engine off).








2. Adjust all four tires pressures to the LIGHT LOAD INFLATION PRESSURE values as listed on the SUPPLEMENTAL TIRE PRESSURE INFORMATION label. The SUPPLEMENTAL TIRE PRESSURE INFORMATION label is located on the rear face of the driver door (Fig 1).

NOTE :Use an accurate tire gauge to check the tire pressures.

3. Is the LED on the Light Load Switch illuminated?

a. Yes >> Procedure is complete.

b. No >> Proceed to Step # 4


4. After all four tire pressures have been lowered to the "LIGHT LOAD" INFLATION PRESSURES, press the "LIGHT LOAD" switch located on the vehicle center bezel. If the "LIGHT LOAD" switch's amber colored LED turns ON solid, the TPMS is using the LIGHT LOAD TIRE INFLATION PRESSURE (COLD) threshold.

NOTE :If the "LIGHT LOAD" switch amber colored LED flashes on and off for 10 seconds, after all four tire pressures have been set to the LIGHT LOAD INFLATION PRESSURE specifications, one or more of the four tires may NOT be at the correct LIGHT LOAD TIRE INFLATION PRESSURE (COLD) value as indicated on the SUPPLEMENTAL TIRE PRESSURE INFORMATION label. Recheck all four tires and be sure to set all four tires to the specifications indicated on the SUPPLEMENTAL TIRE PRESSURE INFORMATION label.

POLICY:
Information Only

Additional info:
OPERATION

CAUTION: The TPMS has been optimized for the original equipment tires and wheels. TPMS pressures have been established for the tire size equipped on your vehicle. Undesirable system operation or sensor damage may result when using replacement equipment that is not of the same size, type, and/or style. After-market wheels can cause sensor damage. Do not use aftermarket tire sealants or balance beads if your vehicle is equipped with a TPMS, as damage to the sensors may result.

CAUTION: After inspecting or adjusting the tire pressure always reinstall the valve stem cap. This will prevent moisture and dirt from entering the valve stem, which could damage the Tire Pressure Monitoring Sensor.

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: Any time a sensor is to be reinstalled in a wheel, a new seal, nut, cap and valve core must be installed on the stem to ensure air tight sealing.

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

The battery operated tire pressure sensor is both a transmitter and a receiver. The TPM sensor can be forced to transmit if 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 mode and to diagnose a faulty TPM sensor. Using a TPM-RKE Analyzer can take up to a minute to force a transmission from a sensor.

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



Sleep Mode - A new TPM sensor will be in this mode. If placed on the vehicle as a road tire, the TPM sensor will transmit once every 20 seconds when the vehicle is driven at speeds over 15 mph (24 km/h). If the vehicle is not moving, the sensor will only transmit on a pressure change greater then 2 psi (13.8 kPA). Driving the vehicle continuously at speeds over 15 mph (24 km/h) for more then 4 minutes will change the sensor state into 30 BLOCK MODE. The TPM sensor will not return to SLEEP MODE. Now, if the vehicle has been stopped for 20 minutes, the TPM sensor state will change to PARK MODE.
Park Mode - This is the correct mode when the vehicle is not moving. The sensor will transmit once every 13 hours to update the WCM, or will transmit on a 2 psi (13.8 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 not been moving for more then 20 minutes, or if the sensor's 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 8 minutes of continuous driving above 15 mph (24 km/h), the TPM sensor 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 that the vehicle speed drops below 15mph, 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). If the vehicle has been stationary for more then 20 minutes, the TPM sensor will change to PARK MODE.
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 m.p.h. (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 sensor IDs can also be programmed using the TPM-RKE Analyzer Tool. Scan each TPM sensor at each road wheel, and store each Sensor ID in the correct location. (LEFT FRONT, LEFT REAR, RIGHT FRONT, and RIGHT REAR) Connect the TPM-RKE Analyzer Tool to the Scan Tool. Then follow the programming steps outlined in the diagnostic Scan Tool for "Program Tire Pressure Sensor ID w/ TPM Tool" under "MISC" for the "WCM/WIRELESS CONTROL MODULE".
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Last edited by dad2bike; 01-22-2009 at 11:57 AM. Reason: Added more info
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Old 01-01-2009, 07:03 PM   #6 (permalink)
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dad2bike - I need your help with this light load switch. I don't knowif I'm doing something wrong when trying to activate it or not. When I push the button it flashes five times and then goes out. Is the light supposed to stay lit once activated? I followed the steps in your above post, and I can't get the light to stay on like I think it should. Any pointers or is there a trick? Thanks.
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Old 01-01-2009, 08:20 PM   #7 (permalink)
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To clear the system up takes airing it all the way up like the TSB states. Do this to clear the TPMS light (if you have one). Then turn on the light load switch. Look at step #4 above.
I finally just set my tires below the LL point and leave it alone. It sets off the TPMS every once in awhile. Then it goes out. Dunno why.
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Old 01-01-2009, 09:04 PM   #8 (permalink)
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Boy im glad i bought an 07, i would be having all kinds of issues with my 37s
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Old 01-01-2009, 09:18 PM   #9 (permalink)
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Quote:
Originally Posted by dad2bike View Post
To clear the system up takes airing it all the way up like the TSB states. Do this to clear the TPMS light (if you have one). Then turn on the light load switch. Look at step #4 above.
I finally just set my tires below the LL point and leave it alone. It sets off the TPMS every once in awhile. Then it goes out. Dunno why.
When the light load switch is functioning properly, will it stay illuminated or will the light go out? Does the TPMS light have to be on for the switch to function? Just trying to figure this out. I've had my tires set at "max load" pressures for quite some time because I couldn't get this switch figured out. I'm trying to see if I'm doing something incorrectly or if the switch is bad somehow.
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Old 01-01-2009, 09:25 PM   #10 (permalink)
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When the temps started dropping here I ended up going outside and setting my tires EXACTLY to 60psi in front & 45psi in the rear. I did this before even starting the truck. I then turn on the key and while the the grid heater is warming up I push the Light load switch. Once it is set on, leave it alone. No matter what alarms you get later. The 10 seconds (5 flashes) indicates 1 tire off in pressure. It came in very handy having my own air compressor.
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Old 01-02-2009, 10:35 AM   #11 (permalink)
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Dont forget your spare tire!!!! It has a senser too.
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Old 01-02-2009, 10:42 AM   #12 (permalink)
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My tire guy said that you can go to the dealer and get them set to a lower psi? I haven't gone yet, but i think I'll give it a whirl. Starscan should be ble to reset these things.....I hope. My TPMS light sratys on all the time.
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