Tire Pressure Monitor (TPM) Info

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sperry:
From the May 2005 GM Techlink:

Tire Pressure Monitor  

A Tire Pressure Monitor (TPM) system was added to certain GMC and Chevrolet full-size utility trucks for model year 2004 and continues for 2005. The same style system will be rolled out on additional vehicles in 2006. To help you understand this system, a Know-How video was prepared:

Course 10290.04D
Understanding TPM Systems for GM Trucks
March 2005 Emerging Issues

Here are some highlights. For details, refer to the video. A proper understanding of the system, its components, and its operation will help you properly diagnose operating conditions. You will learn to determine when parts replacement and reprogramming are or are not required to remedy the condition.

TPM System Components

The main TPM system components are:
- DIC
- Passenger Door Module (PDM)
- Instrument Panel Cluster
- 4 pressure sensors
- Serial data circuit

Tire Pressure Sensor Operation

The tire pressure sensors are incorporated into the valve stem of each road wheel. The pressure sensor transmits a radio frequency message which is received by a module in the vehicle.

When the vehicle is stationary, the sensor’s internal roll switch is open, which puts the sensor into stationary mode. The sensor samples tire pressure once every 30 seconds and transmits once every 60 minutes.

When the vehicle is moving, centrifugal force closes the sensor’s internal roll switch, which puts the sensor into drive mode. The sensor samples tire pressure every 20 seconds and transmits every 60 seconds.

Passenger Door Module (PDM) Operation

The PDM is the receiver in the full-size utility truck. The receiver module varies by vehicle platform. The PDM receives each sensor’s RF (radio frequency) transmission and translates the data into:
- sensor presence
- sensor mode
- tire pressure.

TIP: If the vehicle is equipped with RPO UK3, the PDM sends tire pressure and tire location data over the serial data circuit to the DIC, where they can be selected and displayed.

In addition to the display of tire pressures, the DIC in full-size utility trucks can also display two system messages -- “Check Tire Pressure” and “Check Tire Monitor”. Here are the important differences.

“Check Tire Pressure” message -- If a sensor detects a 1.6 psi (11 kPa) change in pressure, it transmits in re-measure mode. If the system detects a significant loss of tire pressure in any tire, the Check Tire Pressure message is displayed on the DIC and the low tire pressure indicator is illuminated on the IPC.

TIP: A “Check Tire Pressure” message will not set system codes. This is normal operation of the system. The purpose of this message is to alert the driver to check and adjust tire pressure.

TIP: Both the message and indicator can be cleared by adjusting the tire pressure to the recommended pressure.

“Service Tire Monitor” message -- If the PDM detects a malfunction in the TPM system, it will cause the DIC to display the Service Tire Monitor message.

TIP: The “Service Tire Monitor” message is not a normal system operation. DTCs should be set when this message is displayed.

Tire Pressure Sensor Relearn

DIAGNOSTIC TIPS:

- Try to determine from the customer which message has been displayed. This is especially important when you cannot find TPM system related DTCs stored.
- Always check and adjust the tire pressures COLD. As a rule of thumb, tire pressure will change one psi for every 10° F (6.9 kPa for every 5.6° C).
- Always use a known accurate tire pressure gauge.
- Always ‘relearn’ the system before replacing a suspect sensor.

Tech 2 Readouts

The Tech 2 can be used for Tire Pressure monitoring information and functions:
- Display tire sensor IDs
- Display tire sensor mode
- Display tire pressure
- Initiate the TPM Learn procedure
- Set up or change tire pressure placard value for the vehicle
- Set up a Passenger Door Module for TPM operation. A service PDM does not come ready for use with TPM. This function must be enabled when a replacement PDM is installed.

When to Perform a Tire Pressure Relearn

The tire pressure sensor relearn procedure must be performed after every PDM replacement, every sensor replacement, and every tire rotation. Once the TPM learn mode has been enabled, each of the sensors’ unique ID codes can be learned into the PDM’s memory. There are two ways to excite the sensors and enter the learn mode.

Pressure Change Method -- This is performed by increasing or decreasing the air pressure in each tire by a specified amount, which forces the sensors to transmit in re-measure mode.

TIP: This method can be reviewed in SI and can also be viewed on the GM Common Training Website.



J-46079 TPM Diagnostic Tool Method -- Turn the ignition ON with the engine OFF, and set the parking brake. Place the PDM in TPM learn mode by cycling the parking lamps ON and OFF 4 times within 4 seconds. The horn will chirp and the low tire pressure indicator will begin to flash. This indicates the learn mode has been enabled.

Proceed in this order: left front, right front, right rear, left rear. Starting with the left front tire, hold the antenna of the J-46079 against the tire sidewall close to the wheel rim at the valve stem, and momentarily press the activate button.

After the horn chirps, repeat the procedure for the other three wheels. After all of the sensors have been learned, exit the learn mode by turning the ignition OFF.

TIP: Before starting this procedure, ensure that no TPM equipped vehicle nearby is having its sensors relearned simultaneously, or its tire pressures adjusted. It is possible for the PDM to learn a stray learn or re-measure mode transmission from another vehicle’s sensors.

TIP: When a sensor is changed or relearned, the vehicle must be driven above 20 mph (32 km/h) for the DIC to update.

Sensor Color

In early 2005, sensor part numbers and colors were changed. The 2004 and some early 2005 trucks have a blue color sensor, and most 2005 trucks have a beige color sensor. If you find an early 2005 truck with blue sensors, it is not necessary to replace them with beige ones.

Tool Tip

Here’s a tip regarding your J-46079 TPM Diagnostic Tool (fig. 12).

When the internal battery is fresh (fully charged), the indicator is “full,” or all dark. When the battery is depleted, the indicator shows “empty,” or all light.

When the battery is low enough to show empty, the tool may perform some functions, but not others. For instance, it may perform the Simulate function, but not the Learn function. If you cannot get a vehicle to learn, don’t assume the sensors are bad. The tool may just need a fresh battery.

- Thanks to David Roland and Ken Beish

sperry:
From the June 2005 GM Techlink.

Tire Mounting and Dismounting and the TPM

This information applies to the 2000--05 Cadillac Deville, Seville, STS, 2004--05 Cadillac CTS, Escalade, SRX, XLR, 1999--2005 Chevrolet Corvette, 2004--05 Chevrolet Tahoe, Suburban, 2004--05 GMC Yukon, Yukon XL.
`Left out the Avalanche again :E: :2:

When dismounting and mounting tires, be careful when breaking the bead loose from the wheel rim.





If the tire machine's bead breaking fixture is positioned too close to the TPM sensor, or pressed down directly on top of it, it may contact the sensor as the tire bead breaks away from the wheel rim. This can damage the TPM sensor and require the sensor to be replaced.

Also be careful when transferring the tire bead to the other side of the wheel rim. As the tire machine rotates and the tire bead is stretched around the wheel rim, the bead can come in contact with the sensor. This can also cause sensor damage, requiring replacement. Damage can be avoided by correctly positioning the wheel and tire in relation to the mounting/dismounting head.

Tire Dismounting Tips

Refer to SI -- Tire Mounting and Dismounting section for more information.
- Place the sensor's cap and valve on a dry, clean surface after removal. The cap is aluminum and the valve is nickel-plated to prevent corrosion. Do not substitute a cap made of any other material.
- When separating the tire bead from the wheel, position the bead breaking fixture 90° from the valve stem.
- Position the mounting/dismounting head so the tire iron or pry bar can be inserted slightly clockwise of the sensor body when prying the tire bead up and over the mounting/dismounting head.
- Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the outside of the wheel rim.

Tire Mounting

- Position the mounting/dismounting head 180° from the valve stem.
- Position the bead transition area 45° counterclockwise of the valve stem.
- Using the tire machine, rotate the tire/wheel assembly clockwise when transferring the tire bead to the inside of the wheel rim.

- Thanks to John Spidle

sperry:
 Document ID# 1547501 2004 Chevrolet Avalanche - 4WD

04-05 Chevrolet/GMC/Cadillac All Full Size Utilities Check Tire Pressure Message - kw wheel low monitor sensor MIL message TPM UJ6 program display PDM door passenger #PIT3143 - (Aug 27, 2004)

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:

Some inquires concerning a "Check Tire Pressure" message have been received after the wheels/tires have been swapped from another vehicle. The tire pressure sensors will learn to the vehicle and there will be no "Service Tire Monitor" message. It may be noticed when reviewing the TPM (Tire Pressure Monitor) Data, with the Tech 2, that the tire pressures are incorrect. Example, all tire pressures may be set at 35 psi but the TPM data will display all the tire pressures at 18 psi. This could be caused by the wrong tire pressure sensors installed.

Recommendation/Instructions:

There was a change to the tire pressure sensors in 2005. Make sure the correct part number sensors are installed.

2004- 15136883 TPM sensor

2005- 15114379 TPM sensor

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. (GM Only: If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.)

Models:

(04-05 Chevrolet Tahoe, Suburban, Avalanche) and (04-05 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL) and (04-05 Cadillac Escalade, Escalade ESV, Escalade EXT)

sperry:
The TPM Block / Schematic diagram:

The image expands; how, depends on your browser.

sperry:
Document ID# 1509677 2004 Chevrolet Avalanche - 4WD
    
Passenger Door Functions Inoperative and/or Service Tire Pressure Monitor Message -kw PDM window door lock mirror module electrical body lock communication no RKE #PI02082 - (May 13, 2004)

Passenger Door Functions Inoperative and/or Service Tire Pressure Monitor Message

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:

Owners may have a concern with all passenger door module functions and RKE inoperative. If the vehicle is equipped with the Tire Pressure Monitor System the Service Tire Pressure Monitor System Message will be displayed on the DIC. It may be noticed that the Tech 2 is unable to communicate with the Passenger Door Module (PDM). This could be caused by the PDM being logic locked.

Recommendation/Instructions:

To correct this concern, perform a refresh with the Tech 2. Currently, the Tech 2 software is not available for the 2004 model year. In the meantime, build the Tech 2 as a 2003 model year and perform a Refresh as per Bull 03-08-52-001C. After the PDM refresh is complete, all door functions will be restored and the Tech 2 will be able to communicate with the PDM. With communication restored, reprogram the PDM with the current calibration available in TIS2000.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

Models:

(2004 Chevrolet All Full Size Trucks and Utilities) and (2004 GMC All Full Size Trucks and Utilities) and (2004 Cadillac All Full Size Utilities) and (2004 Hummer H2)

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