Tire Monitor System - Operational Characteristics
No.: TSB-06-31-001DATE: March 3, 2006
MODEL: See below
SUBJECT:
TIRE PRESSURE MONITORING SYSTEM
AFFECTED VEHICLES
2004-on Endeavor
2004-06 Montero
2006-on Galant models equipped with aluminum wheels
PURPOSE
Customers should be advised of the operational characteristics of the tire pressure monitoring system (TPMS) and how the system is affected by changes in elevation and ambient temperature.
If a tire loses inflation pressure, inspection of the TPMS sensor grommet for deformity/damage should be included in diagnosis. Grommet replacement parts are available.
TPMS OPERATION
^ The TPMS warning light will come on when the tire inflation pressure in any road tire is below specification.
^ The warning light will go off and the TPMS DTC in memory will be eliminated when tire pressure is increased to specification or above.
^ Always check tire inflation pressures when the tires are cold (vehicle has been parked for at least three hours or driven less than one mile after having been parked for three hours).
^ The TPMS valve may not seal properly on non-OEM (aftermarket) wheels.
AFFECTS OF ELEVATION AND AMBIENT TEMPERATURE
Customers may experience what appears to be an "intermittent" tire pressure warning light because the air pressure in the tires normally fluctuates under various operating conditions:
- When operating the vehicle in different elevations, such as driving to the mountains: Under this condition, the tire pressure will decrease 0.5 psi for every 1,000 ft. increase in elevation.
- In cold weather, tire pressure will become lower due to the ambient temperature, and the TPMS warning light will come on if tire pressure drops below a specific pressure. The tire pressure will increase after driving (tires warm up), and the TPMS warning light will go off.
Regardless of the ambient temperature, set the tire pressures to specification when the tires are cold (vehicle has been parked for at least three hours or driven less than one mile after having been parked for that time.)
NOTE:
Tire pressure changes at slightly less than I psi per 10 degrees Fahrenheit of ambient temperature change.
EXAMPLE
For example climates with seasonal temperatures that vary from 90 degrees F in the summer to 10 degrees F in the winter have an 80 degree temperature change. This can result in an approximate 8 psi change in tire pressure. In this example:
^ If the tire pressure was set to 32 psi when the ambient temperature was 90 degrees F in the summer the pressure can lower to about 24 psi on the coldest day in the winter. This will cause the TPMS warning light to turn on.
^ If the tire pressure was set when the ambient temperature was 10 degrees F in the winter it can be at about 40 psi on the hottest day of the summer. This will create a rougher ride.
Customers who operate vehicles in climates that have more than a 70 degree variance in temperature should have their tire pressure seasonally adjusted. In addition, they also may need to adjust the tire pressures when driving the vehicle at different elevations.
Retailers should make customers aware of this condition, but advise them to always visually inspect their tires when the TPMS warning light comes on.
SERVICE INFORMATION
Refer to Group 31, "Tire Pressure Monitoring System (TPMS)" in the appropriate service manual for details on grommet replacement and TPMS operation.
1. Check if non-OEM (aftermarket) wheels are installed. Inform the customer that the TPMS valve may not seal properly if aftermarket wheels are installed and would not be a warrantable condition.
2. Adjust tire inflation pressures to the inflation specification on the placard before attempting any further diagnosis or repairs to the TPMS.
3. If tire is damaged, repair or replace tire as necessary.
If tire still loses inflation pressure, inspection of the TPMS sensor grommet for deformity should be included in diagnosis. Inspect the TPMS sensor grommet (0-ring). Replace the 0-ring if it is deformed.
Be sure to tighten the valve nut to 5.5 Nm (49 in/lb).
NOTE:
0-ring damage or deformity on aftermarket wheels is not a warrantable condition.
4. For diagnosis instructions when the TPMS warning light comes on, and for activating (registering) the TPMS sensors, refer to Group 31, "Tire Pressure Monitoring System (TPMS) Diagnosis" in the appropriate service manual.
PARTS INFORMATION
Use the Genuine Mitsubishi Part listed below. This part number may be ordered from your facing PDC, but is currently not listed in CAPS.
Description Part Number
TPMS Sensor 0-Ring (grommet) MN103035
WARRANTY INFORMATION
Unless there is an actual diagnosed defect in the Tire Pressure Monitoring System or deformity in one of the 0-rings, the following conditions (not all inclusive) are NOT warrantable and a warranty claim may NOT be submitted:
^ Resetting tire pressure for a customer
^ Tightening valve nuts
^ Replacing individual TPMS sensors due to external damage
^ Replacing a TPMS sensor (transmitter) or 0-ring for any reason if the TPMS has been transferred to any aftermarket wheel
^ Replacing a TPMS sensor (transmitter) due to a deformed 0-ring only
Claims submitted for the above issues or any other issue unrelated to an actual defective component will be charged back. All replaced TPMS sensors claimed under warranty will be requested for return for testing, and will be charged back if testing shows not defective.
When a customer comes in with an illuminated TPMS warning light, dealership service advisors should be instructed to always check tire pressure on all four tires before any other diagnosis is performed.
Warrantable Repair Labor Operations (warrantable repairs only)
TPMS-related labor operations are located in Section 31 of the MMC LOTS on page 31-2.
Current Operation Code:
31850110 TPMS Control Module Replacement
31870210 TPMS Transmitter Replacement
31870310 TPMS Antenna Replacement
31870384 TPMS Antenna Assembly Replacement (Montero front only)
31870386 TPMS Antenna Assembly Replacement (Montero rear only)
New Operation Code:
31850114 TPMS Re-Registration 0.3 hrs.
Warranty Claim Completion Requirements:
If a defective and warrantable TPMS component is repaired and/or replaced, the observed Diagnostic Trouble Codes must be entered in the SPEC VALUE field on ALL RELATED CLAIMS. Claims submitted for any warrantable TPMS issue that do not have the observed DTCs entered on the related claim will be charged back.