Direct Tire Pressure Warning System - Diagnostics
PRODUCT GENERAL INFORMATIONPG002-04
Title:
DIRECT TIRE PRESSURE
WARNING SYSTEM
Models:
'04 GX 470
June 18, 2004
NOTE:
Read this TSB in its entirety BEFORE performing any diagnosis to the Tire Pressure Warning System.
Introduction
A direct Tire Pressure Warning System is now standard equipment on 2004 model year GX 470 vehicles. A tire pressure sensor (or tire pressure monitor) is attached to each wheel directly sensing the air pressure of each tire. The Tire Pressure Warning System detects the pressure of each tire, including the spare tire, and illuminates a tire pressure warning light (!) to inform the driver of low tire pressure. Each pressure sensor has a unique ID. When tires are swapped, wheels changed, or any work is preformed on a tire, these IDs must be recorded. In the event that the IDs are not recorded when service is performed, it will be necessary to register the pressure sensor IDs.
Individual tire pressure sensors need to be registered when:
^ Tire pressure monitor IDs of the data list are incorrect.
^ Replacing the tire pressure monitor valve sub-assembly.
^ Replacing the tire pressure monitor ECU.
^ Performing a tire swap from vehicle to vehicle.
Applicable Vehicles
^ 2004 model year GX 470 vehicles produced AFTER the Production Change Effective VIN shown.
Production Change Information
Warranty Information
Required SSTs
Tire Pressure Adjustment Procedure
Locating the Tire Pressure Sensor ID
It may be necessary to physically locate the tire pressure sensor ID numbers if:
^ You are replacing one or more tire pressure sensors.
^ No tire pressure sensor IDs are present in the Data List.
^ Tires have been swapped for any reason and original IDs were not recorded.
Follow the screen flow below to locate and identify the current tire pressure sensor IDs.
Scroll through the Data List to the REGIT ID1, ID2, ID3, ID4 and ID5. These are the IDs that are currently registered to the vehicle. Write down the transmitter ID numbers from the Data List, or use the transmitter ID numbers that were obtained from each tire pressure sensor. If replacing one sensor, the current transmitter ID numbers must be written down BEFORE the registration procedure can be performed. If REGIT ID1, ID2, ID3, ID4 and ID5 display all zeros or # " signs, there are no current codes registered in the Tire Pressure Monitoring System. Follow the steps below if there are no codes present on the Data List.
If the ID numbers were present, proceed to Tire Pressure Registration procedure on.
Follow the procedure below to locate the tire pressure sensor IDs on each sensor:
1. Deflate tire and break the top bead.
NOTE:
Extreme caution must be used to ensure that the tire removal arm does not break the tire pressure sensor while attempting to break the bead on the rim.
2. Depress the tire enough to inspect the tire pressure sensor.
NOTE:
It is not necessary to remove the tire from the rim to inspect for this ID.
3. On the front of the sensor there is a 7 digit ID as shown in the figure. Write this number down for future reference (it will be input using the Diagnostic Tester).
4. Reseat the tire back to the wheel and set the tire pressure of all wheels to the specified value.
5. Remount the tire and wheel assembly to the vehicle.
6. Torque all wheels to the vehicle according to vehicle recommendations.
7. Go to the Tire Pressure Registration Procedure
Tire Pressure Registration Procedure
1. Connect the Diagnostic Tester to DLC3.
2. Turn the ignition switch to the ON position.
Follow the screen flow shown.
3. View Data List and ensure all tires are reading tire pressure and temperature correctly. Drive the vehicle and ensure that the tire pressure warning light (!) does not illuminate.