STANDARD PROCEDURE - TIRE PRESSURE SENSOR RETRAIN NOTE: Early Build vehicles have a system that is controlled through the Compass Mini Trip Computer (CMTC). Normal Build vehicles have a system that is controlled by the Sentry Remote Entry Module (SKREEM). When Diagnosing the TPM, to determine if the vehicle has an Early or Normal Build system, use the DRBIII® scan tool accessing the SKREEM to determine if it has TPM capabilities. EARLY BUILD VEHICLES WARNING: DEATH OR SERIOUS INJURY CAN OCCUR IF MAGNETICALLY SENSITIVE DEVICES ARE EXPOSED TO RELEARN MAGNET. MAGNETS CAN AFFECT PACEMAKERS. CAUTION: Never attempt to train more than one vehicle at a time. System is capable of reading tire pressure sensor transmissions from other nearby vehicles. Each time a wheel rotation or tire pressure sensor replacement occurs tire pressure sensors must be retrained. This is necessary to inform Compass Mini Trip Computer (CMTC)) that a sensor change was made and where. Retraining is accomplished through instrument cluster and CMTC used in conjunction with a Re-learn Magnet, Special Tool 8821. NOTE: Use following procedure to retrain all four (4) road wheel tire pressure sensors. No attempt should be made to retrain individual sensors. Retrieve Re-learn Magnet, Special Tool 8821. Place key in “ON” position. Press MENU Button on instrument cluster until "RETRAIN TIRE SENSORS?" is displayed. Press STEP button. Display will now read "TRAIN LEFT FRONT SENSOR" NOTE: There is a 60 second timer for training first sensor and a 60 second timer between training remaining sensors. If any of these timers expire, CMTC will abort training procedure. NOTE: If at any time instrument cluster display reads "TRAINING ABORTED", move vehicle ahead at least one foot and repeat entire retraining procedure. Starting at left front tire, place Re-learn Magnet over valve stem (Magnet Placement Over Valve Stem). Within approximately 5 seconds, vehicle horn will chirp indicating training complete at that particular sensor. Remove magnet. NOTE: The order for retraining all four sensors is: Left Front, Right Front, Right Rear, Left Rear. Repeat step (5) on remaining sensors as indicated by instrument cluster until all four TPM sensors are trained. Once instrument cluster displays "TRAINING COMPLETE", pressing either US/M, MENU, STEP or RESET button will exit training routine.
NORMAL BUILD VEHICLES CAUTION: If a sensor is replaced, the vehicle must be parked for a minimum of 15 minutes for the system to be ready to learn the new sensor ID code. Park the car for a minimum of 15 minutes. Drive the vehicle for a minimum of five minutes while maintaining a continuous speed above 13 mph (20 km/h). During this time the system will learn the new sensor ID code and will clear any DTC's automatically. NOTE: If a sensor cannot be trained, refer to appropriate diagnostic information.
There was also a Technical Service Bulletin to address issues with the TPS system.
NUMBER: 22-001-04 GROUP: Tires & Wheels DATE: January 13, 2004 SUBJECT: Erroneous Tire Pressure Monitor (TPM) Warning Lamp Illumination OVERVIEW: This bulletin involves updating the tire pressure values in the Sentry Key Electronic Entry Module (SKREEM). MODELS: 2004 (CS) Pacifica NOTE: This bulletin applies to vehicles equipped with Tire Pressure Monitor System (sales code LAB) built on or after July 10, 2003 (MDH 0710XX) through and including October 20, 2003 (MDH 1020XX). SYMPTOM/CONDITION: Customer may experience TPM warning lamp illumination when all tires are inflated to the correct pressure as stated on the tire pressure placard. The condition may be more frequent in cold ambient temperatures. DIAGNOSIS: If the customer describes the Symptom/Condition and the technician finds the tires are inflated to the correct pressure, 228 kPa (33 psi) cold