INDIRECT TIRE PRESSURE MONITORING SYSTEM (ITPMS) 26. A. INTRODUCTION ITPMS is ABS value added function, which detect low tire pressure by comparing relative wheel speed via wheel speed sensors of ESC system. No separate pressure sensor, ECU require. Non serviceable / Maintenance free System • Only needs software level changes in ESC & integration with partner ECUs. • ESC ECU will provide low tire pressure warning through Instrument Cluster. • B. INDIRECT TIRE PRESSURE MONITORING SYSTEM The Indirect tire pressure monitoring system (iTPMS) senses low tire pressure by comparing relative wheel speeds via wheel speed sensor of ABS system. As added safety your vehicle is equipped with indirect Tire pressure monitoring system, if one or more tires pressure decrease below the recommended value, the system warning light will be illuminated in instrument panel cluster with text message “check all tire Pressure and Reset the TPMS system”. For the system to function properly it is driver’s responsibility to fill the recommended Tire pressure in all four wheels before resetting the iTPMS system successfully. This will be a reference point for system to indicate tire pressure warning correctly. Hence it is important to follow recommended iTPMS reset procedure. C. WORKING When tire pressure drops significantly below Recommended levels the “check all tire Pressure and reset the iTPMS system” Indicator comes ON ( ) with text message. Steering control which needs to be used for Selection of iTPMS Reset BRAKES 69
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