2009 Dodge Ram 1500 Pickup Owner Manual - Page 241

UNDERSTANDING YOUR INSTRUMENT PANEL 239 CAUTION! The TPMS has been optimized for the original equipment tires and wheels. TPMS pressures and warning have been established for the tire size equipped on your vehicle. Undesirable system operation or sensor damage may result when using replacement equipment that is not of the same size, type, and/or style. Aftermarket wheels can cause sensor damage. Do not use tire sealant from a can, or balance beads if your vehicle is equipped with a TPMS, as damage to the sensors may result. 26. Malfunction Indicator Light (MIL) The Malfunction Indicator Light (MIL) is part of an onboard diagnostic (OBDII) system which monitors the emissions and engine control system. If the vehicle is ready for emissions testing, the light will come on when the ignition is first turned on and remain on, as a bulb check, until the engine is started. If the vehicle is not ready for emissions testing the light will come on when the ignition is first turned on and remain on for 15 seconds, then blink for 5 seconds, and remain on until the vehicle is started. If the bulb does not come on during starting, have the condition investigated promptly. 4 NOTE: The TPMS telltale is also accompanied by a If this light comes on and remains on while driving, it "Low Tire" message in the odometer (Base Cluster), or in suggests a potential engine control problem and the need the Electronic Vehicle Information Center (EVIC) screen for system service. indicating "Low Tire" for EVIC enabled clusters.