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− − Problems That are Not System Faults How a Diagnostic Trouble Code (DTC) is Set How to Troubleshoot DTCs 18-49 • Tire Sealant Fluid sealant used to repair a punctured tire can • Cold Weather When the weather is extremely cold - about 40 °F ( 40 °C) or colder - the output of the lithium battery in each tire pressure sensor may drop far enough that • Non-TPMS Wheels Vehicles equipped with TPMS must use wheels made • When the system detects a problem, the TPMS control unit sets a code, but shifts to fail-safe mode, • If the TPMS control unit loses power, or fails, the TPMS indicator will come on, but no DTC will be set. • The memory can hold all the DTCs that could possibly be set. However, when the same DTC is • DTCs are indicated in ascending order, not in the order they occurred. • Set DTCs are stored in the EEPROM (nonvolatile memory), they cannot be cleared by disconnecting DTC troubleshooting procedures assume the cause of 1. Ask the customer to describe the conditions when the indicator came on, and try to reproduce the 2. If an indicator does not come on during the test- drive, check for loose terminals, poor contact due 3. After troubleshooting, clear the DTCs, and test- drive the vehicle. Make sure no indicators come on. (cont’d) |