Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0774: Low Tire Pressure System PerformanceDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Low Tire Pressure System Performance | -- | -- | -- | C0774 |
Circuit Description
The tire pressure monitor (TPM) system has 4 radio frequency (RF) transmitting pressure sensors inside each wheel/tire assembly. If a sensor detects a low tire pressure, the DIC will display the CHECK TIRE PRESSURE, and the Electronic Brake Control Module (EBCM) will receive a serial data message that a DTC C0774 has set. The Vehicle Stability Enhancement System (VSES) will compensate for the low tire pressure with a calibration change to low tire present. Review the TPM for diagnostics for C0774.
Conditions for Running the DTC
Vehicle speed is 32 km/h (20 mph), or greater for 1 minutes.
Conditions for Setting the DTC
| • | The TPM detects a tire pressure difference in 1 tire of 8.2 kPa (1.2 psi) higher or lower than the other 3. |
| • | The EBCM will receive a serial data message that a DTC C0774 has set. |
Actions Taken When the DTC Sets
| • | A DTC C0774 is stored in memory. |
| • | The VSES system compensates for low tire pressure. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the TPM system is reset. |
| • | A history DTC will clear after 100 consecutive malfunction free ignition cycles from when the TPM system has been reset. |
Diagnostic Aids
| • | A possible cause of this DTC could be a low tire pressure in one of the four tires. |
| • | Review the tire pressure monitoring (TPM) system check for more information. Refer to Diagnostic System Check - Tire Pressure Monitoring . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
