For 1990-2009 cars

### Circuit Description

TPMS Receiver Module receives the vehicle speed signal from the transmission control module (TCM) and also receives the information of the tire inflation pressure from the transmitters and the transmitter’s condition. With these information, the TPMS decides that the warning lamp indication is needed or not.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0775,C0776,C0777,C0778 Air Pressure Warning

### Conditions for Running the DTC

Vehicle speed is above 32 km/h (20 mph).

### Conditions for Setting the DTC

The tire inflation pressure is lower than 179 Kpa (26 psi)

### Action Taken When the DTC Sets

TPMS warning lamp turns ON.

### Conditions for Clearing the DTC

Inflate the tire to the proper specification.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Tire Pressure Monitoring System Schematics
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Inflate the tire to the proper specification. Is the repair complete? | Go to Step 3 | --
3 |

1. Clear the DTCs with the scan tool.
2. Operate the vehicle within the condition for running and setting the DTC.

Does the DTC reset?

Go to Step 2

System OK