C0750

DTC C0750, C0755, C0760, or C0765
Circuit Description
The Tire Pressure Monitor (TPM) sensor transmits a radio frequency message to the Remote Control Door Lock Receiver (RCDLR) when the TPM sensors detect a vehicle speed of 32 km/in (20 mph), the TPM sensors will enter a powered up stage and begin to transmit a unique identification code and tire pressure information from 0 - 427 kPa (0 - 62 psi) to the RCDLR. The RCDLR waits for the first sensor to transmit its information. When the first sensor transmits its information 8 times, the RCDLR checks whether all sensors have transmitted there information. If one or more of the TPM sensors do not transmit their information, the RCDLR will set the appropriate DTC(s) for the TPM sensor(s) that did not transmit. When the vehicle is stationary for more than 20 minutes, the sensors enter power down or sleep mode and will transmit tire pressure information once every 60 minutes.

Conditions for Setting the DTC
^ The vehicle completes a diagnostic cycle (driving for about 35 minutes at speeds over 32 km/in (20 mph) and the TPM sensor has not transmitted tire pressure information.
^ If any given sensor stops transmitting.

Action Taken When the DTC Sets
^ Stores a DTC in the receiver memory
^ Sends a message to the IPC/DIC to display the SERVICE TPM SYSTEM message
^ The IPC/DIC will default to display the tire pressure as dashes.

Condition for Clearing the DTC
^ The TPM sensor transmits tire pressure information to the receiver before a diagnostic cycle is completed.
^ Use a scan tool.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids
^ The IPC/DIC will default to display the tire pressure as dashes if the receiver is unable to receive or send tire pressure data.
^ If there is an open in the serial data line to the receiver, the IPC/DIC will display dashes for all tire pressure values and the SERVICE TPM SYSTEM message.
^ Clear the receiver diagnostic memory before road testing the vehicle whenever a TPM sensor is replaced in order to avoid reading the original DTC stored in the memory.
^ Take tire pressure measurements when the tires are cold in order to obtain the lowest readings.
^ Occasionally TPM sensor transmission will not be received by the RCDLR due to radio frequency vehicle level interference.

Test Description
The number(s) below refers to the step number on the diagnostic table.
4. Tests whether the condition is module, system, or condition related.
7. Tests whether the condition has been corrected or identified as specified in supporting text.