DTC C0750, C0755, C0760, or C0765 w/o UH3
Circuit Description
The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensor's internal roll switch, which puts the sensor into drive mode. The remote control door lock receiver (RCDLR) receives and translates the data contained in the tire pressure sensor's RF transmissions into sensor presence, sensor mode and tire pressure. Once vehicle speed is 20 mph, or greater, the RCDLR waits for the first sensor to go into drive mode, then checks if all sensors have gone into drive mode. If one or more sensors do not go into drive mode, or do not transmit at all, the RCDLR will set DTC C0750, C0755, C0760, or C0765.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC C0750 Left Front Low Tire Pressure Sensor |
| • | DTC C0755 Right Front Low Tire Pressure Sensor |
| • | DTC C0760 Left Rear Low Tire Pressure Sensor |
| • | DTC C0765 Right Rear Low Tire Pressure Sensor |
Conditions for Running the DTC
Vehicle speed is at least 32 km/h (20 mph).
Conditions for Setting the DTC
Any given sensor stops transmitting for 10 minutes.
Action Taken When the DTC Sets
| • | A DTC is stored in memory. |
| • | The driver information center (DIC) displays the SERVICE TIRE MONITOR warning message. |
| • | The DIC displays the suspect tire pressure as dashes. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the malfunction is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles. |
Diagnostic Aids
| • | Sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors to ensure the DTC set is for that actual physical corner of the vehicle. Refer to Tire Pressure Sensor Learn . |
| • | Some aftermarket wheel valve stem holes are located further form the wheel rim than the original equipment wheels. When using the J-46079 Tire Pressure Monitor Diagnostic Tool to activate a sensor, ensure the tool's antenna is no further than 6 inches from the sensor. |
| • | The tire pressure sensors transmit on the FM band and are received by the RCDLR through the antenna grid in the vehicles rear window. Visually inspect the antenna grid for any physical damage or poor connections at either end of the antenna coax. |
| • | Certain types of rear defroster grid malfunctions can create RF interference that may cause a TPM system malfunction. To determine if this condition is present, operate the vehicle within the condition for running and setting the DTC and verify the TPM malfunction only occurs when the rear defroster is turned On. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests if the sensors can transmit valid data with good signal strength in response to a low frequency activation. During this step it is important to observe the signal strength graph on the TPM tool's display screen. Any more that 1/4 graph displayed can be considered good signal strength.
-
This step tests if any sensors are mislocated.
-
This step tests if the RCDLR can receive, learn and translate data contained in simulated sensor transmissions.
-
This step tests if the sensor's internal roll switch is functioning properly.
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 in Vehicle DTC Information |
Using the J-46079 Tire Pressure Monitor Diagnostic Tool, activate each tire pressure sensor and record each sensor's transmission data and physical location on the repair order. Does the J-46079 display all 4 sensor locations, IDs, and tire pressures? | Go to Step 3 | Go to Step 7 | |
Do the Ids and their locations observed on the scan tool match the IDs and locations recorded on the repair order? | Go to Step 4 | Go to Step 5 | |
Does the scan tool display all 4 sensor locations, IDs, and tire pressures? | Go to Step 5 | Go to Step 8 | |
5 | Learn the tire pressure sensors. Refer to Tire Pressure Sensor Learn . Did you complete the learn procedure? | Go to Step 6 | -- |
Does the scan tool indicate that the suspect Pressure Sensor Mode changes from Wake to Drive? | System OK | Go to Step 7 | |
7 | Replace the suspect tire pressure sensor. Refer to Tire Pressure Indicator Sensor Replacement . Did you complete the replacement? | Go to Step 9 | -- |
8 | Replace the remote control door lock receiver (RCDLR). Refer to Remote Control Door Lock and Theft Deterrent Receiver Replacement in Keyless Entry. Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
DTC C0750, C0755, C0760, or C0765 UH3
Circuit Description
The Tire Pressure Monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensor's internal roll switch, which puts the sensor into drive mode. The tire pressure receivers receive and convert the sensor's RF transmissions into signal voltages, which are then sent to the tire pressure module where the signal voltages are converted back into RF transmissions. The remote control door lock receiver (RCDLR) receives and translates the data contained in the tire pressure module's RF transmission into sensor presence, sensor mode and tire pressure. Once vehicle speed is 20 mph, or greater, the RCDLR waits for the first sensor to go into drive mode, then checks if all sensors have gone into drive mode. If one or more sensors do not go into drive mode, or do not transmit at all, the RCDLR will set DTC C0750, C0755, C0760, or C0765.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC C0750 Left Front Low Tire Pressure Sensor |
| • | DTC C0755 Right Front Low Tire Pressure Sensor |
| • | DTC C0760 Left Rear Low Tire Pressure Sensor |
| • | DTC C0765 Right Rear Low Tire Pressure Sensor |
Conditions for Running the DTC
Vehicle speed is at least 32 km/h (20 mph).
Conditions for Setting the DTC
Any given sensor does not go into drive mode or does not transmit at all for 20 minutes.
Action Taken When the DTC Sets
| • | The driver information center (DIC) displays the SERVICE TIRE MONITOR warning message. |
| • | The DIC displays the suspect tire pressure as dashes. |
| • | A DTC is stored in memory. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the malfunction is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles. |
Diagnostic Aids
| • | Sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors to ensure the DTC set is for that actual physical corner of the vehicle. Refer to Tire Pressure Sensor Learn . |
| • | Occasionally, sensor transmissions are not received by the driver side antenna module due to vehicle level radio frequency interference. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests if the sensors internal battery level is low.
-
This step tests if the sensor is malfunctioning. If the absence of horn chirp during the learn procedure in this step follows the relocated sensor, the malfunction is in the sensor.
-
This step tests if the sensor's internal roll switch is functioning properly.
-
This step tests if the tire pressure receiver is functioning properly. If the absence of a horn chirp during the learn procedure in this step follows the relocated tire pressure receiver, the malfunction is in the tire pressure receiver.
-
This step tests if the malfunction is in the RCDLR.
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 in Vehicle DTC Information |
Does the scan tool display the suspect Pressure Sensor Mode as Low Bat? | Go to Step 10 | Go to Step 3 | |
3 | Learn the tire pressure sensors. Refer to Tire Pressure Sensor Learn . Did a horn chirp sound when learning the suspect sensor? | Go to Step 5 | Go to Step 4 |
Did a horn chirp sound when learning the suspect sensor? | Go to Step 10 | Go to Step 6 | |
Does the suspect Pressure Sensor Mode data parameter change from Wake to Drive above 32 km/h (20 mph)? | System OK | Go to Step 10 | |
Did a horn chirp sound when learning the suspect sensor? | Go to Step 11 | Go to Step 7 | |
7 | Test the suspect tire pressure receiver's power, ground and signal circuits for a short to voltage, short to ground, or an open. Did you find and correct the condition? | Go to Step 14 | Go to Step 8 |
8 | Inspect for poor connections at the suspect tire pressure receiver harness connector. Did you find and correct the condition? | Go to Step 14 | Go to Step 9 |
9 | Inspect for poor connections at the tire pressure module harness connector. Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
10 | Replace the suspect tire pressure sensor. Refer to Tire Pressure Indicator Sensor Replacement . Did you complete the replacement? | Go to Step 14 | -- |
11 | Replace the suspect tire pressure receiver. Refer to Tire Pressure Monitoring System Component Views . Did you complete the replacement? | Go to Step 14 | -- |
Did a horn chirp sound when learning the suspect sensor? | Go to Step 14 | Go to Step 13 | |
13 | Replace the RCDLR. Refer to Remote Control Door Lock and Theft Deterrent Receiver Replacement in Keyless Entry. Did you complete the replacement? | Go to Step 14 | -- |
14 |
Does the DTC reset? | Go to Step 2 | System OK |
