DTC P0724 3.8L
Circuit Description
The torque converter clutch (TCC) brake switch indicates brake pedal status to the transmission control module (TCM). The TCC brake switch indicates that the brake pedal is either applied or released. The normally-closed switch supplies battery voltage to the TCM. Applying the brake pedal opens the TCC brake switch, interrupting voltage to the TCM. When the TCM receives 0 volts at the TCC brake switch input, the TCM turns OFF the torque converter clutch pulse width modulation (TCC PWM) solenoid valve.
If the TCM detects a closed TCC brake switch, indicating pedal released, during a number of decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0724 Brake Switch Circuit High Voltage
Conditions for Running the DTC
| • | No VSS DTC P0722 or P0723. |
| • | DTC P0724 has not passed this ignition cycle. |
Conditions for Setting the DTC
The TCC brake switch indicates continuously CLOSED (12 volts) while the following conditions occur 8 times consecutively:
- The vehicle speed is greater than 32 km/h (20 mph) for 6 seconds.
- The vehicle speed is between 8-32 km/h (5-20 mph) for 3 seconds.
- The vehicle speed is less than 8 km/h (5 mph).
Action Taken When the DTC Sets
| • | The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL). |
| • | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records. |
| • | The TCM stores DTC P0724 in TCM history. |
Conditions for Clearing the DTC
| • | A scan tool can clear the DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the TCM. Does the scan tool display Open? | -- | Go to Intermittent Conditions in Engine Controls - 3.8L | Go to Step 3 |
Caution: Refer to SIR Caution in the Preface section. Does the scan tool display Open? | -- | Go to Step 5 | Go to Step 4 | |
4 | Test the signal circuit of the TCC brake switch for a short to voltage between the TCM and the TCC brake switch. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
5 | Replace the brake pedal position sensor. Refer to Brake Pedal Position Sensor Replacement in Lighting Systems. Did you complete the replacement? | -- | Go to Step 7 | -- |
6 | Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, set-up or programming. Did you complete the replacement? | -- | Go to Step 7 | -- |
7 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 8 | Go to Step 2 |
8 | With a scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
