4T65-E Automatic Transaxle

DTC P0724









Circuit Description with 4T65-E Automatic Transaxle
The TCC brake switch indicates brake pedal status to the PCM. The TCC brake switch indicates that the brake pedal is either applied or released. The normally-closed switch supplies battery voltage to the PCM. Applying the brake pedal opens the TCC brake switch, interrupting voltage to the PCM. When the PCM receives 0 volts at the TCC brake switch input, the PCM turns OFF the torque converter clutch pulse width modulation (TCC PWM) solenoid valve.
If the PCM 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.

Conditions for Running the DTC
No VSS DTC P0502 or P0503.

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;
Then the vehicle speed decreases to 8 km/h (5 mph) and takes 3 seconds;
^ Finally, the vehicle speed is less than 8 km/h (5 mph).

Action Taken When the DTC Sets
The PCM does not illuminate the malfunction indicator lamp (MIL).
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
^ The PCM stores DTC P0724 in PCM history.

Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and the DTC passes.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. If the Scan Tool indicates that the TCC brake switch is closed in Step 2, and Open when the switch is disconnected, the switch is stuck closed.