P0724

DTC P0724





Circuit Description
The brake switch indicates brake pedal status to the PCM. The normally-closed brake switch supplies ignition voltage to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. Releasing the brake pedal resumes voltage to the PCM. When the PCM senses 0 volts at the brake switch input, the PCM de-energizes the Torque Converter Clutch (TCC) solenoid valve.
When the PCM detects a closed brake switch, stuck OFF, during decelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.

Conditions for Running the DTC
- The ignition switch is in the ON position.
- The system voltage is 8 - 18 volts.

Conditions for Setting the DTC
DTC P0724 sets if the PCM detects a closed brake switch or circuit, 12 volts, during vehicle deceleration and the following conditions occur eight times:
- The vehicle speed is greater than 32 km/h (20 mph) for 6 seconds;
- then, the vehicle speed is 8 - 32 km/h (5 - 20 mph) for 3 seconds;
- then, 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. Disconnecting the brake switch connector, and observing a status change, isolates the brake switch as the source of the DTC.
3. This step inspects the signal circuit for a short to voltage, if the brake switch status on the scan tool did not change in Step 2.
4. If the brake switch is properly adjusted, then the brake switch must be replaced.
5. Replace the PCM only after you have completed the preceding diagnostic steps.