P0724

Circuit Description

The brake switch reports brake pedal status to the powertrain control module (PCM). The brake switch indicates that the brake pedal is either applied or released. This normally-closed switch supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the brake switch, interrupting voltage to the PCM. When the PCM receives 0 volts at the brake switch input, the PCM turns OFF the TCC solenoid valve.

When the PCM detects battery voltage on circuit 420, indicating a closed brake switch (pedal released) during a number of decelerations, then DTC P0724 sets. DTC P0724 is a type D DTC.

Conditions for Running the DTC

^ No VSS DTCs P0502 or P0503.
^ The vehicle speed is greater than 32 km/h (20 mph) for more than 6 seconds.
^ The vehicle speed decreases to 8 km/h (5 mph) and takes more than 4 seconds.
^ The vehicle speed is less than 8 km/h (5 mph). The above conditions must occur 7 times.

Conditions for Setting the DTC

^ DTC P0724 sets if the brake switch is closed (voltage to PCM) without opening for 2 seconds.
^ Conditions for Running the DTC are met.

Action Taken When the DTC Sets

The PCM does not illuminate the malfunction indicator lamp (MIL).

Conditions for Clearing the DTC

^ A scan tool clears the DTC from PCM history.
^ The PCM clears the DTC from the PCM history if the vehicle completes 40 consecutive warm-up cycles without a non-emission related diagnostic fault occurring.

Diagnostic Aids

^ Ensure that the brake switch is properly adjusted.
^ Inspect the wiring at the PCM, the brake switch connector and all other circuit connecting points for the following conditions:
- A backed out terminal
- A damaged terminal
- Reduced terminal tension
- A chafed wire
- A broken wire inside the insulation
- Moisture intrusion
- Corrosion
^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

Test Description

The number below refers to the step numbers on the diagnostic table.

2. A scan tool display that changes from Closed to Open when the brake switch is disconnected indicates the brake switch harness and PCM are functioning properly.