P0724

Diagnostic Chart:

Wiring Diagram:

Circuit Description

The brake switch reports brake pedal status to the Powertrain Control Module (PCM). This normally-closed switch supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. If the PCM receives a zero voltage signal at the brake switch input, and the Torque Converter Clutch (TCC) is engaged, the PCM de-energizes the Torque Converter Clutch Solenoid Valve (TCC Sol. Valve).

When the PCM detects a continuously closed brake switch (pedal released) during a period, including a number of decelerations, then DTC P0724 sets. DTC P0724 is a type D DTC.


Conditions for Setting the DTC

^ No Vehicle Speed Sensor (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 more than 7 times with the brake switch signal indicating continuously Closed, without being Open for more than 2 seconds.


Action Taken When the DTC Sets

The PCM does not illuminate the Malfunction Indicator Lamp (MIL).


Conditions for Clearing the DTC

A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.


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 bent terminal.

- A backed out terminal.

- A damaged terminal.

- Poor 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 a faulty brake switch.