P0724

DTC P0724 Brake Switch Circuit High (Stuck Off)





Circuit Description
The brake switch indicates brake pedal status to the Powertrain Control Module (PCM). The brake switch is a normally-closed switch that supplies battery voltage on circuit BRN/RED-GRY/RED to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. 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). The PCM disregards the brake switch input for TCC scheduling if there is a brake switch circuit fault (Refer to Diagnostic Aids).
When the PCM detects a closed brake switch circuit (12 volts, high input) during decelerations, then DTC P0724 sets. DTC P0724 is a type D DTC.

Conditions For Setting The DTC
- No OSS DTCs P0722 or P0723.
- The PCM detects a closed brake switch/circuit (12 volts) without changing and the following events occur seven consecutive times:
- The vehicle speed is greater than 32 km/h (20 mph) for 4 seconds.
- Then the vehicle speed is between 8 - 32 km/h (5 - 20 mph) for 4 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).
- DTC P0724 stores in PCM history.

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 has completes 40 warm-up cycles without a failure reported.
- The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough to power down the PCM.

Diagnostic Aids
- Inspect the wiring for poor electrical connections at the PCM. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for a chafed wire that could short to bare metal or other wiring. Inspect for a broken wire inside the insulation.
- When diagnosing for a possible intermittent short or open condition, move the wiring harness while observing test equipment for a change.
- Check customer driving habits and/or unusual driving conditions (i.e. stop and go, expressway).
- Check brake switch for proper mounting and adjustment.

Test Description
The numbers below refer to the step numbers on the diagnostic chart:
2. This step isolates the brake switch as a source for setting the DTC.

DTC P0724 Brake Switch Circuit High (Stuck Off)





Step 1





Step 2 - 6