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 GRY/RED-BRN/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 Assy. 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 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 in order to power down the PCM.

Diagnostic Aids
^ Inspect the wiring for poor electrical connection 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 traffic conditions (i.e. stop and go, expressway).
^ Check brake switch for proper mounting and adjustment.

Test Description
The numbers 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)