P0724

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 ORN 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 and closed brake switch circuit (12 volts, high input) during decelerations, then DTC P0724 sets. DTC P0724 is a type D DTC.





Wiring Diagram

Part 1 Of 3:

Part 2 Of 3:

Part 3 Of 3:

Inspection Procedure


Conditions For Setting The DTC
- No OSS DTCs P0722 or P0723.
- The PCM detects an open brake switch/circuit (12 volts) without changing and the following events occur seven consecutive times:
- Vehicle speed is greater then 32 km/h (20 mph) for 4 seconds.
- Vehicle speed is between 8 and 32 km/h (5 and 20 mph) for 4 seconds.
- Vehicle speed is less than 8 km/h (5 mph).

Action Taken When The DTC Sets
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
- DTC P0724 stores in PCM history.

Conditions For Clearing The DTC
- The DTC can be cleared from the PCM history by using a scan tool.
- The DTC will also be cleared from history when the vehicle has achieved 40 warm-up cycles without a failure reported.
- The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled "off" long enough 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, highway).
- 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.