MU4 Automatic Transaxle

DTC P0724

Test 1:

Test 2-6:

Circuit Description with MU4 Automatic Transaxle
The brake switch indicates brake pedal status to the powertrain control module (PCM). When the brake pedal is operated, the switch sends a signal to the PCM, the PCM then cancels the operation of the TCC lock-up while braking is in progress. This prevents the engine from stalling.

Conditions for Running the DTC
^ The switch does not turn off even once the vehicle is driven (2-trip detection logic).
^ The ignition is ON.

Conditions for Setting the DTC
The PCM detects a closed brake switch circuit, 12 volts, without changing for 2 seconds and the following events occur eight times:

The vehicle must stop and go from 3 km/h (2 mph) to 30 km/h (19 mph) ten times for two driving cycles before detecting a malfunction.

Action Taken When the DTC Sets
^ The PCM illuminates the malfunction indicator lamp (MIL).
^ The PCM stores DTC P0724 in PCM history.

Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
Inspect the brake switch for proper mounting and operation.

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