P0724

DTC P0724 BRAKE SWITCH "B" CIRCUIT HIGH

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The purpose of this circuit is to prevent the engine from stalling while driving in lock-up condition, when brakes are suddenly applied.

When the brake pedal is depressed, this switch sends a signals to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The circuit prevents the engine from stopping when the vehicle is stopped by sudden braking when the torque converter clutch is in the "lock-up" mode. The ECM receives the signal from the stop light switch at the time brake pedal is depressed. Then, the ECM sends the signal to the lock-up solenoid valve not to be in lock-up condition. When the stop light switch remains ON during "stop and go" driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on. The vehicle must stop and go (3 km/h (2 mph) to 30 km/h (19 mph)) ten times for two driving cycles in order to detect malfunction.

Wiring Diagram:

Step 1 - 2:

INSPECTION PROCEDURE