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Home >> Lexus >> 2008 >> IS F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - SFI System Diagnostics (3 Of 4) >> DTC P0724 Brake Switch "B" Circuit High >> Description

DTC P0724 Brake Switch "B" Circuit High: Description

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 signal to the ECM Then the ECM cancels the operation of the lock-up clutch while braking is in progress

DTC DETECTION CONDITION CHART

DTC No DTC Detection Condition Trouble Area
P0724 The stop light switch remains ON even when the vehicle repeats 5 cycles of STOP (less than 1 86 mph [3 km/h]) and GO (18 65 mph [30 km/h] or more) (2 trip detection logic)
  • Short in stop light switch signal circuit
  • Stop light switch
  • ECM