Stop Light Switch STP

The stop light switch input to the ECU is used to modify the deceleration fuel cut program when the vehicle is braking. Whenever the STIR signal is high (brake pedal is depressed), fuel cutoff and resumption rpm is reduced to improve driveability characteristics of the vehicle.

In the event the STP signal is lost, fuel cut will take place at the standard deceleration speed, causing an objectionable feel when fuel is canceled.

The STP signal at the ECU will be low as long as the brake pedal is not applied. When the pedal is depressed, current flows through the normally open stop light switch to the stop lamps and the ECU, causing the STP voltage to go high.

Toyota Engine Control Servc
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