Transmission Control System

P1520 - Stop Light Switch Malfunction

CIRCUIT DESCRIPTION

DTC Detection 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.

Wiring Diagram:

Step 1 - 3:

INSPECTION PROCEDURE