Transmission Control System

P1520 - Stop Light Switch Signal Malfunction

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

Wiring Diagram:

Steps 1 - 2:

Step 3:

INSPECTION PROCEDURE