Automatic Transmission

OPERATION

The Ignition Switch inputs a high signal to the Engine Control Module (ECM) while the engine is cranking. The ECM provides fuel injection control, etc., at engine start-up based on this signal.

When the Ignition Switch is set to "START", the battery voltage at cranking is applied through the Ignition Switch and Park/Neutral Position Switch to the ECM, which detects that the engine is cranking. In case the selector lever is in a position other than the P/N range, the battery voltage is not applied to the ECM.

The Park/Neutral Position Switch converts the selector lever position (whether it is at the P/N range or at others) into high/low voltage and inputs it to the ECM, which then controls the Idle Air Control Motor based on this signal.

The battery voltage in the ECM is applied through a resistor to the Park/Neutral Position Switch. When the selector lever is set to the P/N range, continuity is produced between the Park/Neutral Position Switch terminal of the ECM and ground through the starter motor, thereby making the terminal voltage go low.