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 startup 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.