Drive Signal

DRIVE Signal:

The purpose of the DRIVE signal is to inform the ECM whether the car has automatic transmission or a manual gearbox and also to cause the ECM to increase engine rpm as soon as the selector lever is moved to position R, D, 1, 2 or 3 on cars with automatic transmission.

When the ignition switch is in the Drive position, battery positive voltage will be applied to pin 3 of the transmission range switch (selector lever switch). Moving the selector lever to position R, D, 1, 2 or 3 causes the contact in the switch to close and battery positive voltage will be applied to pin 14 of the ECM.

On cars with TOS, battery positive voltage is applied to pin 16 of the ASA control module when the contact in the transmission range switch closes. A signal then goes from the ASR control unit to the ETS control module, which ensures that engine rpm is increased.