Main Relay (Computer/Fuel System): Description and Operation

Main Relay:

PURPOSE
The Electronic Control Module (ECM) relay allows operating power to the ECM.

OPERATION
The ECM Relay Coil receives 12 VDC from a fuse link and is grounded through pin 4 of the ECM. When the relay coil is grounded, the contact switch closes and supplies battery voltage to pin 47 of the ECM.