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

NOTE: The following information is intended to be used in conjunction with the electrical diagrams.

CIRCUIT OPERATION
Circuit A14 from the [1][2][3]Power Distribution Center (PDC) supplies battery voltage to the contact side of the Automatic Shut Down (ASD) relay. Circuit A21 from fuse 14 in the fuse block supplies battery voltage to the coil side of the ASD relay. The Powertrain Control Module (PCM) provides the ground path for the coil side of the relay on circuit K51. Circuit K51 connects to cavity 51 of the PCM connector.

Circuit A142 splices to supply voltage to the fuel injector, distributor ignition coil, and heated oxygen sensor. The A142 circuit also feeds circuit A141 which in turn feeds circuit A61. Circuit A61 supplies voltage to the fuel pump module.