1500 4x2 Pickup V8-5.2L CNG VIN T (1996)
Automatic Shut Down (ASD) Relay: Description and Operation
Compressed Natural Gas
CIRCUIT OPERATION
When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 3 in the Power Distribution Center (PDC) to circuit
A21. Circuit A21 feeds circuit F18 through fuse 9 in the fuse block. Circuit F18 powers the coil side of the Automatic Shut Down (ASD) relay The
Powertrain Control Module (PCM) supplies ground for the coil side of the relay on circuit K51. Circuit K51 connects to cavity C3 of the PCM.
When the PCM grounds the ASD relay contacts inside the relay close and connect circuit A16 from fuse 4 in the PDC to circuit A142. Circuit
A142 splices to the generator field terminal, fuel injectors, ignition coil, low pressure fuel shut-off solenoid, and the heated oxygen sensors. Circuit
A142 also connects to cavity C12 of the PCM.
