The ecu is generally mounted on the passenger side of the engine block,look for wires that have been chewed or worn from vibration. Dis
nect the chassis batteries,remove the 3 connectors on the ecu look at the pins on the ecu and look closely at the pins on the ecu harness. Again google what data conector you have in the front run bay or look under the dash should be a grey diagnostic connector with 7 or 9 pins and check for power snd ground on thst connector after you have hooked up the chassis batteries. Check all fuses in the battery compartment they are the ones mounted on the side wall with black plastic caps over them check for any inline fuses in the engine compartment they are usually tie wrapped to other components.
Gordie Kaltz
04 dip 330 ISC