Question: code,53,52,54

[money pit]

back again with another problem.have not received FSM yet sorry for the ?
no one else to ask.
code 53 fuel pump voltage,code52 overvoltage,code54 adu error,know idea what ADU ERROR MEANS
85 CORVETTE P.S intermittant engine light

 

[boomdriver]

I'd get that alt tested before doing anything else. Its either a bad voltage regulator thats allowing the max charge to go thru the system (17v very bad for computers ) or the ECM is is toast. The prom or calpak might be loose or defective.