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Q:

replacedthe ecm but will not start on 2004 Isuzu Ascender

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
with a remote starter switch eng will turn over but will not start with key on .if you try with key all lites in dash go out .new battery
(1) Answer
try disconnecting the battery for a few minutes. it may reset. be sure to coat both posts with petroleum jelly before reconnecting.