1990 Gmc Sierra Had Power Fuel Pump Relay Fuse Online Diag Id Bad ECM

1990 GMC SIERRA
200,000 MILES
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ANONYMOUS
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  • 1 POST
had no power to fuel pump relay or fuse online diag id it as a bad ecm disconnected power and replaced ecm new from parts store reconnected power and the check engine light is now flashing very fast ant idea why ?
Oct 19, 2012 at 12:56 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
did you put the old prom in the new ecm? that may be why. or it's grounded.
Oct 19, 2012 at 1:16 PM
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