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What are the symptoms of a bad ECU?

Tiny
WILEECOYOTE345
  • MEMBER
  • 1993 HONDA CIVIC
  • 173,000 MILES
I have been having some hot start problems and I tried to see if there were any check engine light (cel) codes on the ecu, so I took the jumper plug (aka the service connector) on the ecu and inserted a paperclip into both holes of the connector. Then I turned the ignition key to position II to see if the cel would flash codes. But when I turned the key to position II the cel stayed on steady. What does this mean?
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Sunday, March 25th, 2012 AT 8:23 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Is the CEL coming On while engine is idling?
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Sunday, March 25th, 2012 AT 8:28 PM
Tiny
WILEECOYOTE345
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  • 6 POSTS
No, there have been no CEL's.
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Sunday, March 25th, 2012 AT 8:30 PM
Tiny
RASMATAZ
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There's nothing in there to worry about-if something is wrong it'll pop the light
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Sunday, March 25th, 2012 AT 8:33 PM
Tiny
WILEECOYOTE345
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So does this mean that my hot start problems are not caused by a bad sensor?
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Sunday, March 25th, 2012 AT 8:54 PM
Tiny
RASMATAZ
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Hot start could be a fuel pressure problem-check it if its within specs
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Sunday, March 25th, 2012 AT 8:58 PM

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