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1990 Acura Legend check engine light

Tiny
SANTIBANEZ
  • MEMBER
  • 1990 ACURA LEGEND
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 240,000 MILES
How do I turn off my check engine light. Car will not start when light is on. The has been off for the past 2 weeks and car has started and now light is on it will not start. It must be a sensor. How do I locate and reset or change sensor. I bought a obd 1 and it is useless. Please help iam low on money.
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Sunday, July 4th, 2010 AT 11:00 AM

4 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi santibanez,

The most common fault with the CEL not turning off during initial ignition ON is the PGM-FI main relay. Remove the relay and check for cracked solders. Resoldering the relay works.


https://www.2carpros.com/forum/automotive_pictures/192750_PGMFIRelay90Legend_3.jpg



If it is not the fault of the relay, then it could be a faulty sensor or the ECM itself. We start with the relay.
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Sunday, July 4th, 2010 AT 1:43 PM
Tiny
SANTIBANEZ
  • MEMBER
  • 4 POSTS
Thank u I will start on those repairs as soon as I get off wrk. This site is very helpful I had no idea it existed.
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Sunday, July 4th, 2010 AT 8:30 PM
Tiny
SANTIBANEZ
  • MEMBER
  • 4 POSTS
Sorry to bug u but one quick questions. The diagram u sent with your response, what is that picture of and where is it located.
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Sunday, July 4th, 2010 AT 8:36 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Note the PGM-FI main relay location in the diagram.
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Monday, July 5th, 2010 AT 2:10 PM

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