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Old 09-10-2009, 11:10 AM   #1
 
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Default How do I test my ECU?

I randomly have issues starting, I can crank it but it won't fire. Only telltale sign I've noticed is the CEL staying on. On no start, off no problems. I've tried many different "fixes" including disconnecting the battery, pulling the ECU fuse, etc.. it may work one time but not the next. Lately plugging in a paperclip for ECU codes (no codes ever come up) cranking, pull paperclip, ignition off, crank & fires. I finally found in my Chilton if the CEL stays on, to test the ECU. But how do I besides buying one and waiting for the random occurance (sometimes a month) to happen?
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Old 09-10-2009, 11:16 AM   #2
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Default Re: How do I test my ECU?

What year/engine/mods?

The only reliable way to test the ECU is to swap in a known good one.

When the engine won't start, do you notice that the fuel pump doesn't prime for 2 seconds when the key is turned to ON(II)? Have you checked for lack of spark?

My first guess is a bad main relay, but this should be confirmed by a failure of the fuel pump to prime when the engine won't start.
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Technical links:
FAQs sticky...CEL Codes...Spark diagnosis...
Testing Fuses...Fuse 15 TSB...Cleaning the IACV or FITV

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Old 09-10-2009, 09:22 PM   #3
 
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Default Re: How do I test my ECU?

--What year/engine/mods?

92/ d15b7/ none except air intake

--When the engine won't start, do you notice that the fuel pump doesn't prime for 2
--seconds when the key is turned to ON(II)? Have you checked for lack of spark?

can the fuel pump be heard? either i haven't heard it or haven't listened for it.. don't think there is lack of spark, when the CEL turns off it runs strong, just won't start when CEL stays on

--My first guess is a bad main relay, but this should be confirmed by a failure of the fuel
--pump to prime when the engine won't start.

where is the main relay? i'll listen for the fuel pump. btw i noticed tonight hearing (my best description) something electrical turning on under the dash drivers side when the CEL finally turned off..
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Old 09-10-2009, 09:29 PM   #4
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Default Re: How do I test my ECU?

The fuel pump is located at the top of the gas tank in the rear and makes a low humming noise for 2 seconds when the key is turned to ON(II). If you don't hear it, resolder or replace the main relay.


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Technical links:
FAQs sticky...CEL Codes...Spark diagnosis...
Testing Fuses...Fuse 15 TSB...Cleaning the IACV or FITV

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Old 09-17-2009, 05:55 AM   #5
 
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Default Re: How do I test my ECU?

I hear the fuel pump (now that I know what to listen for) and you're dead on. It doesn't prime when it won't start nor does the relay click. I'm gonna try to replace the main relay this weekend (schedule permitting) and let you know how it goes. I'm certain the relay is the problem, everything points to it.
Thanks for all your help!
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Old 10-09-2010, 01:56 PM   #6
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Default Re: How do I test my ECU?

I have the same problem.

- cel stays on
- fuel pump doesn't prime
- main relay doesn't click
- tried 2 different main relays, still doesn't work

I dont understand whats going on.

What am I missing? Fuses have been checked repeatedly.
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