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1989 Honda Prelude ECU code light flashing 14

Tiny
HENRYHEPBURN
  • MEMBER
  • 1989 HONDA PRELUDE
  • 4 CYL
  • FWD
  • MANUAL
  • 180,000 MILES
I was told that the output from O2 sensors should be between 0.1 and 0.9 volts so I just checked them and the voltages are both below nornal range, like 0.042 for one of them. So I decided to take a look at the ECU light with engine off and key on. It's flashing 14. Can you tell me what that means, I tried resetting the ECU by pulling its fuse and the radiuo too. Still the same results. It's a 2.0si FI DOHC Thanks
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Monday, April 13th, 2009 AT 11:15 PM

12 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hello
Thanks for the donation

Below is some information about the trouble code you have along with troubleshooting procedures..


https://www.2carpros.com/forum/automotive_pictures/261618_Noname_454.jpg



https://www.2carpros.com/forum/automotive_pictures/261618_Noname2_123.jpg



Let me know if you need further assistance.

Thanks for using 2CarPros.com!
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Tuesday, April 14th, 2009 AT 2:27 AM
Tiny
HENRYHEPBURN
  • MEMBER
  • 14 POSTS
Thanks very much, I'll give it try!
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Tuesday, April 14th, 2009 AT 8:42 AM
Tiny
HENRYHEPBURN
  • MEMBER
  • 14 POSTS
Maybe I should have mentioned that the Check Engine light never comes on. Perhaps it has a bad bulb? I've only observed the flashing light on ECU. Thanks
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Tuesday, April 14th, 2009 AT 8:44 AM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Does the check engine light come on for a few seconds when you first insert key into ignition? This is called the bulb check. If it does not come on then the bulb is most likely blown.
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Tuesday, April 14th, 2009 AT 12:02 PM
Tiny
HENRYHEPBURN
  • MEMBER
  • 14 POSTS
Well the check engine light probably is blown out. I'll have to figure out how to get at it next. I did however check the EACV, the resistance was only about 1.5 ohms, not shorted to ground, so I changed it with another unit with a resistance of 13 ohms, now the ECU light flashes code 9 after resetting the ECU. The battery voltage was present at the EACU connector. I noticed yesterday after trying to accelerate rather quickly in a traffic situation that the car seemed to lose power as if it wasn't getting fuel and then it started to surge very intensely and would only hold power when I would try to accelerate. As soon as I tried to just maintain a steady speed it would seem to just drop off or deaccelerate, but it never wanted to stall. After letting the car sit for several hours it seemed OK but I never did try to accelerate quickly again, not wanting to agitate the situation. After that I changed the EACV. Perhaps the ECU has a problem, maybe it's not even the right ECU for this car? I've had this car for about 18 months without having any real trouble with it. Thanks!
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Wednesday, April 15th, 2009 AT 7:26 AM
Tiny
BLUELIGHTNIN6
  • MECHANIC
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So replacing the EACV did not cure the problem? Then I suggest substituting a known good ECU.
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Wednesday, April 15th, 2009 AT 10:48 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If Code 9 is showing after resetting, you have a faulty distributor which is causing driveability problems.
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Monday, April 20th, 2009 AT 3:48 PM
Tiny
HENRYHEPBURN
  • MEMBER
  • 14 POSTS
Thanks for that info. I haven't found an exact ECU to swap it with but I did find one from an 89 automatic but the number on the ECU is a bit different. My ECU has A, C-MT 502-221903, and the one I found has 503. I hven't tried it yet but I will soon. I did notice the small wiires in the distributor from the two pickups look a bit shabby like the insulation is disintergrating. Thanks again!
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Monday, April 20th, 2009 AT 5:30 PM
Tiny
HENRYHEPBURN
  • MEMBER
  • 14 POSTS
I found a broken wire on the plug connecting the "cylinder position sensor" driven by front cam shaft on my 2.0si. The rear cam drives the distributor. I disconnected the battery and reset ECU, no more codes on ECU light. Thanks for all the help! Hope this is helpful to anyone else.
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Thursday, April 23rd, 2009 AT 11:06 AM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Great glad you got it fixed and thanks a bunch for letting us know the solution! It will help us help others with similar issues.

Thanks for using 2CarPros. Com!
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Thursday, April 23rd, 2009 AT 11:31 AM
Tiny
HENRYHEPBURN
  • MEMBER
  • 14 POSTS
Just took the dash apart to check the check engine light bulb, it wasn't there! Voila!
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Thursday, April 23rd, 2009 AT 9:54 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Thank you for the input. It is very much appreciated and glad that the problem has been resolved.
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Friday, April 24th, 2009 AT 10:36 AM

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