help! need quick diagnosis
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Junior User
Joined: Jul 2002
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From: Frederick USA
help! need quick diagnosis
95 Eddie Bauer 351
sporadic symptoms, which happen together: emergency brake light indicator stays on; ABS indicator light stays on; speedometer doesn't work; transmission doesn't know when to shift
Happens only occasionally, and this morning, I stopped, turned off the engine, and restarted. Problems went away. This happened about 3 weeks ago and speedo code came up. I replaced the speed sensor and haven't had problems since, until this morning. I need to get this resolved quickly, as I leave on a hunting trip with the truck next week.
Thanks for any ideas.
sporadic symptoms, which happen together: emergency brake light indicator stays on; ABS indicator light stays on; speedometer doesn't work; transmission doesn't know when to shift
Happens only occasionally, and this morning, I stopped, turned off the engine, and restarted. Problems went away. This happened about 3 weeks ago and speedo code came up. I replaced the speed sensor and haven't had problems since, until this morning. I need to get this resolved quickly, as I leave on a hunting trip with the truck next week.
Thanks for any ideas.
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Joined: Oct 2001
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help! need quick diagnosis
It could be one of three things: PSOM, ABS ECU, or rear axle sensor. There are other possiblities such as wiring, but these items are the most common failures. The rear axle sensor is cheap and easy to fix, while the other 2 aren't difficult, just expensive. What is the exact code your are getting? Is it from the ABS system or the Powertrain Control System? I would check the codes in both, and they both may lead to the culprit.
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Junior User
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From: Frederick USA
help! need quick diagnosis
thanks - this just happened on the way in this morning, so haven't had a chance to take it somewhere to pull codes. I just replaced the rear sensor so that shouldn't be the problem, but for $17 bucks, I wish it were. Are there easy ways to check the other things?
Elder User
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help! need quick diagnosis
There are a whole list of things to check, but the codes give a good area to start checking from. You can pull the codes from both systems with a paperclip. If you open the hood, in the driver's side corner by the firewall, you will find 2 diagnostic connectors. The black one is for the PCM, while the red one is for the ABS system. I can get you instructions if you need them.
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help! need quick diagnosis
http://www.corral.net/20anngt/images/test.gif
For the PCM diagnostics:
Using the above picture and the black PCM connector, install the jumper between the top left terminal and the pigtail connector (seperate connector next to the diagnostic connector). Get into your truck and turn the ignition on. The check engine will flash codes one number at a time. A short pause is between digits of the code, while a long pause is between codes. Ex. flash-short-flash-short-flash-long-flash-short-flash translates to code 32. To reset the PCM codes, pull the jumper out while the ignition is on.
For the ABS diagnostics:
Using the above picture and the red ABS connector, install the jumper between the top left terminal and the 3rd terminal from the left on the bottom (just right of the STO terminal). Turn the ignition on and count the ABS light flashes just like above to determine the codes.
Once you get the codes, we may be able to tell you what the problem is.
For the PCM diagnostics:
Using the above picture and the black PCM connector, install the jumper between the top left terminal and the pigtail connector (seperate connector next to the diagnostic connector). Get into your truck and turn the ignition on. The check engine will flash codes one number at a time. A short pause is between digits of the code, while a long pause is between codes. Ex. flash-short-flash-short-flash-long-flash-short-flash translates to code 32. To reset the PCM codes, pull the jumper out while the ignition is on.
For the ABS diagnostics:
Using the above picture and the red ABS connector, install the jumper between the top left terminal and the 3rd terminal from the left on the bottom (just right of the STO terminal). Turn the ignition on and count the ABS light flashes just like above to determine the codes.
Once you get the codes, we may be able to tell you what the problem is.
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Junior User
Joined: Jul 2002
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From: Frederick USA
help! need quick diagnosis
thanks - I'm not all that car-handy, but will try to check it out. Appreciate your help
Kevin
Kevin
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Junior User
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From: Frederick USA
help! need quick diagnosis
Other question is why this happens only sporadically, and will it just get more frequent until it is constant. If I don't have time to do it before the trip, is my trip doomed?
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Elder User
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help! need quick diagnosis
Some faults have to happen a certain number of times before the fault will be triggered. For example, if the computer finds a problem with the rear axle sensor, it will check that sensor several more times, and it could be many miles before it does this. If the computer keeps finding a problem with that sensor, it will trigger the fault and set the computer into default mode. When you restart the vehicle, the computer may find nothing wrong with the sensor the next time. They are sometimes intermittent.
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