retrieving computer codes 90 ram v6
Thread Starter
Joined: Feb 2007
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retrieving computer codes 90 ram v6
My friend's 90 Ram 3.9 is running rich and stalling after warmup.
I suspect a bad O2sensor. Is there a way to verify it by having
the computer throw codes via a blinking check engine light or
do I need a code reader. Thanks in advance.
I suspect a bad O2sensor. Is there a way to verify it by having
the computer throw codes via a blinking check engine light or
do I need a code reader. Thanks in advance.
Professional
Joined: Dec 2006
Posts: 197
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RE: retrieving computer codes 90 ram v6
First off, if the odo has much more than 80,000 miles on it, it probably wouldn't hurt to replace it anyhow.
The Haynes manual lists the procedure, basically you can check it and see if this works:
Turn your Ignition ON, OFF, ON, OFF and ON again (without starting, and to be OFF it doesn't have to be completely OFF just far enough to make the red dash lights go off).
So, one more time: On Off On Off ON.
Then, watch the light and see if it starts flashing.
(That works for my '95, can't hurt to try)
Apparently, the same procedure is used for 1988's, here's that rundown with some codes:
http://autorepair.about.com/library/...once=true&
While comparing these to my Haynes manual (which covers 1994 and up), it appears they're all the same but I only checked the first 5-10 codes, so...
I did check the O2 sensor code, it is 21 for both the 1988 and 94-97 models, so if the '90 model flashes 21, it's likely that.
What happens after the last ON:
It will flash numbers in sequences of two, with a short pause between the two digits, then a longer pause.
In case it has more than one code stored, it will continue to flash these until...
When it is done (or if it has no codes) it will flash code 5-5 (two sequences of 5 strobes).
You need paper and pencil to write these codes down, once you get them you can look it up or post them here, someone should be able to help. If you mess it up or miss a code, start over. Also, I would recommend doing it at least twice, write them down the first time, then double check them.
The Haynes manual lists the procedure, basically you can check it and see if this works:
Turn your Ignition ON, OFF, ON, OFF and ON again (without starting, and to be OFF it doesn't have to be completely OFF just far enough to make the red dash lights go off).
So, one more time: On Off On Off ON.
Then, watch the light and see if it starts flashing.
(That works for my '95, can't hurt to try)
Apparently, the same procedure is used for 1988's, here's that rundown with some codes:
http://autorepair.about.com/library/...once=true&
While comparing these to my Haynes manual (which covers 1994 and up), it appears they're all the same but I only checked the first 5-10 codes, so...
I did check the O2 sensor code, it is 21 for both the 1988 and 94-97 models, so if the '90 model flashes 21, it's likely that.
What happens after the last ON:
It will flash numbers in sequences of two, with a short pause between the two digits, then a longer pause.
In case it has more than one code stored, it will continue to flash these until...
When it is done (or if it has no codes) it will flash code 5-5 (two sequences of 5 strobes).
You need paper and pencil to write these codes down, once you get them you can look it up or post them here, someone should be able to help. If you mess it up or miss a code, start over. Also, I would recommend doing it at least twice, write them down the first time, then double check them.
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Joined: May 2004
Posts: 55
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From:
RE: retrieving computer codes 90 ram v6
the codes that can flash at you are listed in a haynes manual, prob the chilton too. the proceduretopsites listed should get you the codes for any LA series engine with a smec-Single model engine controller (for TBI and MPFI systems) . 12 means disconnected battery within the last 50ign key-ons (can be ignorned if you disconnected the battery),55 is the end of output code. some codes will not flash the check egn light and wihave to be read with a readout box. if you get flash codes, i can tell you what they mean, i dont feel like typing any more of the haynes manual. hope it helped.
