engine light on
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,466
Likes: 41
From: Auburn MA
engine light on
My Check Engine Light comes on when I drive it for bout 20 mins to a half hour. When i shut it off it turns off. I tried reading it at the local Auto Zone but i dont think their reader could read it because it kept giving a link error. When the light is on it smells like it is running ritch and it doesnt smell ritch when it is off. Does that mean it can be anO2 sensor
Team Owner
Joined: Sep 2001
Posts: 62,119
Likes: 1,725
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Need to know the code before we start guessing about O2 sensors. No point in throwing money at the problem if you dont know what the problem is.
Burning Brakes
Joined: Apr 2003
Posts: 783
Likes: 2
From: Wake Forest, NC
St. Jude Donor '05
You've got a 94, so it's an OBDII connector, but basically an OBDI system behind it with a few OBDII codes thrown in...
No wonder they couldn't read it at Autozone.
Your check engine light won't stay on when you shut the car off... thats normal.
Use a paper clip to jumper pins A and B, then turn your key to the on position (dopn't crank it)... the check engine light will begin to flash.. You can count the flashes to find out what code (codes) are stored in there. It should start with a code 12... then flash your trouble codes afterwards, and should give a 12 when it's finished again...
See if you can figure out the codes and post them up... then we can give you more help.
No wonder they couldn't read it at Autozone.
Your check engine light won't stay on when you shut the car off... thats normal.
Use a paper clip to jumper pins A and B, then turn your key to the on position (dopn't crank it)... the check engine light will begin to flash.. You can count the flashes to find out what code (codes) are stored in there. It should start with a code 12... then flash your trouble codes afterwards, and should give a 12 when it's finished again...
See if you can figure out the codes and post them up... then we can give you more help.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,466
Likes: 41
From: Auburn MA
i will scan it tonight one of my buddies has a scanner for a 94 vette and i am going to check it out tonight. I tried the paperclip thing the other night and I ended up blowing the interior light fuses doing it once i stuck the clip in there so that kind of scared me away from attempting it again. but if it comes up with an O2 sensor will it say wich one of the 4 are faulty. and where would be the best place to get them
Drifting
Joined: May 2004
Posts: 1,543
Likes: 1
From: Levittown NY
If you deside to give the paperclip thing a try again here is the proper way to do it
Sequenced Code Recovery - 1994 through 1996:
In 1994, Chevrolet went to a 16 pin ALDL connector in preparation for the federally mandated change to the much more capable OBD-II (On Board Diagnostics - Version 2) system.
As with the 1990-1993 model, you can display codes on the speedometer but the pins to be shorted are different:
Beginning in 1994, you short pin "12" to pin "4" and once again turn the ignition switch to "On" without starting the engine.
The speedometer will display any codes using the same protocol as the 1990-1993 model but there are some changes in the designation for the modules plus additional modules are added:
Module "1" is still the CCM module.
Module "4" is now called the PCM module (Powertrain Control Module) because automatic transmission computer control was added to Engine Control Module in 1994.
Module 7 (on the 1996 model only) is the RTD module. (This is the Real Time Dampening module which replaced the Selective Ride Control module in 1996).
Module 9 is the ABS/ASR module number from 1994 through 1996.
Finally, Module "A", the DERM (Dynamic Energy Control Module --- the air bag control module) will be requested to show any codes.
Just like the 1990-1993 display, you read the codes on the speedometer and read the module number on the trip odometer.
Again, you can cause the codes to repeat by turning the ignition off for five seconds and then back on.
Turn the ignition off and remove the short to restore normal operation.
Originally Posted by taken from corvettebuyers.com
Sequenced Code Recovery - 1994 through 1996:
In 1994, Chevrolet went to a 16 pin ALDL connector in preparation for the federally mandated change to the much more capable OBD-II (On Board Diagnostics - Version 2) system.
As with the 1990-1993 model, you can display codes on the speedometer but the pins to be shorted are different:
Beginning in 1994, you short pin "12" to pin "4" and once again turn the ignition switch to "On" without starting the engine.
The speedometer will display any codes using the same protocol as the 1990-1993 model but there are some changes in the designation for the modules plus additional modules are added:
Module "1" is still the CCM module.
Module "4" is now called the PCM module (Powertrain Control Module) because automatic transmission computer control was added to Engine Control Module in 1994.
Module 7 (on the 1996 model only) is the RTD module. (This is the Real Time Dampening module which replaced the Selective Ride Control module in 1996).
Module 9 is the ABS/ASR module number from 1994 through 1996.
Finally, Module "A", the DERM (Dynamic Energy Control Module --- the air bag control module) will be requested to show any codes.
Just like the 1990-1993 display, you read the codes on the speedometer and read the module number on the trip odometer.
Again, you can cause the codes to repeat by turning the ignition off for five seconds and then back on.
Turn the ignition off and remove the short to restore normal operation.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,466
Likes: 41
From: Auburn MA
I read the code and it is an O2 sensor on the right bank. By the readings i am getting from the reader it seems like it isnt even plugged in. Where are these O2 sensors and is there a way to test them to see if they are any good. How hard are they to get at and replace
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,466
Likes: 41
From: Auburn MA
let me correct what i stated earlier. I had a stored code Left (bank 2) O2 sensor then the current code is a (Bank 1) Right O2 sensor Heater circuit. The readings were around 450 when they should have been around 20-38.
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