OBD Code reader for 1990
Thread Starter
Racer
Joined: Mar 1999
Posts: 323
Likes: 0
From: Webster, NY
OBD Code reader for 1990
Hello,
From what I understand, the OBD II code readers,which are most popular, will only work on '96 and newer G.M. cars. What will work for my '90? one that will read the code and will it "reset" the code also? Does the reader show the code in numerics or does it rely on the long/short flashing lite type? Need to reset the INF/Rest. lite on my car. Thanks for any input.............
From what I understand, the OBD II code readers,which are most popular, will only work on '96 and newer G.M. cars. What will work for my '90? one that will read the code and will it "reset" the code also? Does the reader show the code in numerics or does it rely on the long/short flashing lite type? Need to reset the INF/Rest. lite on my car. Thanks for any input.............
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
you can use the old paper clip in the ALDL. you need to disconnect the battery for a few minutes to clear old codes. In the ALDL above your right knee, when in the drivers seat pull the cover off the ALDL, if it's still there-bend a paper clip into a U shape, insert it into the TWO pins on the RIGHT, turn the key on-DON'T START, you will then get a flash-pause flash flash-indicating a code 12-good, it flashes code 12 three times-then if there is an error code it will flash.
Last edited by rick lambert; Apr 9, 2006 at 11:56 PM.
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
From 1990 through 1993, you shorted ALDL pin "G" to "A" and turned the ignition to "On" without starting the engine.
This action will cause the speedometer and trip odometer to become a troubleshooting aid:
The codes will display on the speedometer. If there are no codes, the speedometer will show three dashes (---) and if the CCM cannot communicate with the other computers, the letters "ERR" will show up on the display.
The module number associated with the codes will be displayed on the odometer and will show which computer's codes is being displayed.
For the 1990 and 1991 Corvette, the modules are Module "1", the CCM computer and module "4", the ECM module.
The codes will show up for three seconds each and once all codes have been displayed, the speedometer will show three dashes. You can either turn the ignition off for five seconds and then back on to repeat the process or turn the ignition off and remove the short to restore normal operation.
To clear any codes, you can disconnect the battery for a few min.
This action will cause the speedometer and trip odometer to become a troubleshooting aid:
The codes will display on the speedometer. If there are no codes, the speedometer will show three dashes (---) and if the CCM cannot communicate with the other computers, the letters "ERR" will show up on the display.
The module number associated with the codes will be displayed on the odometer and will show which computer's codes is being displayed.
For the 1990 and 1991 Corvette, the modules are Module "1", the CCM computer and module "4", the ECM module.
The codes will show up for three seconds each and once all codes have been displayed, the speedometer will show three dashes. You can either turn the ignition off for five seconds and then back on to repeat the process or turn the ignition off and remove the short to restore normal operation.
To clear any codes, you can disconnect the battery for a few min.
