Carlos,

What you do on our SR's (pre ODB/96's) is... ground the terminal # 1 plug...(under the steering wheel/ right near the brake peddle)

then turn the ign on... the "check engine" light will flash the sequence of codes with a 2sec pause in between each one..

If you have 23 error, the light will flash twice with a 2sec pause followed by 3 more times... then a LONG pause...

if nothing..it'll repeat the code again....

simple as that..

Jason