I don't think it has one. You have to pull back the the carpet on passenger side and look at the ecu. Place key into ignition turn to on position and count the number of blinks it gives you. It may give you more then one code so be careful as to your count and amount of codes. you can e-mail and I will let you know what each one stands for. valrey71@hotmail.com is your engine light staying on?
There isn't a crx diagnostic plug on any vehicle prior to 1996
0.044
44
.044 mm
The spark plug gap on a 1989 Honda CRX Si is .044 mm. Auto part stores carry these plugs pre-gapped to make for easy installs.
CRX
To fill the transmission on the Honda CRX, first use a 19 mm wrench to remove the fill plug on the side of the transmission. Then, fill the reservoir at the side of the transmission.
1-3-4-2
The 1986 Honda CRX already has a 1.5.
Civic Racing eXperiment = CRX
Honda produced the CRX from 1983 to 1991. Honda is releasing a car in 2011 called the CR-Z, it is a hybrid remake of the CRX. Check it out!
For crx si the hp is 108.