[alloro]

Cycle the ignition key On-Off-On-Off-On within 5 seconds.

Count the number of times the CEL (check engine light) on the instrument panel flashes on and off. The number of flashes represents the trouble code.

There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses separate individual two digit trouble codes.

Examples of a flashed DTC is as follows:
Lamp flashes 4 times, pauses, and then flashes 6 more times. This indicates a DTC code number 46. Lamp flashes 5 times, pauses, and flashes 5 more times. This indicates a DTC code number 55. A DTC 55 will always be the last code to be displayed. This indicates the end of all stored codes.

It might flash each code 3 times, I don't remember if that was the case in 89.