I'm trying to t-shoot an engine check lite that comes on after my 88 lx-i has been running for about 5 minutes. The car runs great even when the lite is on. Even when it's warm, if I turn the ignition off then back on, it'll come back on in 5 more minutes. I thought an engine check lite would be permanently illuminated once a fault was detected by the ECU. Guess not though.

Someone told me I could view lites on the ECU and isolate the source of the fault based on blinking patterns. Is this true?

Any advice would be appreciated. I believe an 88 is pre-OBD, so I can't scan for codes. By the way, where the h is the ECU? Just got the car and am in the process of replacing, fixing, cleaning, etc.

Rocky
Near Seattle

 

The ECU is under the drivers seat. Put the seat all the way foward, flip the little door on the back down and count the blinks.