So the CEL has started flashing on my 92 loyale, running or just ignition on. I connected the green connectors at the firewall, turned the ignition on, and get five pulses out of the ecu. But, I also get the same five pulses out of the ecu with the green connectors disconnected, ignition on. Any ideas?

There is a whole procedure to use the diagnostic connectors.  Simply connecting them does not do much.  It should be listed in a link somewhere, it's in the factory service manual.

 

To read an active code, you don't need to connect any.  The code is blinked on an LED visible through a hole on the ECU, which is covered by a plastic panel under the steering column.

 

The CEL does not blink the codes.

Thank you for the reply. I am aware that the cel does not blink the codes. I have am familiar with the procedure. However, as stated before, the check engine light is blinking. Upon trying to pull codes from the ecu under the dash, all I get is 5 long blinks. I cannot reference a code for this scenario, nor do I know why the CEL is blinking.

Edited August 26, 20178 yr by Brat78

Green is for timing and some "active" testing.

 

actually the white connectors are the stored code readout connectors.

 

If you have them hooked up, and the IG. is on with no codes in memory, it will do as you describe.