yo Medic2DaResq,
Sorry for the delay in replying, I had to get some body work done (not on the Bronco, my bod..lol)
Fast DTCs are issued before slow service DTCs. These DTCs contain the identical information as the slow DTCs, but are transmitted at 100 times the normal rate. These DTCs are interpreted by special equipment at the end of the assembly line by the Body and Assembly Division, as well as the SUPER STAR II tester. After Fast DTCs have been output, Self-Test should not be exited (remove jumper, unlatch button, etc.) until all the Slow DTCs have been output. Exiting before slow DTCs have been output will erase any Continuous Memory DTCs.
Some meters in service detect these codes as a short burst of information (slight meter deflection).
Ryan M also addresses this in his self test @
http://oldfuelinjection.com/?p=13
When the “Check Engine” light blinks during the test you will get several different blinks, the separation time between blinks is used to indicate what information is being displayed.
Turn key to RUN.
You will hear some relays engage and the fuel pumps prime the system. This is the EEC beginning the test.
The fuel pumps will stop and the EEC will now begin giving codes.
You may catch a brief flickering of the light. This is a rapid code read that is used by the code readers you can purchase. Do not worry all those rapid flashes you just say flicker buy will now be given at a slower pace of �, 2, & 4 second pauses.
First digit of first KOEO code (1/2 second between blinks)
2 second pause
Second digit of first KOEO code (1/2 second between blinks)
4 second pause
Next KOEO code
Once all KOEO codes are read the EEC will repeat them
6 second pause
Single Separator Blink (this indicates the change from KOEO codes to CM codes)
6 second pause
Codes from Continues Memory (uses same 1/2, 2, and 4 second timing as KOEO codes and also repeats them)
If nothing has been recorded by the EEC since last battery disconnect you will see:
Blink – 2 sec – blink – 4 sec – blink – 2 sec – blink – 6 sec – blink – 6 sec – blink – 2 sec – blink – 4 sec – blink – 2 sec � blink
This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS
This may seem hard to count; recommendation is to record codes with slashes, and to lump them all together. Sort them out into numerical codes later. Here is an example of this