Fast Codes

At the start of KOEO SELF-TEST, and after Wide Open Throttle (WOT) request in KOER SELF-TEST, there is an output from the ECA known as Fast Codes. These are short bursts of information used by manufacturer during assembly. With most equipment, these code bursts are not visible; as the entire code sequence lasts less than 1/2 second. If this fluctuation is visible on test equipment, ignore it.

Fig 1: Reading Codes (2-Digit Codes Shown, 3-Digit Codes Similar)

Courtesy of FORD MOTOR CO.

Fig 2: Self-Test Connector Equipment Hookup

Courtesy of FORD MOTOR CO.

Fig 3: Fault Diagnosis Flow Chart (EEC-IV)

Courtesy of FORD MOTOR CO.