Ford Historic (OBD I) Diagnostics
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6
✓With the STI in the TEST state, the self-test begins. The Self-Test
Output (STO) parameter flashes either a HIGH or LOW. A beep
accompanies each LOW flash. Write down the 2– digit or 3 – digit
code for reference.
✓Disregard the blink which may occur when ignition key is turned
on. Depending on the vehicle being tested, determines if a three
digit or 2 digit code is used. If required, refer to the service manual
for applicable code structure.
❒A digit consists of consecutive LOW flashes or beep — count
the number of LOWs for the digit
❒A short HIGH (short pause) occurs between digits.
❒A long HIGH (long pause) occurs between codes.
❒There is no flash for the digit 0 (zero).
✓After all codes are sent, the series repeats once and then stops.
An example is shown below.
✓If necessary, refer to an appropriate service manual for the
procedure on how to use STAR Test Mode for the specific vehicle
under test.
3. Return to the On Demand Test Menu.
•Press BACK.
A Three-Digit DTC (214) will Flash as follows:
STO: LOW-LOW =2XX (Hundreds Place =2)
STO: HIGH Short Pause
STO: LOW =21X (Tens Place =1)
STO: HIGH Short Pause
STO: LOW-LOW-LOW-LOW =214 (Ones Place =4)
Two-Digit DTCs (12, 42) will Flash as follows:
STO: LOW =1X (Tens Place =1)
STO: HIGH Short Pause
STO: LOW-LOW =12 (One’s Place =2)
STO: HIGH Long Pause (Between DTCs)
STO: LOW-LOW-LOW-LOW =4X (Tens Place =4)
STO: HIGH Short Pause
STO: LOW-LOW =42 (Ones Place =2)