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Ford Historic (OBD I) Diagnostics

✓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.

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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)

✓If necessary, refer to an appropriate service manual for the procedure on how to use STAR Test Mode for the specific vehicle under test.

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