Pinpoint Test STO - Self-Test Output
WARNING: This page is about a different car, the 1995 Ford Aspire. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Enter this test only when codes cannot be retrieved or when directed by PINPOINT TEST STI.
STO CIRCUIT PIN IDENTIFICATION
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| STO | 1F | 17 | WHT/BLK |
1) Turn ignition off. Install BOB, leaving PCM disconnected. Measure resistance between STO test pin and STO terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair circuit between PCM and self-test connector.
2) Measure resistance between STO test pin and ground. If resistance is less than 10,000 ohms, repair shorted STO wire. Turn ignition on. Measure voltage between STO test pin and ground. If voltage is not zero, go to PINPOINT TEST PGC.