Equipment Hook-Up: VOM

1)  Turn ignition off. Connect a jumper wire from STI connector to ground. Refer to SELF-TEST CONNECTOR LOCATION and SELF-TEST CONNECTOR WIRE COLORS tables. See Fig 1 .

Fig 1: Identifying Self-Test Connector Terminals

Courtesy of FORD MOTOR CO.

2)  Connect VOM between STO terminal and engine ground. Set VOM to measure 0-20 volts DC.