DR-3A Fault Code 15 Speed Sensor Circuit

1. With diagnostic read-out tool connected to engine harness connector, start engine, then disconnect speed sensor connector.
2. Place system in Engine Running Test Mode 71.
3. Connect and disconnect a jumper wire between terminals of speed sensor harness connector.
4. If display on read-out tool changes, replace speed sensor.
5. If display on read-out tool does not change, proceed to Test 3 step B. DR-3B Speed Sensor Circuit to Logic Module