3A Fault Code 15 Speed Sensor Circuit

1. Connect diagnostic read-out tool to engine test connector, then start engine.
2. Disconnect speed sensor connector, then put the system into engine running test mode 71.
3. Connect a jumper wire between speed sensor harness connector terminals. Make and break this connection.
4. If display on read-out tool changes while making and breaking connection, replace the speed sensor.
5. If display on read-out tool does not change while making and breaking connection, proceed to step B. 3B Speed Sensor Circuit