DR-3C Checking Speed Sensor Circuit

1. With ignition switch in Run position, disconnect 40-way bulkhead electrical connector.
2. Connect a voltmeter between logic module blue electrical connector terminal No. 14 and ground.
3. If voltmeter indicates at least 4 volts, check wire from logic module blue electrical connector terminal No. 14 to speed sensor for an open circuit.
4. If voltmeter indicates no voltage, replace logic module.
CAUTION: Before replacing the logic module, make sure the terminal in cavity No. 14 is not crushed so that it cannot touch the logic module pin.