DR-7B Coolant Sensor Circuit to Computer

1. With ignition switch in Off position, connect coolant temperature sensor electrical connector.
2. Disconnect red and blue electrical connectors from logic module.
3. Connect an ohmmeter between red connector terminal No. 25 and blue connector terminal No. 23
4. If ohmmeter indicates resistance, replace logic module.
CAUTION: Before replacing the logic module, make sure the terminal in cavity No. 23 of the blue connector is not crushed so that it cannot touch the logic module pin.
5. If ohmmeter indicates an open circuit, check wiring between terminal No. 23 of logic module blue electrical connector and coolant sensor for an open circuit.