Disconnect the ECT/thermo sensor 3P connector from the sensor.
![](https://motoinstruction.ru/img/honda/9/116673.jpg)
Ground the ECT/thermo sensor 3P connector Green/blue terminal with a jumper wire.
![](https://motoinstruction.ru/img/honda/9/116674.jpg)
Turn the ignition switch to "ON" and check the coolant temperature indicator.
Disconnect the ECT/thermo sensor wire connector from the ground immediately if the indicator comes on.
If the indicator comes on, check the ECT/thermo sensor unit (see next page).
If the indicator does not come on, check for voltage between the sensor wire connector and ground.
If voltage is measured, the indicator box is faulty.
![](https://motoinstruction.ru/img/honda/9/116675.jpg)
If there is no voltage, check for voltage between the Brown/Ыаск and Green/blue wire terminals.
If there is no voltage between the terminals, the indicator box unit is faulty.
If voltage is measured, check the wire harness.