Sending Unit Test

WARNING: This page is about a different car, the 2002 Honda Accord, 2001 Honda Accord, 2000 Honda Accord, 1999 Honda Accord, and 1998 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

'98-99 models:

Disconnect the YEL/GRN wire (A) from the coolant temperature gauge sending unit (B).

Fig 1: Disconnecting YEL/GRN Wire From Coolant Temperature Gauge Sending Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Using an ohmmeter, measure the change in resistance between the positive terminal (C) and the engine (ground) with the engine cold and with the engine at operating temperature.

Sending Unit Test Table

Temperature	133°F (56°C)	185°F (85°C)-212°F (100°C)
Resistance (Ω)	137	46-30

If the obtained readings are substantially different from the specifications above, replace the sending unit.