Temperature Sensor (Gauge): Testing and Inspection

1. Check the No. 13 (15 A) fuse in the under-dash fuse/ relay box before testing.
2. Make sure the ignition switch is OFF, then disconnect the YEL/GRN wire from the coolant temperature gauge sending unit, and ground it with a jumper wire.
3. Turn the ignition switch ON (II).
- Check that the pointer of the coolant temperature gauge starts moving toward the "H" mark.

CAUTION: Turn the ignition switch OFF before the pointer reaches "H" on the gauge dial. Failure to do so may damage the gauge.

- If the pointer of the gauge does not move at all, check for an open in the YEL/GRN wire. If the wires are OK, replace the coolant temperature gauge.
- If the coolant temperature gauge works, test the coolant temperature sending unit.