Temperature Gauge: Testing and Inspection

ENGINE COOLANT TEMPERATURE (ECT) GAUGE / TEST
1. Check the No. 25 (7.5 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 ECT gauge sending unit and ground it with a jumper wire.
3. Turn the ignition switch ON (II).
Check that the pointer of the ECT 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 or YEL/GRN wire. If the wires are OK, replace the ECT gauge.
- If the ECT gauge works, test the ECT sending unit.