Engine Coolant Temperature (ECT) Gauge Test

CAUTION: Turn ignition switch to OFF position before gauge pointer reaches "H" mark, or ECT gauge may be damaged.

Check fuse No. 1 (10-amp) on 2.5TL and 3.2TL or fuse No. 20 (20-amp) on 3.5RL, located in underdash fuse/relay box in left kick panel. Turn ignition switch to OFF position. On 3.5RL, remove engine cover. On all models, disconnect Yellow/Green wire from Engine Coolant Temperature (ECT) sending unit. Sending unit is located in middle of engine.
Using a jumper wire, ground ECT sending unit Yellow/Green wire. If ECT gauge pointer does not move, check for poor connections or open in Yellow/Green wire between ECT sending unit and ECT gauge. If wire is okay, replace ECT gauge. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. If ECT gauge pointer moves, check ECT sending unit. See ENGINE COOLANT TEMPERATURE (ECT) SENDING UNIT TEST .