Test F: Engine Coolant Temperature Gauge: 1995-1999

NOTE: See WIRING DIAGRAMS  for engine coolant temperature (ECT) gauge circuit.

1. Before testing, check the fuse No. 5 (10 A) in the under-dash fuse box.
2. Make sure the ignition switch is OFF, then disconnect the YEL/GRN wire from the ECT sending unit and ground it with a jumper wire. See Fig 1.
CAUTION: Turn the ignition switch OFF before the pointer reaches the "H" mark on the gauge dial; if you don't, you may damage the gauge.
3. Turn the ignition switch ON. Check that the pointer of the ECT gauge starts moving toward the "H" mark.
   • If the pointer of the gauge does not swing at all, check for an open in the YEL or YEL/GRN wire or replace the ECT gauge if the fuse and wiring is OK.
   • If the ECT gauge is OK, check the sending unit.

Fig 1: Testing Coolant Temperature Gauge

Courtesy of AMERICAN HONDA MOTOR CO., INC.