YES: Gauge has failed.
RESISTOR (150 OHMS)
NO: Gauge resistor has
NOTE: Check engine coolant temperature gauge before checking resistor. Resistor is
located on bottom of the monitor controller panel. Access resistor by removing bottom
cover from monitor controller panel.
Connect ohmmeter to resistor terminals.
NOTE: Check engine coolant temperature gauge before
YES: Sender is OK.
Disconnect harness from temperature sender.
NO: Sender has failed.
Connect ohmmeter to sender and ground.
Start engine and observe ohmmeter.
Does ohmmeter reading decrease as engine becomes