FUEL LEVEL SWITCH
Disconnect harness from fuel level switch.
YES: Fuel level switch
has failed. Replace.
If indicator was ON, did it go OFF with harness
disconnected and key switch ON?
NO: Check harness.
If indicator was OFF, connect a jumper wire from
harness connector to ground.
Does indicator come ON when key switch is ON?
YES: Gauge and gauge
resistor are OK. Go to
temperature sensor (B9)
NO: Go to next check.
Disconnect 20-pin harness connector from monitor display and controller connector.
Connect 24 volts to 20-pin monitor display and controller pin 30.
Then ground pin 47.
Does gauge needle point to "C" with 24 volts applied to pin 30, and "H" with pin 47
YES: Gauge has failed.
RESISTOR (R4) CHECK
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.