Temperature Gauge: Testing and Inspection

ERRATIC TEMPERATURE GAUGE OPERATION
1. Disconnect coolant temperature sender connector.

2. Connect a 1400 Ohm resistor between terminal B (Dark Green) of the coolant temperature sender and ground. Turn ignition ON.
^ If gauge reads cold, replace coolant temperature sender.
^ If gauge reads hot, repair or replace Dark Green wire (open circuit) or printed circuit board.

3. Connect a 55 Ohm resistor between terminal B (Dark Green) of the coolant temperature sender and ground. Turn ignition ON.
^ If gauge reads hot, replace coolant temperature sender.
^ If gauge reads cold, repair or replace Dark Green wire (short circuit) or printed circuit board.

TEMPERATURE GAUGE INDICATES HOT
1. Disconnect coolant temperature sender connector.

2. Turn ignition switch ON.
^ If gauge indicates HOT, check for short in Dark Green sender wire or printed circuit board.
^ If gauge indicates COLD, replace coolant temperature sender.

TEMPERATURE GAUGE INDICATES COLD
1. Disconnect coolant temperature sender connector.

2. Ground Dark Green coolant temperature sender wire. Turn ignition switch ON.
^ If gauge indicates COLD, check for open in Dark Green sender wire or printed circuit board.
^ If gauge indicates HOT, replace coolant temperature sender.