Temperature Gauge: Testing and Inspection

INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE OPERATION




a. Disconnect the connector from the sender gauge.
b. Turn the ignition switch ON and check that the receiver gauge needle indicates COOL.




c. Ground terminal on the wire harness side connector through a 3.4-W test bulb.
d. Turn the ignition switch ON, and check that the bulb lights up and the receiver gauge needle moves to the hot side.
If operation is as specified, replace the sender gauge. Then recheck the system.
If operation is not as specified, measure the receiver gauge resistance.

INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE RESISTANCE







Measure the resistance between terminals.

HINT: Connect the test leads so that the current from the ohmmeter can flow according to the above order.
This circuit includes the diode.
If resistance value is not as specified, replace the receiver gauge.

INSPECT ENGINE COOLANT TEMPERATURE SENDER GAUGE RESISTANCE







Connect the wire harness as shown in the illustration, and enter value in the left formula. Check the resistance conforms to the values in the table.
If resistance value is not as specified, replace the engine coolant temperature sender gauge.