Testing - Ford Ranger Maintaince And Repair Manual

The ECT sensor is mounted on the lower intake manifold near the water outlet/thermostat housing, except on
2.3L and 2.5L engines. On the 2.3L and 2.5L engine the ECT is mounted on the water outlet/thermostat
housing.

TESTING

1. Disengage the engine wiring harness connector from the ECT sensor.
2. Connect an ohmmeter between the ECT sensor terminals, and set the ohmmeter scale on 200,000
ohms.
3. With the engine cold and the ignition switch in the OFFposition, measure and note the ECT sensor
resistance. Attach the engine wiring harness connector to the sensor.
4. Start the engine and allow the engine to warm up to normal operating temperature.
5. Once the engine has reached normal operating temperature, turn the engine OFF
6. Once again, detach the engine wiring harness connector from the ECT sensor.
7. Measure and note the ECT sensor resistance, then compare the cold and hot ECT sensor resistance
measurements with the accompanying chart.
8. Replace the ECT sensor if the readings do not approximate those in the chart, otherwise reattach the
engine wiring harness connector to the sensor.
Submerge the end of the temperature sensor in cold or hot water and check resistance
OPERATION
HOW TO USE THIS BOOK
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