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Engine Coolant Temperature Sensor on Radiator, Checking|Page 2817 > < Engine Coolant Temperature Sensor on Radiator, Checking|Page 2815
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature Sensor, Checking

Engine Coolant Temperature Sensor, Checking

CAUTION!
‹› Cooling system is under pressure.

‹› Danger of scalding when opening!

‹› Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor (G62).

Special tools, testers and auxiliary items required

‹› Multimeter.

‹› jumper wire.

‹› Wiring diagram.

Test requirements

‹›  The Engine Control Module (ECM) (J623) fuses OK.

‹› Battery voltage at least 12.5 volts.

‹› All electrical consumers such as, lights and rear window defroster, switched off.

‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".

‹› A/C switched off.

‹› Ground (GND) connections between engine/transmission/chassis OK.

‹› Ignition switched off.

‹› Engine cold.

Test procedure

-

Perform a preliminary check to verify the customers complaint. Refer to =>  See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Mode 09 - Read Vehicle Information.

Start diagnosis

-

Connect the scan tool.

-

Switch the ignition on.

-

Using the scan tool, check the coolant temperature:

If the specified value is not obtained:

-

Continue test according to the following table:

If the specified value was obtained:

Engine Coolant Temperature Sensor on Radiator, Checking|Page 2817 > < Engine Coolant Temperature Sensor on Radiator, Checking|Page 2815