A3 L4-2.0L Turbo (CBFA) (2008)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature Sensor, Checking
Observe all safety precautions.
View clean working conditions.
Prior to repair work, perform a preliminary check to verify the condition. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Preliminary Check
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
Special tools, testers and auxiliary items required
-
Generic scan tool
-
Multimeter
-
Wiring diagram
Test requirements
-
The Motronic 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
Start diagnosis
-
Connect the scan tool.
-
Switch the ignition on.
-
Using the scan tool, check the coolant temperature:
Diagnostic text
Specified value
Coolant temperature
Approx. coolant temperature
If the specified value is not obtained:
-
Continue test according to the following table:
If the specified value was obtained:
-
Start the engine and let it run at idle.