Beetle L4-2.0L (AEG) (2000)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature (ECT) Sensor, Checking
With Manufacturer's Scan Tool
Engine Coolant Temperature Sensor, checking
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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VAG 1551/1552 Scan Tool using VAG 1551/3 Adaptor cable
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VAG 1598/22 Test Box
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Fluke 83 multimeter
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VW 1594 Adaptor kit
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Wiring diagram
Requirement
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Engine must be cold
NOTE:
The Engine Control Module (ECM) uses Intake Air Temperature as a replacement value for engine starting (start temperature replacement value) if there
is a malfunction stored in DTC memory which affects the Engine Coolant Temperature (ECT) sensor G62. The temperature then rises according to a
model stored in the ECM. Shortly after the engine reaches operating temperature a constant replacement value will be displayed. This value is also
dependent upon Intake Air Temperature.
Test sequence
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Connect VAG 1551/1552 Scan Tool. See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes/Scan Tool Connecting
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Switch ON ignition.
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Press 0 and 1 buttons to select "Engine Electronics" address word 01.
Indicated on display (example only)
06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000
WSC 00000
-
Press -> button.
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press 0 and 8 buttons to select "Read Measuring Value Block" function 08.
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Press Q button to enter input.
Indicated on display
Read measuring value block
Input Display group number XXX
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Press buttons 0, 0 and 4 for "Display group 4."
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Press Q button to enter input.
Indicated on display (1 to 4 = Display fields)
Read measuring value block 4 ->
1
2
3
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Note Engine Coolant Temperature value in Display field 3.