New Beetle L4-2.0L (AZG) (2003)
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
With Manufacturer's Scan Tool
Engine Coolant Temperature (ECT) Sensor, Checking
NOTE: The Engine Control Module (ECM) will use a replacement temperature value for an engine start as soon as there is a DTC stored in the DTC
memory which affects the Engine Coolant Temperature (ECT) sensor (G62). The temperature then rises according to a model stored in the ECM. When
the engine has reached normal working temperature a fixed replacement value will be displayed after a certain period. This fixed value is also dependent
on intake air temperature.
Special tools and equipment
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Scan tool VAG 1551 or vehicle system tester V.A.G 1552 with cable VAG 1551/3B
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Test box V.A.G 1598/31
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Hand multimeter V.A.G 1526 or multimeter VAG 1715
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Adapter set V.A.G 1594
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Wiring diagram
Test conditions
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Engine must be cold
Test sequence
NOTE: Only gold-plated terminals must be used to repair the terminals in the connector for the Engine Coolant Temperature (ECT) sensor.
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Connect scan tool VAG 1551 (V.A.G 1552). Then switch ignition on and select engine control module with "Address word" 01.
Connecting scan tool and selecting Engine Control Module (ECM). See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting
Indicated on display
Rapid data transfer
HELP
Select function XX
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Press buttons 0 and 8 for function "Read Measuring Value Block" and confirm entry with Q button.
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 number 4" and confirm entry with Q button.
Indicated on display (1-4 = Display zones)
Read Measuring Value Block 4
->
1
2
3
4
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Read off coolant temperature value in display zone 3.
Specification: approx. coolant temperature
If the specification is not obtained:
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Perform check according to following table:
