Jetta L4-2.0L (AEG) (2000)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
With Manufacturer's Scan Tool
Engine Coolant Temperature Sensor, Checking
NOTE: Engine Control Module (ECM) will use the intake air temperature as a replacement value for an engine start (start temperature replacement
value) when a malfunction is stored in DTC memory that affects the Engine Coolant Temperature (ECT) sensor -G62-. The temperature rises according
to a model stored in the control module. When the engine has reached normal operating temperature, a fixed replacement value will be displayed after a
certain period. This fixed value is also dependent upon the intake air temperature.
Special tools and equipment
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V.A.G1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
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VAG1598/22 test box
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Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
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Wiring diagram
Test conditions
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Engine cold
Test sequence
NOTE: Only gold plated contacts must be used to repair contacts -1- and -3- in the harness connector for the coolant temperature sensor.
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Connect V.A.G1551 (VAG1552) Scan Tool (ST). See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading
and Clearing Diagnostic Trouble Codes/Scan Tool Connecting
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Turn on ignition and press buttons -0- and -1- to insert "Engine Electronics" address word 01.
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
-
Press buttons -0-, -0- and -4- to input display group number 4 (004) and press -Q- button to confirm input.
Indicated on display: (1-4 = display fields)
Read Measuring Value Block 4
->
1
2
3
4
-
Read off coolant temperature value in display field 3.