Jetta Sedan V6-2.8L (BDF) (2003)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
With Manufacturer's Scan Tool
Engine Coolant Temperature (ECT) Sensors -G62- and -G2-, Checking
NOTE: The Motronic Engine Control Module (ECM) -J220- will use a replacement value for an engine start (start temperature replacement value) as
soon as there is a Diagnostic Trouble Code (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 control module. When the engine has reached normal working temperature a fixed replacement
value will be displayed after a certain period.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable
NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.
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VAG 1526 Hand multimeter or VAG 1715 multimeter
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VAG 1594 Adapter set
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VAG 1598/31 Test box
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Electrical Wiring Diagrams
Test prerequisites
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Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
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Engine must be cold.
Test sequence
NOTE: Only gold plated terminals may be used when servicing the sensor connector terminals.
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Connect VAG 1551 Scan tool (or VAG 1552). Then switch ignition on and select Motronic Engine Control Module (ECM) -J220- with the
"Address word" 01. ((VAG 1551 and Motronic Engine Control Module (ECM) -J220-, connecting and selecting).
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.
Indicated on display:
Read measured 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 to 4 = display zones)
Read measured value block 4
->
1
2
3
4
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Read coolant temperature value in display zone 3.
Specification: approx. coolant temperature