Golf GTI V6-2792cc 2.8L DOHC (AAA) SFI (1998)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Special tools, testers and auxiliary items:
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VAG 1551/1552 scan tool with VAG 1551/3 adapter cable.
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VAG 1598/18 test box.
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Multimeter (Fluke 83 or equivalent).
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Connector test kit VW 1594.
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Wiring diagram.
Test conditions:
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Engine cold
Test sequence:
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Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection When doing this ignition must be switched on.
Indicated on display
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
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Press buttons -0-, -0- and -1- to input display group 001 and press -Q- button to confirm input.
Indicated on display (1-4 = Display fields)
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Check the specification for coolant temperature sensor (display field 2).
Continuation
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Start engine and run at idle speed.
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The temperature value must increase uniformly.
If the specification is not attained:
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Replace Engine Coolant Temperature (ECT) sensor -G62-.
WARNING:! The cooling system is pressurized when the engine is warm. When opening the expansion tank, wear gloves and other appropriate
protection, cover the cap with a cloth, and open carefully to relieve system pressure slowly.
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
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Switch ignition off.