Golf GL L4-2.0L (AVH) (2002)
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Disconnect 5-pin connector from Mass Air Flow (MAF) sensor -G70- with Intake Air Temperature (IAT) sensor -G42- (arrow).
If indication jumps to approx. -40°C:
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
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Switch ignition off.
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Replace Intake Air Temperature (IAT) sensor (G42).
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Check DTC memory, repair any malfunctions and then erase DTC memory.
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing Diagnostic Trouble Codes
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
If indication remains at approx. 140°C:
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Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
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Switch ignition off.
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Check wires according to wiring diagram.
Checking wiring
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Remove wiper arms and wind cowl
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Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.