Golf GL L4-2.0L (AEG) (2001)
Intake Air Temperature Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Intake Air Temperature (IAT) Sensor -G42-, Checking
NOTE:
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If sensor or wiring is faulty the control module operates with a substitute temperature of 19.5 °C.
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The Intake Air Temperature (IAT) sensor -G42- is a part of the Mass Air Flow (MAF) sensor -G70- and cannot be replaced separately.
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
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VAG1921 hose clip pliers
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Chilling spray (commercially available)
Test sequence
NOTE: Only gold plated contacts must be used to repair the contacts in the intake air temperature sensor.
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Connect V.A.G1551 (VAG1552) Scan Tool (ST). See: 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 Action
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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
Read Measuring Value Block
Input display group number XXX
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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
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Read intake air temperature value in display field 4.