Jetta GLS L4-1.8L Turbo (AWP) (2002)
Intake Air Temperature Sensor: Testing and Inspection
Intake Air Temperature (IAT) Sensor -G42-, Checking
Special tools and equipment
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VAG1551 scan tool or VAG1552 mobile scan tool with VAG1551/3B cable
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VAG1598/31 test box
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VAG1526 hand multimeter or VAG1715 multimeter
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VAG1594 adapter set
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Wiring diagram
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Chilling spray (commercially available)
Test sequence
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Connect VAG1551 scan tool (VAG1552). Switch ignition on and select engine control module with "Address word" 01. (Connecting scan tool
and selecting engine control module). Refer to "VAG1551 Scan Tool See: Tools and Equipment
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.
Indicated on display:
Read measured value block
HELP
Input display group number XXX
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Press keys 0, 0 and 4 for "Display group number 4" and confirm entry with Q key.
Indicated on display: (1 to 4 = Display zones)
Read measured value block 4
->
1
2
3
4
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Read off intake air temperature value in display zone 4.
Specification: approx. ambient temperature
If the specification is not obtained:
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Perform check according to following table: