Cabrio GLX L4-2.0L (ABA) (2001)
Intake Air Temperature Sensor: Testing and Inspection
Intake Air Temperature (IAT) Sensor -G42-, Checking
Special tools and equipment
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VAG 1551 Scan Tool or VAG 1552 with cable VAG 1551/3
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Test box VAG 1598/22
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Hand multimeter VAG 1526 or multimeter VAG 1715
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Adapter set VAG 1594
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Wiring diagram
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Chilling spray (commercially available)
NOTE: If sensor or connecting wiring is faulty the control module operates with a substitute temperature of 19.5 degree C.
Test sequence
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Connect VAG 1551 Scan Tool ((VAG 1552). Then switch ignition on and select engine control module with "Address word" 01. (Connecting
scan tool and selecting engine control module See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Manufacturer's Scan Tool/Connecting VAG Scan Tool 1551/1552).
Indicated on display data
Rapid transfer
HELP
Select function XX
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Press keys 0 and 8 for function "Read Measuring Value Block" and confirm entry with Q key.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XX
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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 Measuring Value Block 4
->
1
2
3
4
Functional check of sensor
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Read 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:
Display1)
Cause
Approx. -46 degree C
Open circuit or short to positive
Approx. 141 degree C
Short to Ground
1) If a temperature is displayed which deviates greatly from the ambient temperature of the sensor, check sensor wiring for transfer resistances.
If the specification is obtained: