Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
Intake Air Temperature Sensor: Testing and Inspection
Intake Air Temperature sensor, checking
Special tools, testers, measuring instruments and auxiliary items required
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VAG 1551/1552 Scan Tool with VAG 1551/3B adaptor cable
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VAG 1598/22 Test Box
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Fluke 83 Multimeter
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VW 1594 Adaptor kit
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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 fixed substitute temperature of 19.5 °C.
Test sequence
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Connect VAG 1551/1552 Scan Tool, See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting
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Switch ON ignition
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Press 0 and 1 buttons to select "Address word" 01 "Engine electronics"
Display will appear as shown
Rapid data transfer
HELP
Select function XX
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Press 0 and 8 buttons to select Function 08: "Read measuring value block"
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Press Q button to enter input
Display will appear as shown
Read measuring value block
HELP
Input Display group number XXX
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Press 0, 0 and 4 buttons to select "Display group 4"
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Press Q button to enter input
Display will appear as shown (1 to 4 = Display zones)
Read measuring value block 4
->
1
2
3
4
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Check specification for Intake Air Temperature sensor, Display zone 4: