Passat Sedan 4Motion W8-4.0L (BDP) (2002)
Intake Air Temperature Sensor: Testing and Inspection
Checking Intake Air Temperature (IAT) sensor
NOTE: When servicing terminals in the harness connector for the Intake Air Temperature (IAT) sensor, use only gold-plated terminals.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
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Chilling spray (commercially available)
Test requirements
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
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Fuses -1, 2, 3, 4 and 7- in protective housing (plenum chamber, left) must be OK:
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Parking brake must be engaged or else daylight driving lights will be switched on.
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For vehicles with automatic transmission, selector lever must be in position -P-or -N-.
Function test
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Connect diagnostic tester. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan
Tool/Diagnostic Tester, Connecting
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Switch ignition on.
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Under address word 33, select "Diagnostic mode 1: Check measured values."
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Select the measuring value "PID 15: Intake air temperature".
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Check specified value of intake air temperature:
If specified value is not obtained:
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Continue test according to the following table:
Indicated 1)
Cause