Passat Syncro Sedan V6-2771cc 2.8L DOHC (AHA) (1999)
Intake Air Temperature Sensor: Testing and Inspection
Intake Air Temperature (IAT) Sensor, Checking
With Manufacturer's Scan Tool
Intake Air Temperature (IAT) sensor, checking
Special tools and equipment
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VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
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VAG1598/22 test box
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Multimeter Us1119 (Fluke 83 or equivalent)
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VW1594 connector test kit
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Wiring diagram
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Chilling spray (commercially available)
NOTE: If the sensor or sensor wiring malfunctions the engine control module operates with a substitute temperature of 25.5 °C (78 °F).
Checking
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Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1 - to insert "Engine Electronics" address word 01 (with ignition switched;
engine not running. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool
Indicated on display
Rapid data transfer
HELP
Select function XX
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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
HELP
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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Compare display with specified value for intake air temperature sensor (display field 4):