Passat Syncro Wagon V6-2.8L (ATQ) (2000)
Intake Air Temperature Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Intake Air Temperature (IAT) sensor, checking
Special tools and equipment
-
V.A.G 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
-
VAG 1598/31 test box
-
VAG 1526 multimeter or VAG 1715 multimeter
-
VAG 1594 connector test kit
-
Wiring diagram
-
Chilling spray (commercially available)
Test sequence
-
Connect V.A.G 1551 scan tool (VAG 1552). Switch ignition on and select Engine Control Module (ECM) using address word 01. See: 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
-
Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
-
Press 0, 0 and 4 for function "display group number 4", and then press Q to exit from input mode.
Indicated on display (1 - 4 = display fields)
Read Measuring Value Block 4
->
1
2
3
4
-
Read Intake Air Temperature (IAT) value in display field 4.
Specification: approx. ambient temperature
If specified value is not obtained:
-
Continue testing according to following table:
Indicated
cause
approx.-48°c
Break or short to B+
approx.143°c
short circuit to GND
1) If a temperature is indicated which is below the ambient temperature of sensor, first check sensor wires for contact resistance.Note that while the
vehicle is standing still the sensor might warm up due to radiant heat.
If the specified value is met: