Ignition/Glow Plug System

Intake Air Temperature Sensor, Checking





Special tools, testers and auxiliary items required

• Multimeter (V.A.G 1526 A)

• Connector test kit (V.A.G 1594 A)

• Test box (VAG1598/31)

• Vehicle diagnostic, testing and information system ( VAS 5051) with VAS 5051/1 B Adapter

Component location=> [ (Item 14) ] Locations

Work sequence

- Connect vehicle diagnostic, testing and information system (VAS 5051) => [ VAS5051, Connecting and Selecting Functions ] VAS 5051, Connecting and Selecting Functions and select vehicle system "01 -Engine electronics" in selection. Engine must be running at idle.

Display on (VAS 5051):





- Under - 1 - select diagnostic function "08 - Read measured value block".

Display on (VAS 5051):





1 - Display group input

- Enter "004" for "display group number 004" in zone - 2 - and confirm entry by pressing Q button.

Display on (VAS 5051):





- Check Intake Air Temperature (IAT) sensor in display zone - 4 -.





* If a temperature is displayed which deviates greatly from the ambient temperature of the sensor, check sensor and sensor wiring for terminal resistances and open circuit.

- Exit function "08 - Read measured value block" by pressing arrow button.

Checking wiring

- Disconnect connector to Intake Air Temperature (IAT) sensor (G42).

- Connect test box (VAG1598/31) to wiring harness for ECM; do not connect ECM => [ Electrical Testing, with Test Box VAG 1598/31 ] Electrical Testing, With Test Box VAG 1598/31.

- Check for open circuit, short to positive, or short to ground in following wiring connections:









- Test for short circuits between two wires.

- Repair any open/short circuit as necessary.

If no wiring problems are found:

Checking sensor

- Connect multimeter to sensor to measure resistance.





Specifications





If the specified values are not obtained:

- Replace Intake Air Temperature (IAT) sensor ( G42).