Checking Function
Exhaust Gas Temperature Sensor, Checking Function
Special tools and equipment
- VAS5051 with VAG5051/1
or
- VAG1551 with VAG1551/3A
Test requirement:
- Coolant Temperature at least 80 °C.
WARNING!
- During a road test in an airbag equipped vehicle, test equipment must always be fastened to and operated from the rear seat by a second technician.
- When driving or riding in an airbag equipped vehicle, NEVER hold the scan tool or other test equipment in your hands or lap while in motion. Objects between you and the airbag increase the risk of injury in an accident.
Test sequence
- Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01 Engine must run at idle for this.
When indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.
When indicated on display
Read Measuring Value Block Q
Input display group number XXX
- Press buttons -1-, -1- and -2- to select "display group number 112" and press -Q- button to confirm input.
Indicated on display (1...4 display fields)
Read Measuring Value Block 112 ->
1 2 3 4
- Check exhaust gas temperature.
- Road test vehicle to check exhaust gas temperature.
- Wide Open Throttle (WOT) at engine speeds between 5000 ... 6500 RPM must be reached.
NOTE: Exhaust gas temperature must rise to above 980 °C so that regulation sets in. Values below 945 °C are displayed as 945 °C.
Display Group 112:
If values above 20 % are displayed constantly, then
- fuel pressure may be too low,
- mass air flow sensor signal may be too small.
- Select measuring value block 220.
Indicated on display (1...4 display fields)
Read Measuring Value Block 220 ->
1 2 3 4
- Check exhaust temperature regulation.
Display Group 220:
- Repeat test for bank 2 See measuring value block 221
If specified values are not obtained and there is a malfunction stored in DTC memory:
- Check exhaust gas temperature sensor.