Throttle Valve, Checking For Soiling

Throttle Valve, Checking For Soiling

Requirements
- An original equipment air filter must be installed and it must be OK.
- Intake air guide OK.
- Fuel pressure OK.
- Tank ventilation OK.
- Fuel injectors OK.
- Coolant temperature > 80 degrees C.
- Oxygen sensor adaptation values and control OK.

Checking oxygen sensor adaptation values and control

Work sequence
- Connect VAS5051 tester, Vehicle Diagnostic, Testing and Information System VAS 5051, Connecting and Selecting Functions and select vehicle system "01 - Engine electronics". Engine must run at idle during this.







Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic Setting".







Display on VAS5051:
1 - Enter display group

Max. input value = 255
- Select function "032" in button field -2- for "display group number 032" and press Q button to confirm input.







Display on VAS5051:
- Check specified value in display field -2-.







Work sequence
- Disconnect electrical harness connector from Mass Air Flow (MAF) sensor.
- Connect VAS5051 tester, Vehicle Diagnostic, Testing and Information System VAS 5051, Connecting and Selecting Functions and select vehicle system "01 - Engine electronics". Engine must run at idle during this.

Requirement
- Engine running at idle select "address word" 01 and "04" the "Initiate Basic Setting" function.







Display on VAS5051:
1 - Enter display group
- Enter "107" in button field -2- for "display group number 107" and press Q button to confirm input.







Display on VAS5051:
- Check indication in display field -4-.







If specified value "System OK" is obtained in display field 4:
- Click on <- button
- Re-connect Mass Air Flow (MAF) sensor.
- For further fault-finding, perform the next test step in the DTC table.

If specified value "System OK" is not obtained in display field 4:
- Click on <- button
- Clean air guide in throttle valve control module using a lint-free cloth and methylated spirits.
- Adapt throttle valve control module. Programming and Relearning
- Repeat test sequence: Oxygen sensor control-short trip, measuring value block 107 in Basic Setting 04.
- Re-connect Mass Air Flow (MAF) sensor.
- Check DTC memory and erase it if necessary. Diagnostic Trouble Code (DTC) Memory, Erasing (Function 05)
- Perform a road test. Observe safety precautions
- Re-check DTC memory. Diagnostic Trouble Code (DTC) Memory, Checking (Function 02)