With Manufacturer's Scan Tool

Engine Operating Mode, Checking

NOTE: Checks whether Engine Control Module (ECM) recognizes the engine operating modes idling, overrun, part throttle, enrichment, wide open throttle.

Special tools, test equipment and auxiliary items
- VAG 1551 scan tool (or VAG 1552 mobile scan tool) with VAG 1551/3B cable

Test conditions
- Coolant temperature must be at least 80°C, see display group 04, display zone 3

Test sequence
- Connect VAG 1551 scan tool ((VAG 1552). Start engine and select "Address word" 01 of engine control module. Engine must be running at idle speed. Connecting scan tool and selecting Engine Control Module. [1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- for function "Read measuring value block" and confirm entry with -Q- button.

Indicated on display

Read measuring value block
Input display group number XXX

- Press buttons -0-, -0- and -5- for "Display group number 5" and confirm entry with -Q- button.

Indicated on display (1 to 4 = Display zones)

Read measuring value block 5 ->
1 2 3 4

- Check whether control module recognizes operating mode (display zone 4).

Idling:
As long as the engine is running at idle speed "idling" must be displayed
- Display: Idling

Overrun mode:
- Increase engine speed to above 3000 RPM.
- Close throttle abruptly.

As long as the engine speed is above 1400 RPM "overrun" must be displayed
- Display: Overrun

NOTE: A test drive may have to be performed to show "Overrun" in display.
Observe the valid safety precautions when carrying out a road test.

Part throttle:
- Rev up evenly.

As long as the engine is being revved up evenly, "part throttle" must be displayed
- Display: Part throttle

Enrichment:
- Floor accelerator pedal (onto throttle valve stop).

Acceleration "enrichment" must be displayed briefly
- Display: Enrichment

Wide open throttle:
- Floor accelerator pedal (onto throttle valve stop).

"Full throttle" must be displayed briefly
- Display: Full throttle

NOTE: A test drive may have to be performed to show "Full throttle" in the display.
Observe the valid safety precautions when carrying out a road test.

- Press -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.

If the specifications are not obtained:
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, Checking and Erasing DTC Memory. Reading Diagnostic Trouble Codes
- Check accelerator mechanism for ease of operation.
- Check throttle valve control module, Checking Throttle Valve Control Module -J338-. Throttle Valve Control Module, Checking
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from battery positive, readiness code must be generated again. Monitors, Trips, Drive Cycles and Readiness Codes