With Manufacturer's Scan Tool

Engine operating mode, checking

NOTE: Checks whether engine control module recognizes the engine operating modes idling, overrun, part throttle, enrichment, wide open throttle.

Special tools equipment
- V.A.G1551 scan tool or V.A.G1552 mobile scan tool with V.A.G1551/3B cable

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

Test sequence
- Connect V.A.G1551 scan tool (V.A.G1552). Start engine and select "Address word" 01 of engine control module. Engine must be running at idling 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 keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.

Indicated on display

Read measured value block
Input display group number XXX

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

Indicated on display: (1 to 4 = Display zones)

Read measured 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 idling 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: Below 1400 RPM idling speed will be recognized.

Part throttle:
- Rev up evenly.

As long as the engine is being revved up evenly, part throttle must be displayed

Display: Part throt.
Enrichment:

- Floor accelerator pedal (onto throttle valve stop).

Acceleration enrichment must be displayed briefly

Display: Enrichment

Observe the valid safety precautions when performing a road test.

- Press -> key.
- Press keys 0 and 6 for "End data transfer" function and confirm input with Q key.

If the specifications are not attained:
- Check throttle valve control module.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory. DTC Memory, Checking and Erasing (Functions 02 and 05)
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes