Engine Operating Mode Check

Engine Operating Mode, Checking


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


Special tools and equipment
- Scan tool VAG 1551 or vehicle system tester V.A.G 1552 with cable VAG 1551/3B

Test conditions
- Coolant temperature must be at least 85 °C, See display group 04, display zone 3

Test sequence
- Connect scan tool VAG 1551 (V.A.G 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 (ECM) [1][2][3]Connecting VAG 1551 Scan Tool
(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 (1-4 = 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.
- Quickly release accelerator pedal.

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 rewed up evenly, "part throttle" must be displayed
- Display: Part throttle

Enrichment:
- Floor accelerator pedal control throttle valve stop).

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

Full 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 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 attained:
- Check throttle valve control module. Testing and Inspection
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory. [1][2][3]Connecting VAG 1551 Scan Tool
- 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