Engine Operating Mode Check
Engine Operating Modes, Checking
NOTE: This procedure checks whether the Engine Control Module recognizes the engine operating modes: Closed Throttle, Decel, Partially Open Throttle, Enrichment and Wide Open Throttle.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1551/1552 Scan Tool using VAG 1551/3 Adaptor cable
Requirements
- Throttle cable adjustment must be OK. Checking:
- Engine Coolant Temperature 85 °C minimum See Display group 04, Display field 3.
Test sequence
- Connect VAG 1551/1552 Scan Tool. [1][2][3][4]Reading and Clearing Diagnostic Trouble Codes
- Start engine and let idle
- Press 0 and 1 buttons to select "Engine Electronics" address word 01.
Indicated on display (example only)
06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000 WSC 00000
- Press -> button.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press 0 and 8 buttons to select "Read Measuring Value Block" function 08.
- Press Q button to enter input.
Indicated on display
Read measuring value block
Input Display group number XXX
- Press 0, 0 and 5 buttons to select "Display group 5."
- Press Q button to enter input.
Indicated on display (1 to 4 = Display fields)
Read measuring value block 5 ->
1 2 3 4
- Check if ECM recognizes the operating mode by observing Display field 4.
Idle mode (Closed Throttle Position)
As long as engine is idling, idle speed must be displayed
- Display: Idle
Deceleration mode
- Raise engine speed above 3000 RPM.
- Close Throttle abruptly.
As long as engine speed is above 1400 RPM; Deceleration must be displayed
- Display: Decel
NOTE: Idle speed will be recognized below 1400 RPM.
Partially Open Throttle mode
- Raise engine speed evenly.
As long as engine speed is raised evenly, Partially Open Throttle must be displayed
- Display: Part Throt
Enrichment mode
- Quickly increase engine speed.
Enrichment must be displayed briefly
- Display: Enrich
Full throttle mode (Wide Open Throttle)
- Completely depress accelerator pedal (onto Throttle stop).
Wide Open Throttle must be displayed briefly
- Display: Full Throt
NOTE: A test drive may be required to display "Full Throt."
Observe appropriate safety precautions during road test.
- Press -> button.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press 0 and 6 buttons to select "End output" function 06.
- Press Q button to enter input.
If specifications not obtained
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory.
- Check Throttle mechanism for ease of operation.
- Check Throttle Position sensor. Testing and Inspection
- Display the Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- If DTC memory was erased or if the ECM was disconnected from Battery + , set the Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes