Beetle L4-2.0L (AEG) (2000)
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Engine Control Module: Testing and Inspection
Engine Operating Modes
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
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VAG 1551/1552 Scan Tool using VAG 1551/3 Adaptor cable
Requirements
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Throttle cable adjustment must be OK See 'Fuel Delivery and Air Induction, Throttle Cable/Linkage, Adjustments.' See: Fuel Delivery and Air
Induction/Throttle Cable/Linkage/Adjustments
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Engine Coolant Temperature 85 °C minimum
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Display group 04, Display zone 3.
Test sequence
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Connect VAG 1551/1552 Scan Tool See 'Testing and Inspection, Procedures, Connection and Use of Test Equipment.' See: Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures
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Start engine and let idle
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Press 0 and 1 buttons to select Address word 01: "Engine electronics"
Display will appear as shown (example only)
06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000
WSC 00000
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Press -> button.
Display will appear as shown
Rapid data transfer
HELP
Select function XX
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Press 0 and 8 buttons to select Function 08: "Read measuring value block"
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Press Q button to enter input.
Display will appear as shown
Read measuring value block
Input Display group number XXX
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Press 0, 0 and 5 buttons to select "Display group 5"
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Press Q button to enter input.
Display will appear as shown (1 to 4 = Display zones)
Read measuring value block 5
->
1
2
3
4
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Check it ECM recognizes the operating mode by observing Display zone 4
Idle mode (Closed Throttle Position)
As long as engine is idling, idle speed must be displayed
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Display: Idle
Deceleration mode
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Raise engine speed above 3000 RPM.
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Close Throttle abruptly.
As long as engine speed is above 1400 RPM; Deceleration must be displayed
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Display: Decel
NOTE: Idle speed will be recognized below 1400 RPM.
