Beetle L4-2.0L (AEG) (2000)
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Wiring diagram
Test requirements
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
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Battery voltage must be at least 11.5 volts.
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Speedometer -G21- must be OK.
Test sequence
NOTE: To test speed signal, vehicle must be driven. Doing this requires a second person.
WARNING: Secure Scan Tool (ST) on the rear seat and have operated from there by second technician.
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Connect diagnostic tester. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Diagnostic Tester, Connecting
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Start engine and let run at idle.
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Under address word 33, select "Diagnostic mode 1: Checking measured values."
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Select the measuring value "PID 13: Vehicle speed".
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Perform a road test, while a 2nd person observes the indication on the display.
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Check specified value of the vehicle speed:
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End diagnosis and switch ignition off.
If no speed is indicated:
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Connect test box to control module wiring harness, connect test box for wiring test. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box,
Connecting For Wiring Test
Vehicles with engine code AEG
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To measure voltage, connect multimeter between sockets 2 (Ground -GND-) + 20 (speed signal) of test box.
Vehicles with engine code AVH, AZG, BDC
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To measure voltage, connect multimeter between sockets 2 (Ground -GND-) +54 (speed signal) of test box.
Continuation for all vehicles
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Raise vehicle at front left.
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Switch ignition on.
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Rotate front wheel, and observe voltage indicated while doing so. Specified value: 0.0 to at least 4.0 V, fluctuating
NOTE: The right front wheel must not turn during this, hold it steady if necessary.