Beetle L4-2.0L (AEG) (2000)
Component Tests and General Diagnostics
Checking Terminal Resistance For CAN Bus (Vehicles With Engine Code AVH, AZG, BDC)
Function
The Engine Control Module (ECM) communicates with all databus-capable control modules via a CAN-Bus.
These databus-capable control modules are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange
information (messages). Missing information on the CAN-Bus is recognized as a malfunction and stored.
Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistor is located in the Engine Control Module
(ECM).
Recommended special tools and equipment
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test requirements
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DTC "P0600 Data Bus Powertrain missing message" was detected by the Engine Control Module (ECM), Diagnostic mode 3: Check DTC
memory.
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Ignition switched off.
Test sequence
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Connect test box to Engine Control Module (ECM), connect test box for wiring test. During this, wiring harness to Engine Control Module (ECM)
is not connected. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan
Tool/Test Box, Connecting For Wiring Test
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Check the central termination resistor in the Engine Control Module (ECM).
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To do this, measure resistance between test box socket 58 + 60: Specified value: 60...72 Ohms
If resistance value is not in expected range:
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Replace Motronic Engine Control Module (ECM) -J220-.
If resistance value is in expected range:
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Disconnect test box from Engine Control Module (ECM).
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Connect test box to control module wiring harness.
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Check CAN data bus wires for short circuit to each other:
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To do this, perform a resistance measurement between test box sockets 58 + 60: Specified value: Infinite Ohms
If specified value is obtained (wires have no shorts):
-
Eliminate error in wires (see wiring diagram).
End Output (Function 06)
End Output (function 06)
-
Press buttons -0- and -6- to select function "End output."
Indicated on display:
Rapid data transfer
Q
06 - End output
-
Press -Q- button to confirm input.
Indicated on display:
Rapid data transfer
HELP
Enter address word XX
-
Switch off ignition.