New Beetle L4-1.8L Turbo (AWP) (2003)
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If the resistance value is within the specified range:
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Check CAN-Bus wiring using Electrical Wiring Diagram.
With Generic Scan Tool
Terminal resistance for CAN-Bus, checking
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
-
VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements
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DTC "P0600 Serial Communication Link" was detected by the Engine Control Module (ECM), Diagnostic mode 3: Check DTC memory. See:
Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/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.
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Check the central termination resistor in the Engine Control Module (ECM):
-
To do this, measure resistance between test box socket 58 + 60:
Specified value: 60...72 ohms
If resistance value is not in expected range:
-
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).
