New Beetle L5-2.5L (BPR) (2007)
/Page-1134001.png)
Information Bus: Component Tests and General Diagnostics
CAN Bus Terminal Resistance, Checking
Diagnostic Procedures
CAN Bus Terminal Resistance, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirement
‹› A CAN-Bus malfunction was recognized.
‹› The Engine Control Module (ECM) ( J220) fuses OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground connections between engine/transmission/chassis OK.
‹› Ignition switched OFF.
Function
The Engine Control Module (ECM) (J220) communicates with other CAN-Bus capable control modules.
The control modules are connected by 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 by the Engine Control Module (ECM) (J220) and the other control
modules connected to the CAN bus.
Trouble-free operation of the CAN Bus requires that it have a Terminal Resistance. This central Terminal Resistance is located in the Engine Control
Module (ECM) (J220).
Test Procedure
-
Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check.
‹› The Engine Control Module (ECM) (J220) must remain connected for the following test.
-
Remove the air cleaner assembly.
-
Disconnect the ABS Control Module (J104) electrical harness connector.
-
Using a multimeter, check the ABS Control Module (J104) electrical harness connector terminals 11 to 15 for the correct Terminal Resistance.
Specified value: 57 to 62 ohms (at approx. 20° C)
If the specified value was Not obtained:
Checking wiring
If the manufacturers test box is being used, perform the following step.
