Eurovan V6-2.8L (AXK) (2001)
Function
The Engine Control Module (ECM) communicates with other CAN-bus capable control modules.
The 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 malfunction by both the Engine Control Module (ECM) and 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 resistor is located in the Engine Control Module
(ECM).
Test requirement
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A CAN-bus malfunction was recognized via On Board Diagnostic (OBD)
Special tools and equipment
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VAG1598/31 test box
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test sequence
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Switch ignition off.
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Disengage connector from Engine Control Module (ECM) and then disconnect it.
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Connect VAG1598/31 test box to Engine Control Module (ECM). Control module wiring harness is not connected.
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Check the central termination resistor in the Engine Control Module (ECM):
-
Measure resistance between test box sockets 58 and 60: Specification 60 to 72 Ohms
If resistance value is not in expected range:
-
Replace Engine Control Module (ECM).
If resistance value is in expected range:
-
Repair malfunction:
Reading
Read Measuring Value Block (function 08)
The measuring value block is divided into 3 display groups, each containing 4 display fields.
Use this function to observe various "Gateway" cluster inputs.
-
Input address word 17 "Instrument cluster" and then press -> button until "Select function XX" is shown in display.
Indicated on display:
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select function 08 "Read measuring value block".
Indicated on display:
Rapid data transfer
Q
08 - Read Measuring Value Block
-
Press -Q- button to confirm input.
Indicated on display:
Read measuring value block
Q
Enter display group number XXX
-
Using the Scan Tool (ST) button pad, enter the required display group number (following example shows display group 001).