GTI V6-2.8L (BDF) (2002)
Engine Control Module: Testing and Inspection
CAN-Bus, Checking
With Manufacturer's Scan Tool
CAN-Bus, Checking
Function
The Motronic Engine Control Module (ECM) -J220- communicates with other CAN-bus compatible control modules via a CAN-bus.
These CAN-bus-capable components are connected by a pair of twisted CAN-bus wires (CAN high and CAN low) and exchange information
(messages). Information missing from the CAN-bus is recognized as an error and stored.
The CAN-bus requires a matching resistor to function Diagnostic Trouble Code (DTC) free. This matching resistor is located in the Motronic Engine
Control Module (ECM) -J220-.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable
NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.
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VAG 1526 Hand multimeter or VAG 1715 multimeter
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VAG 1594 Adapter set
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VAG 1598/31 test box
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Electrical Wiring Diagrams
Test prerequisites
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The CAN-bus On Board Diagnostic (OBD) has detected a Diagnostic Trouble Code (DTC).
Test sequence
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Remove wiper arms and cowl panel:
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Connect VAG 1598/31 test box to Motronic Engine Control Module (ECM) -J220-. The control module wiring harness is not connected by this
action.
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Check centralized matching resistor in Motronic Engine Control Module (ECM) -J220-.
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To do this, check resistance between test box
Sockets 58 and 60.
Specification: 60 to 72 ohms
If the resistance measurement are not within the specified range:
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Replace Motronic Engine Control Module (ECM) -J220-.
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Check DTC memory, repair malfunctions if necessary and then erase DTC memory.
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
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Erase learned values and adapt Motronic Engine Control Module (ECM) -J220- again.
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Read readiness code. If the DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from battery
positive (B+), the readiness code must be generated again.
See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If the resistance value is within the specified range:
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Repair Diagnostic Trouble Code (DTC):
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Check DTC memory, repair malfunctions if necessary and then erase DTC memory.
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes