The Scania 4-series lacks a coordinator and traditionally uses VCI1 to connect to the vehicle for running SD2/SP2 software. However, to read real-time engine data (e.g., with XCOM), you must connect to the CAN bus using VCI2. This requires a custom VCI cable and a software configuration to communicate with the Engine Control Unit (ECU).
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Requirements
Hardware
Standard CAN connector (Scania P/N 1349719)
Four cables (approximately 40 cm each)
Two alligator clips
Standard VCI connector
Software
XCOM diagnostic tool
Steps to Configure
Build the Custom VCI Cable
Connect the wires as follows:
Pin 16 → Red alligator clip (power source)
Pin 4 → Black alligator clip (ground)
Pins 6 and 14 → CAN connector (for CAN High and CAN Low)
Set XCOM Tester Address and Search Mode
Open XCOM and navigate to the Options menu.
Modify the following settings:
Tester Address: Set to “F9.”
Search Mode: Change to “S6 PRESAMM (Physical request ECU 0x00).”
Confirm the warning message by selecting OK.
Save changes and restart XCOM.
Note: These changes will configure XCOM (and compatible tools like SDP3, Gadget, CDev, and DMecNet) to exclusively scan for the EMS on the CAN bus. No other ECUs will be detected.
Connect the VCI Setup to the Vehicle
Attach the “homemade” VCI cable to the vehicle’s connection port located under the fuse box.
Plug the VCI2 into the custom VCI cable.
Start Diagnostics
Launch XCOM. It should now be ready to connect to the ECU (EMS) via the CAN bus.
Restore XCOM Settings
Once diagnostics are complete, revert the changes made in Step 2:
Reset the Tester Address back to “F9” (default) or the previously used address.
Restore the Search Mode to its default setting.
Save changes and restart XCOM.
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