How to Convert Scania Variable Water Pump to Fixed Manual Type – Step-by-Step Guide

This procedure explains how to disable the new variable/clutched water pump function in the ECU and configure the system for a fixed, manual water pump without clutch by editing the SOPS/parameters and then performing spare part programming of the EMS. This is useful when replacing a variable water pump assembly with a simpler mechanical pump and you want the EMS to stop monitoring or controlling the clutch function.

Step-by-step water pump parameter change

1. Launch SDP3 in Conversion Mode
   Open SDP3 and switch to Conversion mode from the main menu to work with vehicle configuration files.
2. Save the Current SOPS File
   In the top-left corner, select File → Save SOPS File and save the current configuration to your computer as a backup.
3. Open the SOPS File in Scania SOPS Editor
   Start Scania SOPS Editor, click Open SOPS File, and load the SOPS file exported from SDP3.
4. Go to the SOPS Tab
   Once loaded, open the SOPS Tab to access all editable parameters for the vehicle.
5. Search for the Water Pump Parameter
   In the search bar, type “water pump” or “New Water Pump variable/clutch” to quickly locate the relevant parameter.
6. Change “New Water Pump variable/clutch” to “Without”
   When you find the parameter “New Water Pump variable/clutch”, change its value from the current setting to “Without”. This tells the EMS that the engine is no longer equipped with a variable or clutched water pump and should behave as if a fixed mechanical pump is installed.
7. Save the Modified SOPS File
   Click Save Modified SOPS to store the new configuration with the updated water pump parameter.
8. Load the Modified SOPS Back into SDP3
   Return to SDP3, go again to the Conversion tab, and select the modified SOPS file you just saved.
9. Program the Vehicle Configuration
   SDP3 will automatically start programming the vehicle with the updated SOPS data. Wait for the programming process to complete successfully without errors.
10. Return to the Main Menu
    After programming, SDP3 will close the conversion job and return to the main screen, indicating that the configuration has been applied.

EMS spare part / replacement programming

11. Open Checks and Adjustments / Replacement Functions
    In SDP3, go to the normal Checks and Adjustments or Replacement / Spare part programming section related to the EMS.
12. Perform EMS Replacement / Spare Part Programming
    Run the procedure for EMS spare part programming so the control unit learns and stores the new configuration (without variable/clutched water pump). This step is important to avoid fault codes linked to missing clutch control or position feedback.
13. Verify for Fault Codes and Cooling Operation
    After programming, read out fault codes in EMS and ensure there are no active errors related to the water pump clutch or variable control. Check that the engine reaches and maintains normal operating temperature with the new fixed manual pump installed.

Note on hardware changes

When replacing the variable/clutched water pump with a manual fixed pump without clutch, ensure the new pump and any associated hoses or brackets are correctly installed according to engine type. Any old electrical connectors or clutch wiring that are no longer used should be secured safely and insulated to avoid shorts, while the EMS configuration handles the rest through the changed parameter.