Solution to Insufficient Voltage in Scania Truck Auxiliary Heater System

This illustration show you the easy way to solve Scania truck auxiliary heater system ATA 111 insufficient voltage problem.

Error Identification: The error is identified as insufficient voltage, with the voltage dropping below 20 V.

Possible Causes:

Notes: The auxiliary heater was turned off due to low voltage reaching the control unit.

Actions to Take:

Check Voltage Supply:
- Measure voltage at points 1 and 9 in the connector from the auxiliary heater toward the vehicle cable harness.
- Compare the measured voltage with the battery voltage. They should not differ significantly.
If Voltage is Above 20 V:
- Renew the control unit.
If Voltage is Below 20 V:
- Check the voltage supply thoroughly.
- Inspect connectors and wiring for any damage or loose connections.
- Verify positive and negative connections.
- Clear the fault code.
Test Run:
- After addressing the voltage issue, clear the fault code.
- Test run the auxiliary heater and the vehicle to ensure that the problem has been resolved.

Additional Recommendations:

If the control unit needs replacement, ensure you use a compatible and functional unit.
Keep an eye on the overall health of the battery, as a weak battery could lead to voltage issues.
Regularly inspect the cable harness, connectors, and wiring for any signs of wear or damage.

For more information about Scania truck,please refer to: Scania Trouble Repair.