Variant 1
Applies to: ATA1
What does Scania ATA fault code 111 mean?
The voltage has been too low. Below 20 V.
What causes Scania DTC 111?
Fault in cable harness, battery or control unit.
How does the system react?
The auxiliary heater was switched off because the voltage to the control unit was too low.
How to fix Scania ATA fault code 111?
- Check the voltage supply.
- Measuring points 1 and 9 in the connector from the auxiliary heater toward the vehicle cable harness.
- The measurement should not be different from the voltage value from the battery.
- If the voltage is above 20 V, renew the control unit.
- If the voltage is below 20 V, check the voltage supply.
- Check connectors and wiring.
- Check the positive and negative connections.
- Clear the fault code and test run the auxiliary heater and vehicle.
Variant 2
Applies to: ATA2
Detection
The voltage has been too low. Below 20 V.
Possible cause
Fault in cable harness, battery or control unit.
System reaction
The auxiliary heater was switched off because the voltage to the control unit was too low.
How to fix
- Check the voltage supply.
- Measuring points 1 and 9 in the harness-to-harness connector from the auxiliary heater toward the vehicle cable harness.
- The measurement should not be different from the voltage value from the battery.
- If the voltage is above 20 V, renew the control unit.
- If the voltage is below 20 V, check the voltage supply.
- Check harness-to-harness connectors and wiring.
- Check the positive and negative connections.
- Clear the fault code and test run the auxiliary heater and vehicle.
This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.