The RA system heating components are controlled by the ECU. This does not apply to the main RA tank heat-
er. MTU recommends permanently heating the RA tank if temperatures below -5 °C can be expected.
The component parts of the heating system, including the temperature sensors, are tested for open load and
short circuit when activated as soon as the ECU is powered-up and is ready for operation prior to engine
start-up.
Any malfunction occurring in the heating system which disables the RA dosing system when the engine is
running is handled like a component failure or tampering event. This leads to a final alarm after 4 hours (or
30 minutes in the case of a second or third occurrence).
MS15065/01E 2019-01
| RA Dosing System | 89
TIM-ID: 0000072460 - 001
