Applies to: EMD0EMD1
What does Scania EMD fault code 53504 mean?
The engine control unit does not receive a message from the coordinator.
What causes Scania DTC 53504?
Communication between the engine control unit and the coordinator is broken. If the fault code has only been generated once, this may be due to the voltage to the coordinator having been interrupted while the engine control unit has been supplied with voltage. If the fault code is generated frequently, this is probably due to a problem in the electrical cables or harness-to-harness connectors.
How does the system react?
The engine cannot be started as long as the fault is active. If the fault occurs when the engine is running, this will result in a limp home speed of 750 rpm.
How to fix Scania EMD fault code 53504?
- General troubleshooting: Clear the fault code memory and test start the engine.
- Switch the power off and on several times with the starter key.
- If the fault code recurs, check the electrical cables and clean the contactors.
- If this does not help, check that the control units receive 15 voltage off and on at the same time.
- If the above does not help, renew the coordinator.
- If this does not help, renew the engine control unit.
- Remember to check and clear fault codes in the coordinator.
This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.