Scania COO DTC 9 Signals from the starter lock

Applies to: COO6 (COO6C)

What does Scania COO fault code 9 mean?

Inadmissible combination of signals to the coordinator from the starter lock. The fault code is generated when the coordinator receives a signal indicating that the voltage is turned on, but there is no signal that there is a starter key in the starter lock.

What causes Scania DTC 9?

Fault in the starter lock circuit or internal fault in the starter lock.

How does the system react?

The engine cannot be started as long as the fault is active.

How to fix Scania COO fault code 9?

1. Check the starter lock including wiring and harness-to-harness connectors.
2. Measure the voltage on the "starter key inserted" coordinator pin When the starter key is in the lock, the voltage should correspond to the battery voltage, i.e.
3. 24 V.
4. When the key is removed, the voltage should be 0 V.