Faulty Signal

ECM-901A ENGINE CONTROL MODULE (ECM) COMMUNICATION
FAULTY SIGNAL

Reading of DTC status ECM-901A



Note! When Reading the DTC status, other stored diagnostic trouble codes (DTCs) and their status will be listed.

- Read the DTC status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent?
Yes - Skip to "Other Diagnostic Trouble Codes (DTCs)"
No - Continue below.


Fault-tracing information
Engine control module (ECM) registered a communication fault previously but has detected that the fault is no longer present.


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
--Testing Complete--


Other Diagnostic Trouble Codes (DTCs)



Note! The role of the combined instrument panel is the overall control of the communication network and a number of DTCs which indicate the fault. In the event of communication problems the fault may exist in another part of the communications network.

- Ignition on.
Read diagnostic trouble codes (DTCs) from the combined instrument panel.

If there are diagnostic trouble codes (DTC) stored in the combined instrument panel, fault trace accordingly.

Are any diagnostic trouble codes (DTC) stored in the combined instrument panel?
Yes - Testing Complete.
No - Continue below.


Replacing Control Module and Programming



- The control module has registered an internal fault.

Caution! A new control module is delivered without software. The control module must be programmed in order to function after replacement.

For further information about programming and replacing the control module, Engine Control Module (ECM), Replacing


Fault-tracing information
Fault-tracing is not followed by verification for this fault.