Checking communication

Check whether the communication is working. Read off the combustion preheater module (CPM) P/N in the VIDA communication input for example.

Test whether the fault is only limited to the combustion preheater module (CPM) or if there are communication faults with other nodes as well. The fault has been localized if the only problem is in establishing contact with the combustion preheater module (CPM).

If the communication works and the P/N can be read off, the fault is intermittent.

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  Refer to Checking communication 

Check the cable between combustion preheater module (CPM) terminal #6 and central electronic module (CEM) terminal #C32. Check for a short-circuit to ground. Check for loose connections.

HINT: All communication between the combustion preheater module (CPM) and the central electronic module (CEM) is via this cable. 

Also check the connectors.

Remedy as necessary.

Other information 

• See Connecting the breakout box
• Combustion preheater module (CPM): Signal specification
• Central electronic module (CEM): Signal specification
• See Contents

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  Refer to Verification