Checking communication, continued

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 Checking wiring and terminals

Fig 1: Identifying Connector Terminals

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• Continue 

  Refer to Verification