Checking components and wiring

Check central electronic module (CEM) connector terminal C and engine control module (ECM) connector B. Check for contact resistance. Check for oxidation. Check for damage. Check for loose connections. Also check the intermediate connectors.

Check the signal cable. Check for a short-circuit to ground.

Take readings between:

• Central electronic module (CEM) terminal #C15 (#15) and engine control module (ECM) terminal #B27.

Remedy as necessary.

Other information 

• See Connecting the breakout box
• -2004: Signal specification
• 2005-: Signal specification
• See Central electronic module (CEM), replacing
• See Engine control module (ECM), replacing
• See Checking wiring and terminals

Fig 2: Identifying Connector C

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification