Checking for an open-circuit and oxidation

Check the cable between breakout box terminal #50(#4) and Engine control module (ECM) terminal #B56. Check for an open-circuit, see: Checking wiring and terminals. Permanent fault

Check the ground points and connectors for contact resistance and oxidation, see: Checking wiring and terminals. Permanent fault

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking communication with the engine control module (ECM)