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 according to: Checking wiring and terminals. Permanent fault

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

HINT: For information about terminal numbers and cable routing, see signal description and corresponding wiring diagram. 

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

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