Checking the power supply and ground for the engine control module (ECM)

Checking the power supply 

• Check the fuse for the engine control module (ECM) in the fusebox in the engine compartment. If the fuse is blown, check the circuit after the fuse. Check for a short-circuit to ground.
• Check the power supply to the engine control module (ECM). The voltage must be approximately battery voltage.

Checking the ground terminal 

• Check the ground leads between the engine control module (ECM) and the ground terminal. Check for an open-circuit
• Check the ground terminal for the engine control module (ECM). Check for contact resistance and oxidation.

Remedy as necessary

Other information 

• See Connecting the breakout box
• For 6 cylinder engines -2001, see Signal specification
• For 6 cylinder engines 2002-, see Signal specification
• For 6 cylinder engines -2004, see Signal specification
• For 6 cylinder engines 2005-, see Signal specification .
• Signal specification 5-cyl naturally aspirated engine: Signal specification
• Signal specification 5 cyl turbo charged engines: Signal specification

Fig 1: Breakout Box

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Engine Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Checking the engine control module (ECM) 

• NO 

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