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 -2004, see SIGNAL SPECIFICATION
• For 6 cylinder engines 2005-, see SIGNAL SPECIFICATION .
• Signal specification 5-cyl naturally aspirated engine: SIGNAL SPECIFICATION
• For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
• For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .

Fig 1: Breakout Box

Courtesy of VOLVO CARS CORPORATION

Fig 2: Engine Control Module

Courtesy of VOLVO CARS CORPORATION

Was a fault detected? 

• YES 

  Refer to CHECKING THE ENGINE CONTROL MODULE (ECM) 

• NO 

  Refer to CHECKING COMMUNICATION WITH THE ENGINE CONTROL MODULE (ECM)