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

To connect the breakout box, see Connecting the breakout box
For information about the location of ground terminal for B52X4 S/S2, see Location of components . For information about the location of ground terminal for B52X4T see Location of components . For information about the location of ground terminal for B6304S:
- For 6 cylinder naturally aspirated engines -2001, see Location of components
- For 6 cylinder naturally aspirated engines 2002, see Location of components, engine compartment
- For 6 cylinder naturally aspirated engines 2003-, see Location of components, engine compartment .
. For information about the location of ground terminal for B6284T:
- For 6 cylinder turbocharged engines -2001, see Location of components
- For 6 cylinder turbocharged engines 2002, see Location of components, engine compartment
- For 6 cylinder turbocharged engines 2003-, see Location of components, engine compartment .
.
For information about signals on 5-cylinder naturally aspirated engines, see Signal specification
For information about signals on 5-cylinder turbocharged engines, see Signal specification
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 .

Fig 1: Breakout Box

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Engine Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

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