Checking engine control module (ECM) power supply and ground terminal

Checking power supply

Check fuse 11 B/18. If the fuse is blown check the circuit after the fuse for a short-circuit to ground according to Short-circuit to ground, permanent faults
Check fuse 11/B14. If the fuse is blown check the circuit after the fuse for a short-circuit to ground according to Short-circuit to ground, permanent faults .
Check power supply to #A70. Voltage should be approximately battery voltage.
Check power supply to #B11. Voltage should be approximately battery voltage.

Checking ground terminal

Check ground lead between engine control module (ECM) #A53, #A54, #A63 and right side member ground terminal 31/96 for an open-circuit according to Open-circuit, permanent faults
Check engine control module (ECM) ground terminal for contact resistance and oxidation according to Contact resistance and oxidation

Remedy as necessary

Other information

To connect the breakout box, see Connecting the breakout box
Power supply to the engine control module (ECM) #A70 is from fuse 11 B/18 via the system relay.
Power supply to engine control module (ECM) #B11 is from fuse 11 B/14 via terminal 30+.
The engine control module (ECM) ground terminal is common to engine control module (ECM) terminals #A53, #A54 and #A63.
For further information about the location of ground terminals on the B52X4 T, see Location of components . For 6 cylinder engines, see:
- 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 signals on 5-cyl engines, see Signal specification .
For information about signals on 6-cyl engines:
- 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 .
For information about circuit see the relevant wiring diagram

Fig 1: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

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