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

Checking power supply terminal

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 11B/14. 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 the ground lead between the engine control module (ECM) #62, #A53, #A54 and the ground terminal 31/96 on the right side member for an open-circuit according to Open-circuit, permanent faults
Check the 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 #A62.
For information about the location of the ground terminal, see Location of components .
For information about other signals, see Signal specification .
For further information about the circuit, see the relevant wiring diagram.

Fig 1: Identifying Voltmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Are the power supply and ground terminals OK?