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

Checking power supply

Check fuse 11 B/3. 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/1. 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 31/71 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

Connecting the breakout box/accessing the control module, see Connecting the breakout box .
Power supply to the engine control module (ECM) #A70 is from fuse 11 B/3 via the system relay.
Power supply to engine control module (ECM) #B11 is from fuse 11 B/1 via terminal 30+.
The engine control module (ECM) ground terminal is common to engine control module (ECM) terminals #A53, #A54 and #A63.
Location of components see Component location, B52X4 T .
For information about signals, see Signal specification .
For information about circuit see the relevant wiring diagram

Fig 1: Identifying Voltmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected?