Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying System Relay Control Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-A3 is stored if the power cable from the system relay is short-circuited to supply voltage or if there is an open-circuit in the circuit and the control module has interpreted it as a fault.

Substitute Value

None idle air trim adaptation.

Possible Source

Signal too high:

Short-circuit to supply voltage in the signal cable.
Faulty system relay.

Signal too low:

Open-circuit in the signal cable.
Faulty system relay.

Fault symptom[s]

Engine does not start.
Malfunction indicator lamp (MIL) lit.