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 control module registers a supply voltage from the system relay for more than 2 seconds with the ignition on and the engine not running (signal too high) or that the signal from the power supply cable for the system relay is too low (signal too low).

Substitute Value

None.

Possible Source

Signal too high:

Short-circuit to supply voltage in the power cable
Defective system relay.

Signal too low:

Open-circuit in the power cable
Defective system relay.

Fault symptom[s]

The engine fails to start
Malfunction indicator lamp (MIL) lit.