Diagnostic trouble code (DTC) information

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

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.