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

Diagnostic trouble code (DTC) ECM-7D is stored if the control signal cable to the air conditioning (A/C) relay has a short-circuit to ground, short-circuit to supply voltage or an open-circuit.

Substitute Value

None.

Possible Source

Signal too high:

Short-circuit to supply voltage in the signal cable.
Faulty air conditioning (A/C) relay.

Signal too low:

Short-circuit to ground in the signal cable.
Open-circuit in the signal cable.
Faulty air conditioning (A/C) relay.

Fault symptom[s]

The air conditioning (A/C) compressor does not function.
Air conditioning (A/C) compressor operates constantly.