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-AF is stored if the control module detects that the signal from the leak diagnostic pump is too high, too low or missing.
Substitute Value
- No leak diagnostic
- No EVAP diagnostics.
Possible Source
Signal too high:
- Short-circuit to supply voltage in the signal cable
- Defective leak diagnostic pump.
Signal too low:
- Short-circuit to ground in the signal cable
- Short-circuit to ground in the power cable
- Defective leak diagnostic pump.
Signal missing:
- Open-circuit in the signal cable
- Open-circuit in the power cable
- Contact resistance in the terminals
- Defective leak diagnostic pump.
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.