Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

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.