Index des codes défaut · medium
P1549
IMT valve 1 (top) circuit malfunction
IMT valve 1 (top) circuit malfunction
Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): EMS EOBD, EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –IMT 1 Inhibited
Common causes
- IMT Valve 1 (top) disconnected IMT Valve 1 (top) to ECM drive circuit fault IMT Valve 1 (top) power supply circuit fault IMT Valve 1 (top) failure
- Intake Manifold Communication Control Module Malfunction
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Compare live sensor values vs expected (unplugged/biased sensors are common)
- Check intake boots, PCV, and vacuum lines for splits (very common on aged X-Types)