P050D

P050D

Diagnosis information - DME (DFI)

Idle speed control

NOTE: The fault [Idle speed control] is detected when the DME control unit cannot set the specified idle speed for a certain amount of time.

Diagnostic conditions
- Cold start (catalytic converter heating phase)
- Engine idling more than 20 s
- Vehicle not moving
- Engine not loaded
- Engine temperature more than -10 °C (14 °F)
- No tank ventilation or tank ventilation diagnosis
- No secondary air diagnosis
- Altitude correction factor more than 0.75 (altitude below 2,450 m)
- No fault for speed signal, throttle potentiometer, engine temperature, intake air temperature, tank vent or tank ventilation system

Possible fault causes
- Poor fuel quality
- Air cleaner blocked/frozen
- Air guide between air cleaner and throttle valve blocked
- Secondary unit sluggish
- Exhaust system blocked