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-8D is stored if the idling speed is too high or too low when the throttle position (TP) sensor is in the closed position.
Substitute Value
- No fuel trim adaptation
- Limited EVAP control
- The conditions for fuel shut-off are changed.
Possible Source
Signal too low:
- The idle air control (IAC) valve sticks in the closed position
- Blocked hoses
- Contact resistance.
Signal too high:
- The idle air control (IAC) valve sticks in the open position
- Defective throttle position (TP) sensor
- Air leakage in the intake system.
Fault symptom[s]
- Low idling speed
- High idling speed.