Monitor Description
The ECM monitors the idling speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if the following conditions are met:
- The learned idling air flow volume remains at the maximum or minimum volume for 5 seconds during a drive cycle.
- After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the actual engine idling speed minus the target idling speed is less than -100 rpm or 150 rpm or more when the A/C and NSW are off, or less than -100 rpm or 200 rpm or more when the A/C or NSW is on 5 times or more during a driving cycle.