Idle Speed Control - Lotus Evora Service Notes

Lotus Service Notes

Idle Speed Control

P0506 Idle Air Control System RPM Lower Than Expected
P0507 Idle Air Control System RPM Higher Than Expected
Description
The ECM controls the engine idle speed using a combination of spark advance and throttle blade adjustment.
If this control cannot attain the desired idle speed a fault is diagnosed.
Monitor:
• Continuous
Enable Criteria:
• Engine at idle speed
• Battery voltage between 10 V and 16 V
Malfunction Criteria 1:
• Idle air learn value on upper limit of +1.8g/s
• Idle speed more than 200 rpm above desired idle speed for more than 5 seconds.
Malfunction Criteria 2:
• Idle air learn value on lower limit of -1.8g/s
• Idle speed more than 100 rpm below desired idle speed for more than 5 seconds.
Potential failure modes:
• Induction system air leak
• Excessive engine load from front end accessory drive system, water pump, power steering, alternator
• Electronic Throttle Control
Diagnostic Mask:
• The MIL will be illuminated if a fault is present for 2 consecutive trips.
Notes:
There will be a different learn value for AC on and AC off. Either could trigger fault
2009/02
Section EMR
Page 51