Lotus Evora - Idle Speed Control

Lotus Service Notes Section EMR
Page 51
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