Variable Intake Manifold Circuit - Lotus Evora Service Notes

Lotus Service Notes

Variable intake manifold circuit

P0661 Variable intake manifold circuit voltage low
P0662 Variable intake manifold circuit voltage high
Description
This circuit opens and closes the variable intake manifold (VIM) in response to changes in the engine speed
and load in order to increase the intake efficiency.
When the engine speed is less than 4200 rpm and the engine load is greater than 52%, the ECM turns on the
VIM control valve to close the VIM. Under all other conditions, the VIM control valve is usually off and the VIM
is open.
Component connections
Connector Description
1 Ignition supply (fuse R8)
2 VIM control valve control
Monitor:
• Continuous
Enable Criteria:
• Engine running
Disable Criteria:
• None
Potential failure modes:
• P0661 – VIM wiring open circuit or shorted to ground
• P0661 – Fuse R8
• P0662 – VIM circuit, ECM side, shorted to battery voltage
• VIM control valve failure
• ECU output circuit failure
Diagnostic Mask:
• The MIL will be illuminated if a fault is present for two consecutive trips.
ECU Pin
-
L4
2009/02
Section EMR
ECU Connector
-
48 Way (Central)
Page 63