Lotus Evora - Variable Intake Manifold Circuit

Lotus Service Notes Section EMR
Page 63
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 ECU Pin ECU Connector
1 Ignition supply (fuse R8) - -
2 VIM control valve control L4 48 Way (Central)
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.
2009/02