Lotus Evora. Manual - part 34

 

 

Lotus Service Notes   

 

 

  Section EMR

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

 

 

Lotus Service Notes   

 

 

  Section EMR

Clutch position sensor circuit

P0806  Clutch position sensor circuit range/performance

P0807  Clutch position sensor circuit low

P0808  Clutch position sensor circuit high

Description

The clutch position sensor is used to identify the position of the clutch (engaged, disengaged or slipping).  This 

information is used to control features such as fuel cut during gear changes, cruise control deactivation and 

ensuring any torque increase requests from the ESP system only occur with the clutch engaged.

The ECM continuously monitors the clutch position sensor input for malfunctions.

Component connections

Connector      Description                ECU Pin      ECU Connector

A            Ground                  K3         48 Way (Right)

B            Clutch position sensor signal        B1         48 Way (Right)     

C            Reference voltage           F4         48 Way (Right)

P0806

Monitor: 

•  Continuous

Enable Criteria: 

•  Maximum and minimum clutch position measured over 15 gear changes

Disable Criteria: 

•  None

Malfunction Criteria:

•  Voltage difference between maximum and minimum of less than 2.101V

Potential failure modes:

•  Clutch sensor failure

•  Clutch pedal failure

Diagnostic Mask:

•  The service light will be illuminated for 30 seconds after engine start if the fault has been present for the

previous two trips.

P0807, P0808

Monitor: 

•  Continuous

Enable Criteria: 

•  None

Disable Criteria: 

•  None

Malfunction Criteria:

•  P0807 – Sensor voltage < 0.098V

•  P0808 – Sensor voltage > 4.790V

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Potential failure modes:

•  P0807 – Clutch sensor wiring open circuit or shorted to ground

•  P0808 – Clutch sensor ECU input circuit shorted to 5V or 12V

•  Clutch sensor failure

•  Clutch pedal failure

•  ECU input circuit failure

Diagnostic Mask:

•  The service light will be illuminated for 30 seconds after engine start if the fault has been present for the

previous two trips.

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Air intake control valve circuit

P1113    Air intake control valve circuit

Description:

The air cleaner is equipped with 2 inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). 

This system reduces intake noise and increases engine power.

When the engine is operating in the low-to-mid speed range, the ECM deactivates the Vacuum Solenoid Valve 

(VSV) and allows the AICV to close one of the air cleaner inlets. When the engine speed is greater than a 

specified value the ECM activates the VSV and the applied vacuum activates the AICV to open both of the air 

cleaner inlets.  

Component connections

Connector      Description              ECU Pin      ECU Connector

1            Ignition supply (fuse R8)      -          -

2            VSV control               B1         48 Way (Central)   

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  VSV open circuit or short to ground

•  VSV circuit short to ECU

Diagnostic Mask:

•  The service light will be illuminated for 30 seconds after engine start if the fault has been present for the

previous two trips.

 

2009/02