Lotus Evora. Manual - part 36

 

 

Lotus Service Notes   

 

 

  Section EMR

Throttle Actuator Control System – Forced Limited Power

P2106  Throttle actuator control system – forced limited power

Description

If a problem is detected which could result in engine speed control difficulties, the ECU will limit throttle opening 

to a maximum of 15%.

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  Electronic throttle fault

Note: This code indicates action taken by the ECU, and will always be accompanied by another code which 

has caused this action.

Throttle Actuator Control Module Processor

P2107  Throttle actuator control module processor

Description

The ECU contains two processors dedicated to the throttle pedal and throttle valve potentiometers.

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  ECU internal fault

•  Incorrect ECU programming

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Throttle Actuator Control Module Performance

P2108  Throttle actuator control module performance

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  ECU internal failure

•  Short circuit to throttle actuator

Pedal Position Sensor 'D' Circuit Low

P2122  Pedal position sensor ‘D’ circuit low

Description

Two potentiometers are built into the throttle pedal unit in order to provide a throttle demand signal to the ECU.  

Note that the potentiometers operate on 5 volts.

Enable Criteria: 

•  None

Disable Criteria: 

•  None

Potential failure modes:

•  Signal short circuit (< 0.283 V)

•  Reference voltage open circuit

•  Reference voltage short to ground

•  Sensor failure

Notes: A maximum throttle opening of 15% may be imposed due to this single code.  In the case of multiple 

codes, a mechanically sprung 7% opening may be applied.

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Pedal Position Sensor 'D' Circuit High

P2123  Pedal position sensor ‘D’ circuit high

Enable Criteria: 

•  None

Disable Criteria: 

•  None

Potential failure modes:

•  Signal open circuit (> 4.487 V)

•  Reference voltage open circuit

•  Reference voltage short to ground

•  Sensor failure

Notes: A maximum throttle opening of 15% may be imposed due to this single code.  In the case of multiple 

codes, a mechanically sprung 7% opening may be applied.

Pedal Position Sensor 'E' Circuit Low

P2127  Pedal position sensor ‘E’ circuit low

Description

Two potentiometers are built into the throttle pedal unit in order to provide a throttle demand signal to the ECU.  

Note that the potentiometers operate on 5 volts.

Enable Criteria: 

•  None

Disable Criteria: 

•  None

Potential failure modes:

•  Signal short circuit (< 0.283 V)

•  Reference voltage open circuit

•  Reference voltage short to ground

•  Sensor failure

Notes: A maximum throttle opening of 15% may be imposed due to this single code.  In the case of multiple 

codes, a mechanically sprung 7% opening may be applied.

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Pedal Position Sensor 'E' Circuit High

P2128  Pedal position sensor ‘E’ circuit high

Enable Criteria: 

•  None

Disable Criteria: 

•  None

Potential failure modes:

•  Signal open circuit (> 4.487 V)

•  Reference voltage open circuit

•  Reference voltage short to ground

•  Sensor failure

Notes: A maximum throttle opening of 15% may be imposed due to this single code.  In the case of multiple 

codes, a mechanically sprung 7% opening may be applied.

Throttle Position Sensor 'A'/'B' Voltage Correlation

P2135  Throttle position sensor ‘A/B’ voltage correlation

Description

Two potentiometers are built into the throttle actuator unit in order to provide a throttle position signal to the 

ECU.  Two processors within the ECU compare the two output signals, which should match within a defined 

tolerance. Note that the potentiometers operate on 5 volts.

Enable Criteria: 

•  None

Disable Criteria: 

•  Throttle position greater than 60%

Potential failure modes:

•  TPS1 reading incorrectly

•  TPS2 reading incorrectly

Notes: A maximum throttle opening of 15% may be imposed.

2009/02