Lotus Evora. Manual - part 33

 

 

Lotus Service Notes   

 

 

  Section EMR

Fuel Pump Relay

P0628  Fuel Pump “A” Control Circuit Low Voltage

P0629  Fuel Pump “A” Control Circuit High Voltage

Description

The fuel system is of the non-return type.  The fuel pump is incorporated into the fuel tank module, which also 

contains the level sensor, fuel pressure regulator and vapour pressure sensor. The ECM controls the fuel pump 

operation via a relay, because of this the only fault diagnosis is of the fuel pump relay.

Component connections

Relay connector      Description                 ECU Pin    ECU Connector

1                 Rear ignition relay (fuse R7)     -        -

2                 Fuel pump relay control           H2       48 Way (Right) 

Monitor: 

•  Continuous

Enable Criteria: 

•  Ignition on

Disable Criteria: 

•  None

Potential failure modes:

•  P0628 fuel pump relay wiring open circuit or shorted to ground

•  P0628 fuse R7

•  P0629 fuel pump relay wiring shorted to 12V

•  Fuel pump relay failure

•  ECU output circuit failure

Diagnostic Mask:

•  The MIL will be illuminated immediately if a fault is present.

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

VIN Not Programmed or Incompatible – ECU/PCM

P0630  Vin not programmed or incompatible

Description

The ECM programming process includes the Vehicle Identification Number (VIN). If a new ECM has been fitted 

this operation is performed using the Lotus TechCentre tool.

Monitor: 

•  During start up

Enable Criteria:

•  Engine running (for up to 4 seconds)

Disable Criteria: 

•  None

Potential failure modes:

•  VIN not programmed

Diagnostic Mask:

•  The MIL will be illuminated if fault is present.

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Throttle Actuator Control Range/Performance

P0638  Throttle actuator control range/performance

Description

The single throttle butterfly valve mounted at the inlet to the intake plenum is operated by a stepper motor under 

the command of the engine ECU. The valve moves through a range of nearly 90° and should display 100% at 

full throttle and around 2% at idle.

Monitor: 

•  Continuous

Enable Criteria 1:  

•  Engine running

Disable Criteria 1: 

•  Electronic throttle fault P2135, P0122, P0122, P0222 or P0223 present

•  Throttle demand transient condition

Malfunction Criteria 1:  

•  TPS error > 3% for 7.5 secs

       

Enable Criteria 2:  

•  Ignition on

Disable Criteria 2: 

•  Electronic throttle fault P2135, P0122, P0122, P0222 or P0223 present

Malfunction Criteria 2:  

•  Throttle not able to find closed position during boot

Potential failure modes:

•  Blocked throttle body

•  Damage to throttle actuator

Diagnostic Mask:

•  The MIL will be illuminated if fault is present.

Notes: A mechanically sprung 7% throttle opening may be imposed.  

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Air Conditioning System

P0646  A/C Clutch Relay Control Circuit Low

P0647  A/C Clutch Relay Control Circuit High

Description

The ECM controls the A/C clutch relay in response to the A/C driver request and ECM control logic.

Component connections

Relay Connector      Description              ECU Pin    ECU Connector

1                Ignition supply (fuse R11)

2                AC clutch relay control         F2       48 Way (Right)     

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  P0646 – A/C compressor relay wiring open circuit or shorted to ground

•  P0646 – Fuse R11

•  P0647 – A/C compressor relay circuit shorted to 12V

•  A/C compressor relay failure

•  ECU output 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