Lotus Eleven/Elise/Exige. Manual - part 46

 

 

Lotus Service Notes   

 

 

  Section EMP

Page 39

Air Conditioning System          P0646

                          P0647

P0646  A/C Clutch Relay Control Circuit Low

P0647  A/C Clutch Relay Control Circuit High

Component connections

Connector      Description        ECU Pin    ECU Connector

5 (ACCM 2*)    AC Clutch Relay    53 (J1)    28 Way (Left)    

'06 M.Y. in brackets

*ACCM – A/C Control Module

Monitor: Continuous

Enable Criteria: Engine running

Disable Criteria: None

Potential failure modes:

•  A/C compressor clutch open circuit or short to ground

•  A/C Control Module failure

•  A/C compressor clutch failure

•  ECU output circuit failure

Notes:

No MIL will be illuminated for this failure.

Page 40

 

 

Lotus Service Notes   

 

 

  Section EMP

Misfire                      P1301

                          P1302

P1301  Misfire level causing emissions increase

P1302  Misfire level causing catalyst system damage

Description

When the engine misfire reaches a high enough percentage the engine emission output levels can exceed the 

allowed limits, this will produce the fault code P1301. If the misfire percentage is high enough and there is a 

possibility that the catalyst may be damaged then code P1302 will be set.

See misfire faults P0300, P0301, P0302, P0303, P0304

Notes:

•  The MIL will flash for a 1302 fault code

•  The MIL will be illuminated if the 1301 fault is present for 2 consecutive trips.

 

 

Lotus Service Notes   

 

 

  Section EMP

Page 41

Coolant Recirculation Pump        P2602

                          P2603

P2602  Coolant Pump Control Circuit Low

P2603  Coolant Pump Control Circuit High

Description

During a hot shutdown of the engine, the recirculation pump can continue to pump coolant around the engine.  

The recirculation pump will run after the engine has been turned off if the enable criteria are matched.

Component connections

Connector          Description        ECU Pin    ECU Connector

2 (RMC 1 – MFRU*)    Fuse box        -        -

5 (RMC 2 – MFRU*)    Recirc Pump Relay  69 (K1)    28 Way (Left)  

'06 M.Y. in brackets

*MFRU – Multi Function Relay Unit

Monitor: Continuous

Enable Criteria: 

P2602 - engine not running

P2603 - engine running

Disable Criteria: None

Potential failure modes:

•  Pump open circuit or short to ground

•  Multi Function Relay Unit failure

•  Pump failure

•  ECU output circuit failure

Notes:

No MIL will be illuminated for this failure.

Page 42

 

 

Lotus Service Notes   

 

 

  Section EMP

Camshaft Lift Control (VVL)        P2646

                          P2647

                          P2648

                          P2649

P2646  A Rocker Arm Actuator System Performance or Stuck Off

P2647  A Rocker Arm Actuator System Stuck On

P2648  A Rocker Arm Actuator Control Circuit Low

P2649  A Rocker Arm Actuator Control Circuit High

Description

Intake and exhaust camshaft lift can be changed by means of the Variable Valve Lift (VVL) system, which varies 

the amount of maximum lift of the intake and exhaust valves.  The mechanism uses dual element rocker arms to 

provide cam changeover, with both the intake and exhaust camshafts having high and low speed cam profiles.  

The system is ECU controlled, using an oil control solenoid which, when activated, uses hydraulic pressure to 

push a rocker arm locking pin into engagement to activate the high-speed cam profile.  A signal from the VVL 

oil pressure switch provides feedback to the ECU that VVL activation has taken place. VVL activation* to the

high lift camshaft profile occurs at 6200rpm when engine speed is increasing, and returns to the low lift camshaft 

profile at 6000rpm when the engine speed is decreasing.

*Coolant temperature must be >60°C (140°F).

Component connections

Connector    Description            ECU Pin      ECU Connector

1          Battery Voltage         -          -

2          VVL Oil Control Valve     12 (H3)      52 Way (Right)

                                                   

'06 M.Y. in brackets

-          VVL Oil Pressure Switch    21 (B2)      52 Way (Right)

Monitor: Continuous

Enable Criteria: Engine running

Disable Criteria: None

Potential failure modes:

•  VVL valve stuck open / closed

•  VVL valve open circuit

•  VVL valve short to ground

•  Rocker arm failure

•  Rocker shaft location pin failure

•  ECU output circuit failure

Notes:

The MIL will be illuminated if the fault is present for 2 consecutive trips.