Lotus Evora. Instruction - part 21

 

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Lotus Evora. Instruction - part 21

 

 

 

 

Lotus Service Notes   

 

 

  Section EMR

EMR.4 - DIAGNOSTIC GUIDE

Camshaft Timing Control (VVT)

P0011   Camshaft Position – Inlet Timing Over-Advanced or System Performance (Bank 1)

P0012   Camshaft Position – Inlet Timing Over-Retarded (Bank 1)

P0014     Camshaft Position – Exhaust Timing Over-Advanced or System Performance (Bank 1)

P0015     Camshaft Position – Exhaust Timing Over Retarded (Bank 1)

P0021     Camshaft Position – Inlet Timing Over-Advanced or System Performance (Bank 2)

P0022     Camshaft Position – Inlet Timing Over-Retarded (Bank 2)

P0024     Camshaft Position – Exhaust Timing Over-Advanced or System Performance (Bank 2)

P0025     Camshaft Position – Exhaust Timing Over-Retarded (Bank 2)

Description

The Variable Valve Timing system (VVT) on the intake camshafts and the exhaust camshafts can vary the 

timing by approximately 35°.  The camshaft relative position is varied by a system of vanes mounted on the 

drive end of the camshaft.  Each VVT oil control valve modulates a spool valve position in accordance with the 

drive signal duty cycle, this in turns controls the oil pressure applied to the vanes.  A 50% duty cycle applied to 

the valve will hold the valve current timing by preventing oil flow from the VVT controller housing, a duty cycle 

less than 50% will retard the valve timing, a duty cycle greater then 50% will advance the valve timing.  The 

ECM regulates this duty cycle based on the feedback signal from the respective camshaft position sensor to 

optimise the camshaft timing.

Component connections

Sensor Connector    Description                               ECU Pin    ECU Connector

1              Battery Voltage                                 -        -

2              VVT Control Valve Inlet (Bank 1)          B2            48 Way (Centre) 

1              Battery Voltage                                 -        -

2              VVT Control Valve Exhaust (Bank 1)       A2            48 Way (Centre)

1              Battery Voltage                 -     

2                                 VVT Control Valve Inlet (Bank 2)              A3            48 Way (Centre)

1              Battery Voltage                 -     

2                                 VVT Control Valve Exhaust (Bank 2)        A4            48 Way (Centre)

Monitor: 

•  Continuous

Enable Criteria:

•  Engine running > 30 secs

•  Coolant temperature > 60°C (140°F)

Disable Criteria:

•  P0116, P0117, P0118 – Coolant temperature fault codes

Malfunction Criteria:

•  VVT error > 5 degrees for time > 2.5 secs

Potential failure modes:

•  Static valve timing is incorrect

•  VVT camshaft actuator failure

•  VVT control valve stuck open / closed

•  VVT control valve filter

Diagnostic Mask:

•  The MIL will be illuminated if the faults are present for 2 consecutive trips

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Crankshaft Position–Camshaft Position Correlation Error

P0016  Crankshaft position – camshaft position correlation – bank 1 sensor A (Inlet)

P0017  Crankshaft position – camshaft position correlation – bank 1 sensor B (Exhaust)

P0018  Crankshaft position – camshaft position correlation – bank 2 sensor A (Inlet)

P0019  Crankshaft position – camshaft position correlation – bank 2 sensor B (Exhaust)

Description

The crankshaft position sensor is used to identify engine position and speed via a pole wheel mounted on the 

front end of the crankshaft.  The camshaft position sensor is used to determine camshaft position from a three 

vane reluctor on the rear end of the inlet and exhaust camshaft. Fault codes P0016, P0017, P0018, P0019 

indicate a mechanical timing error such as incorrectly set, or 'jumped' cam timing.

Monitor: 

•  Continuous

Enable Criteria:

•  Engine running (from cranking up to 4 seconds)

Disable Criteria: 

•  None

Malfunction Criteria: 

•  Camshaft out of phase with crankshaft > 16 degrees

Potential failure modes:

•  Static valve timing is incorrect

•  VVT camshaft actuator failure

•  VVT control valve stuck open / closed

•  VVT control valve filter

Diagnostic Mask:

•  The MIL will be illuminated if the faults are present for 2 consecutive trips

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Camshaft Timing Control (VVT)

P0076  Intake Valve Control Solenoid Circuit Low (Bank1)

P0077  Intake Valve Control Solenoid Circuit High (Bank1)

P0079  Exhaust Valve Control Solenoid Circuit Low (Bank1)

P0080  Exhaust Valve Control Solenoid Circuit High (Bank1)

P0082  Intake Valve Control Solenoid Circuit Low (Bank2)

P0083  Intake Valve Control Solenoid Circuit High (Bank2)

P0085  Exhaust Valve Control Solenoid Circuit Low (Bank2)

P0086  Exhaust Valve Control Solenoid Circuit High (Bank2)

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  P0076, P0079, P0082, P0085 - VVT control valve open circuit or short to ground

•  P0077, P0080, P0083, P0086 - VVT control valve circuit short to battery voltage

•  ECU output circuit failure

•  VVT control valve

Diagnostic Mask:

•  The MIL will be illuminated if the faults are present for 2 consecutive trips

                   

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

-Intake Air Flow

P0101  Mass or Volume Air Flow Circuit Range/Performance

P0102  Mass or Volume Air Flow Circuit Low Input

P0103  Mass or Volume Air Flow Circuit High Input

Description

The Mass Air Flow (MAF) sensor is incorporated into the airbox, and measures both intake air flow rate and 

Intake Air Temperature (IAT). The MAF sensor uses a hot wire exposed to the airflow, which is maintained at a 

constant temperature by a constant current flow. This is achieved within the sensor unit by varying the voltage 

applied to the hot wire. This voltage is the output signal from the MAF sensor.

Sensor connections

Sensor Connector    Description      ECU Pin    ECU Connector  

1              IAT Signal        J3     48 Way (Centre)

2              IAT Ground        E3     48 Way (Centre)

3              Battery Voltage      -          -

4              MAF Ground      J4     48 Way (Centre)

5              MAF Signal        G1     48 Way (Centre)

Sensor characteristics

0 – 330 g/sec

Typical values: 1.5 – 5.0 g/sec (idle), 5.0 – 15.0 g/sec (2500rpm elevated idle no load)

P0101

Monitor: 

•  Continuous.

Enable Criteria:

•  Engine running

•  Engine speed >1500rpm

•  Engine speed < 3510rpm

•  Fuel Learns enabled

Disable Criteria:

•  P0122, P0123, P0222, P0223 – Throttle/Pedal position fault codes

Malfunction Criteria: 

•  Measured MAF is compared to a predicted MAF based on current engine conditions.

•  Error > 40% for time > 1.5 secs

Potential failure modes:

•  MAF meter

•  Air induction system

•  Air intake hose connections

Diagnostic Mask:

•  The MIL will be illuminated if the faults are present for 2 consecutive trips

P0102

Monitor: 

•  Continuous.

Enable Criteria: 

•  Engine running

2009/02

 

 

 

 

 

 

 

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