Lotus Evora. Manual - part 27

 

 

Lotus Service Notes   

 

 

  Section EMR

Potential failure modes:

•  Injectors or related codes

•  VVT system (clearance or timing) or related codes

•  MAF meter or related codes

•  Connectors and wiring for signs of corrosion or loose connections

•  Spark plug / coil / cylinder compression

•  PCV system / hoses

•  Fuel pressure

•  Coolant temperature sensor

•  Vacuum hoses

•  ECU

Diagnostic Mask:

•  The MIL will be illuminated if a fault is present for two consecutive trips.

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Knock Control System

P0327  Knock Sensor Circuit Low (Bank 1)

P0328  Knock Sensor Circuit High (Bank 1)

P0332     Knock Sensor Circuit Low (Bank 2)

P0333  Knock Sensor Circuit High (Bank 2)

Description 

The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The 

piezoelectric element sends continuously sends a signal to the ECU, when the cylinder block vibrates due to 

engine knocking this signal increases. The ECU is able to identify each cylinder. If knock is detected then the 

ECU will retard the ignition of the relevant cylinder to suppress it. 

The knock control sensor cannot differentiate between spark knock and other similar sounding noises. 

Sensor connections 

Sensor Connector    Description      ECU Pin    ECU Connector

1 Bank 1         Sensor input           D1        48 Way (Centre)     

2 Bank 1         Ground            C1           48 Way (Centre)

3 Bank 2              Sensor input        D2            48 Way (Centre)

4 Bank 2         Ground           C2             48 Way (Centre)

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Malfunction Criteria:

•  P0327 – This code is set when the bank 1 knock sensor signal is < 0.586 V

•  P0328 – This code is set when the bank 1 knock sensor signal is > 2.932 V

•  P0332 – This code is set when the bank 2 knock sensor signal is < 0.586 V

•  P0333 – This code is set when the bank 2 knock sensor signal is > 2.932 V

Potential failure modes:

•  Abnormal engine noise, i.e. damaged engine or exhaust system contacting vehicle

•  Knock sensor fixing too tight

•  Sensor connector / wiring corroded or loose connections

•  ECU

Diagnostic Mask:

•  The MIL will be illuminated if a fault is present for two consecutive trips.

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Engine Speed / Position Sensors

                             

P0335  Crankshaft Position Sensor “A” Circuit Range/Performance

Description

Engine speed is calculated by measuring the time between the ‘teeth’ of the crankshaft sensor trigger disc.  The 

disc has 34 ‘teeth’ and 2 missing ‘teeth’, spaced at 10 degree intervals around the disc.  The 2 missing ‘teeth’ 

are positioned at 225 degrees before cylinder No.1 and 4 TDC.  The crankshaft sensor signal is also used to 

determine misfires events.

Sensor connections

Sensor Connector    Description      ECU Pin    ECU Connector

1              Sensor input         A4          32 Way (Left)     

2              Ground            B2          32 Way (Left)

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Malfunction Criteria: 

•  15 crank errors in succession. This can occur due to no crank signal occurring whilst the cams continue to

count or if there is a measured consecutive crank error.

Potential failure modes:

•  Sensor signal open circuit or short to ground

•  Sensor ground open circuit

•  Sensor failure

•  Crankshaft sensor plate

•  ECU

Diagnostic Mask:

•  The MIL will be illuminated if this fault is present for two consecutive trips.

Notes:

If a sensor or sensor circuit failure occurs, the engine will not fire or start.

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Engine Speed / Position Sensors

P0341  Camshaft Position Sensor “A” Circuit (Bank 1)

P0346  Camshaft Position Sensor “A” Circuit (Bank 2)

P0366  Camshaft Position Sensor “B” Circuit (Bank 2)

P0391  Camshaft Position Sensor “B” Circuit (Bank 2)

Description

The camshaft position input to the ECU is used to determine engine phase, enable sequential fuel injection 

control and to determine camshaft position for VVT control.  The inlet camshaft has three ‘teeth’ spaced 90° 

apart, which are detected by the electromagnetic sensor.  The valve timing setting is measured in the ECU by 

measuring time from a (fixed position) crankshaft tooth to a (variable position) camshaft tooth.  As the engine 

speed and the position is known from the crankshaft sensor signal, the camshaft position can be calculated.

Sensor connections

Sensor Connector    Description      ECU Pin    ECU Connector

1 Inlet Bank 1      Signal                    A3        32 Way (Left) 

2 Inlet Bank 1      Ground             B3     32 Way (Left)

3 Supply voltage    5V                   D1     32 Way (Left)

1 Exhaust Bank 1    Signal           D4     32 Way (Left)

2 Exhaust Bank 1    Ground          C3     32 Way (Left)

3 Supply voltage    5V                   D1     32 Way (Left)

1 Inlet Bank 2      Signal           A2     32 Way (Left)

2 Inlet Bank 2      Ground          C2     32 Way (Left)

3 Supply voltage    5V                   D1     32 Way (Left)

1 Exhaust Bank 2    Signal           D3     32 Way (Left)

2 Exhaust Bank 2    Ground          C4     32 Way (Left)

3 Supply voltage    5V                   D1     32 Way (Left)

Monitor: 

•  Continuous

Enable Criteria:

•  Engine running

•  Engine speed > 600rpm

•  Engine runtime > 4 secs

Disable Criteria: 

•  None

Malfunction Criteria:

•  15 revolutions of crankshaft without receiving camshaft signal

Potential failure modes:

•  Sensor signal open circuit or short to ground

•  Sensor ground open circuit

•  Sensor failure

•  Cam failure

•  Camshaft position plate

•  ECU

Diagnostic Mask:

•  The MIL will be illuminated if a fault is present for two consecutive trips.

Notes:

Fault code P0341 will also be generated if the vehicle fails security checks on start up.

2009/02