Lotus Elise / Lotus Exige. Manual - part 37

Page 22

 

 

Lotus Service Notes   

 

 

  Section EMP

Misfire                      P0300

                          P0301

                          P0302

                          P0303

                          P0304

P0300  Random/Multiple Cylinder Misfire Detected

P0301  Cylinder 1 Misfire Detected

P0302  Cylinder 2 Misfire Detected

P0303  Cylinder 3 Misfire Detected

P0304  Cylinder 4 Misfire Detected

Description

A misfiring cylinder can be detected by analysing crank speed variation. As a result of a combustion event there 

will be a net acceleration of the crankshaft. Subsequent to a misfire event the engine will decelerate over the 

period following the missed cylinder event.

Speed changes can be characterised by observing changes in the time period for a fixed angle of rotation after 

firing events. A significant change in this period, assessed by comparison to previous periods, may be attributed 

to misfire on a known cylinder. 

Component connections                    '06 M.Y. in brackets

Connector    Description          ECU Pin                    ECU Connector

1          Supply Voltage        Coil 1   Coil 2   Coil 3   Coil 4 

2          Ignition Coil Feedback   22 (F3)  22 (F3)  22 (F3)  22 (F3)  52 Way (Right)

3          Coil Output (Logic)     52 (G1)  26 (G4)  47 (G3)  48 (G2)  52 Way (Right)

4          Ground                     

Malfunction Criteria

The operation of all the misfire codes is the same, the last digit relates to the misfire involved i.e. a code P0303 

indicates there is a problem with coil number 3. P0300 indicates the misfire is random and not linked to one 

particular cylinder.

Enable Criteria:

•  Battery voltage between 10 – 16 V

•  Coolant temperature between -10 – 120°C (14 – 248°F)

•  Engine speed between 660 – 8010rpm

•  Engine speed transient > 15rpm

•  Altitude < 8000 ft (2438 m) / Baro > 756mbar

•  Fuel level > 5 litres (1.3 US gallons)

•  Engine load between 15 – 48% depending on engine speed

Disable Criteria: DFCO enabled (Deceleration Fuel Cut Off)

Monitor: Continuous

Limp home:

•  Limit maximum engine speed to 6000 rpm

•  Return the fuel system to open loop

•  ECU may deactivate two cylinders, the misfiring cylinder and it’s matched other i.e. 1 & 4 or 2 & 3.

Potential failure modes:

•  Injector related codes, as these can cause misfire codes to be set.

•  VVT or VVL codes set

•  Sensor connector and wiring for signs of corrosion or loose connections

•  Spark plug / Cylinder compression

•  Cam timing / Damage to rocker arm assembly

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Lotus Service Notes   

 

 

  Section EMP

Page 23

Notes:

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

•  Further information on the sensor may be found inToyota 1ZZ-FE, 2ZZ-GE manual RM733E (B120T0327J) 

pages DI-73 to DI-78

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Page 24

 

 

Lotus Service Notes   

 

 

  Section EMP

Knock Control System            P0324

                          P0327

                          P0328

P0324  Knock Control System Error

P0327  Knock Sensor 1 Circuit Low

P0328  Knock Sensor 1 Circuit High

Description 

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

piezoelectric element sends the signal to the ECU, when the cylinder block vibrates due to engine knocking. 

If knock is detected then the ECU will retard the ignition to suppress it. The knock control sensor cannot dif-

ferentiate between spark knock and other similar sounding noises. 

Sensor connections

Sensor Connector    Description      ECU Pin    ECU Connector

1              Sensor input     43 (C4)    52 Way (Right)       

'06 M.Y. in brackets

2              Ground        13 (A4)    52 Way (Right)

Malfunction Criteria

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

P0328 – This code is set when the knock sensor signal is > 2.928 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

Notes:

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

•  Further information on the sensor may be found inToyota 1ZZ-FE, 2ZZ-GE manual RM733E (B120T0327J) 

pages DI-79 to DI-81

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Lotus Service Notes   

 

 

  Section EMP

Page 25

Engine Speed / Position Sensors        P0335

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     4 (E1)     52 Way (Right)       

'06 M.Y. in brackets

2              Ground        30 (E4)    52 Way (Right)

Monitor: Continuous

Enable Criteria: Engine running

Disable Criteria: None

Potential failure modes:

•  Sensor signal open circuit or short to ground

•  Sensor ground open circuit

•  Sensor failure

Notes:

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

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

•  Further information on the sensor may be found inToyota 1ZZ-FE, 2ZZ-GE manual RM733E (B120T0327J) 

pages DI-82 to DI-83

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