Lotus Evora. Instruction - part 28

 

 

Lotus Service Notes   

 

 

  Section EMR

Ignition System

P0351  Ignition Coil “A” Primary/Secondary Circuit

P0352  Ignition Coil “B” Primary/Secondary Circuit

P0353  Ignition Coil “C” Primary/Secondary Circuit

P0354  Ignition Coil “D” Primary/Secondary Circuit

P0355  Ignition Coil “E” Primary/Secondary Circuit

P0356  Ignition Coil “F” Primary/Secondary Circuit

Description

A Direct Ignition System (DIS) is used on the engine. The DIS improves the ignition accuracy, reduces high-

voltage loss, and enhances the reliability of the ignition system. The DIS is a 1-cylinder system that ignites one 

cylinder with one ignition coil. The ECU determines the ignition timing and outputs the ignition signals (IGT) for 

each cylinder. Based on IGT signals, the power transistors in the igniter cuts off the current to the primary coil, 

which induces a spark at the spark plug connected to the secondary coil. The igniter will also send an ignition 

confirmation signal (IGF) as a fail-safe measure to the ECU. 

Component connections                     

Connector Pin  Description          ECU Pin                            ECU Connector

1          Supply Voltage        Coil 1    Coil 2    Coil 3    Coil 4    Coil 5    Coil 6 

2          Ignition Coil Feedback      D2     D2     D2     D2    D2      D2    32 Way (Left)

3          Coil Output (Logic)        F4     F3     F2     F1    E4         E3     32 Way (Left)

4          Ground         

Monitor: 

•  Continuous

Enable Criteria:  

•  Engine running

Malfunction Criteria:

•  No IGF signal to ECM while engine is running

Potential failure modes:

•  Open or short in IGF1 – IGF6 circuits from ignition coil to ECU

•  Coil failure

•  ECU

Diagnostic Mask:

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

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Catalyst System Efficiency

P0420  Catalyst System Efficiency Below Threshold (Bank 1)

P0430  Catalyst System Efficiency Below Threshold (Bank 2)

Description

The ECU compares the waveform of the oxygen sensors located before and after the catalyst to determine 

whether or not the catalyst has deteriorated. If the catalyst is functioning normally the front oxygen sensor will 

be switching between rich and lean whilst the rear oxygen sensor should also be switching between rich and 

lean but more slowly. When both the oxygen sensor waveforms change at a similar rate, it indicates that the 

catalyst performance has deteriorated. The ECU counts the number of pre and post catalyst oxygen sensor 

switches and divides one by the other to determine a ratio. If this ratio is too high a fault will be indicated.

Sensor connections

Pre catalyst oxygen sensor

Sensor Connector    Description        ECU Pin    ECU Connector

1 Bank 1         Signal              G3      48 Way (Centre)

2 Bank 1         Ground             J2        48 Way (Centre)        

3 Bank 1         Heater Supply         H3       48 Way (Centre)

4 Bank 1         Battery Voltage         -           -

1 Bank 2         Signal              G4      48 Way (Centre)

2 Bank 2         Ground             J2      48 Way (Centre)

3 Bank 2         Heater Supply         H4      48 Way (Centre)

4 Bank 2         Battery Voltage         -                       -

Post catalyst oxygen sensor

Sensor Connector    Description        ECU Pin    ECU Connector

1 Bank 1         Signal               H1      48 Way (Centre)

2 Bank 1         Ground              K4      48 Way (Centre)       

3 Bank 1         Heater Supply          K1      48 Way (Centre)

4 Bank 1         Battery Voltage          -          -

1 Bank 2         Signal             H2     48 Way (Centre)

2 Bank 2         Ground            K4     48 Way (Centre)

3 Bank 2         Heater Supply        K2     48 Way (Centre)

4 Bank 2         Battery Voltage        -          -           

Monitor: 

•  Continuous

Enable Criteria:

•  Closed loop fuel control enabled

•  Coolant temperature > 60 °C (140 °F)

•  Baro > 756 mbar

•  Vehicle speed < 130 km/h (81 mph)

•  MAF < 48 g/sec & MAF > 2 g/sec

•  Air inlet temp > -10°C (14°F)

•  Accumulated Mass Air > 2000-4080 grams depending on coolant temperature

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Disable Criteria:

•  P0101, P0102, P0103                                  – MAF faults

•  P0107, P0108                                        – MAP / Baro Faults

•  P0116, P0117, P0118                                – Coolant temperature faults

•  P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0139, P0140, P0141 – Oxygen sensor faults B1

•  P0151, P0152, P0153, P0154, P0155, P0157, P0158, P0159, P0160, P0161 – Oxygen sensor faults B2

•  P0171, P0172, P0174, P0175                              – Fuelling faults B1 / B2

•  P0300, P0301, P0302, P0303, P0304, P0305, P0306              – Misfire faults

•  P0500                                            – Speed sensor fault

Malfunction Criteria: 

•  Switch ratio between Pre & Post catalytic converter O2 sensors > 0.6

Potential failure modes:

•  Exhaust system leak

•  Oxygen sensor faults

•  Oxygen sensor heater failure

•  Catalyst failure

Diagnostic Mask:

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

 

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Evaporative Emission Control – Leak Detection System

P0441  Evaporative Emission System Incorrect Purge Flow

P0442  Evaporative Emission System Leak Detected (small leak)

P0455  Evaporative Emission System Leak Detected (large leak)

P0456  Evaporative Emission System Leak Detected (very small leak)

2009/02