Lotus Elise / Lotus Exige. Manual - part 38

Page 26

 

 

Lotus Service Notes   

 

 

  Section EMP

Engine Speed / Position Sensors          P0340

P0340  Camshaft Position Sensor “A” Circuit

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 the VVT system.  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              Signal(VR Input)  16 (C1)    52 Way (Right)       

'06 M.Y. in brackets

2              Ground        42 (E2)    52 Way (Right)

Monitor: Continuous

Enable Criteria:

•  Engine running

•  Engine speed > 600rpm

Disable Criteria: None

Potential failure modes:

•  Sensor signal open circuit or short to ground

•  Sensor ground open circuit

•  Sensor failure

Notes:

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

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

pages DI-84 to DI-85

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Lotus Service Notes   

 

 

  Section EMP

Page 27

Ignition System                P0351

                          P0352

                          P0353

                          P0354

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

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                      '06 M.Y. in brackets

Connector Pin    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

No IGF signal to ECM while engine is running

Potential failure modes:

•  Open or short in IGF1 – IGF4 circuit from ignition coil to ECU

•  Coil failure

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-97 to DI-103

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Page 28

 

 

Lotus Service Notes   

 

 

  Section EMP

Catalyst System Efficiency             P0420

P0420  Catalyst System Efficiency Below Threshold

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 the same 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 number. If the ratio number is greater than 0.6 ('06 

M.Y.; 0.165) the code is set.

Sensor connections

Pre catalyst oxygen sensor

Sensor Connector    Description        ECU Pin    ECU Connector

1              Signal           15 (A3)    52 Way (Left)

2              Ground          41 (F4)    52 Way (Left)   

'06 M.Y. in brackets

3              Heater Supply      1 (K3)     52 Way (Left)

4              Battery Voltage     -        -

Post catalyst oxygen sensor

Sensor Connector    Description        ECU Pin    ECU Connector

1              Signal           3 (B3)     52 Way (Left)

2              Ground          29 (F4)    52 Way (Left)   

'06 M.Y. in brackets   

3              Heater Supply      27 (H3)    52 Way (Left)

4              Battery Voltage     -        -

Malfunction Criteria

•  Closed loop fuel control enabled

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

•  Baro > 756 mbar

•  Vehicle speed < 130 km/h (81 mph)

•  MAF < 40 g/sec

•  Air inlet temp > -10°C (14°F)

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

P0171, P0172                                         – Fuelling faults

P0300, P0301, P0302, P0303, P0304                          – Misfire faults

Potential failure modes:

•  Exhaust system leak

•  Oxygen sensor faults

•  Oxygen sensor heater failure

•  Catalyst failure

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-86 to DI-88

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Lotus Service Notes   

 

 

  Section EMP

Page 29

Evaporative Emission Control – Leak Detection System      P0441

                                          P0442

                                          P0455

                                          P0456 

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)

Description

During an Evaporative Emission System Leak Detection check, the vacuum in the system is monitored by ECU 

using the fuel tank pressure sensor. At the appropriate time, the test starts with the ECU closing the canister 

closure value and opening the purge solenoid with the appropriate duty cycle.  This allows the engine to draw 

a vacuum on the entire evaporative emission system. After a calibrated vacuum level is achieved the purge 

solenoid is closed, sealing the system. A leak is detected by monitoring any decrease in vacuum level over a 

calibrated period of time.

Sensor / component connections

Vapour Pressure sensor

Connector Pins   Description      ECU Pin    ECU Connector

1            Ground        78 (L4)    28 Way (Left)

2            Signal         75 (C1)    28 Way (Left)       

'06 M.Y. in brackets

3            5V V. Ref.      55 (M4)    28 Way (Left)

Purge Canister Closure Valve

Connector Pins   Description      ECU Pin    ECU Connector

A            Battery Voltage   -        -

B            ECU ground     9 (H2)     52 Way (Left)       

'06 M.Y. in brackets

Purge Solenoid

Connector Pins   Description      ECU Pin    ECU Connector

A            Battery Voltage   -        -

B            ECU ground     38 (F4)    52 Way (Right)       

'06 M.Y. in brackets

Enable Criteria:

•  Altitude < 8000 ft (2438 m), Baro > 700 mbar

•  Coolant > 45°C (113°F)

•  Air temp < 80°C (176°F)

•  Fuel level between 8 – 35 litres (2.1 – 9.24 US gallons)

•  Vehicle must be stationary

•  Closed loop fuelling control enabled

•  Closed loop idle speed control enabled

•  Ignition on

Disable Criteria:

P0171, P0172           – Fuel trim too rich or lean soft code

P0441, P0444, P0445     – Purge faults

P0446, P0447, P0448     – Canister closure faults

P0451, P0452, P0453     – Tank Pressure sensor faults

P0461, P0462, P0463     – Fuel level sensor faults

P0500               – Vehicle speed faults

Malfunction Criteria

P0441

This code can be caused by the purge value being either stuck closed or open.

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