Lotus 2004 ELISE Service Notes page 152

Lotus Service Notes
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)
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
1
2
3
Purge Canister Closure Valve
Connector Pins
A
B
Purge Solenoid
Connector Pins
A
B
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
P0441, P0444, P0445
P0446, P0447, P0448
P0451, P0452, P0453
P0461, P0462, P0463
P0500
Malfunction Criteria
P0441
This code can be caused by the purge value being either stuck closed or open.
sn_emp_cyclone.indd 29
Description ECU Pin
Ground 78 (L4)
Signal 75 (C1)
5V V. Ref. 55 (M4)
Description ECU Pin
Battery Voltage -
ECU ground 9 (H2)
Description ECU Pin
Battery Voltage -
ECU ground 38 (F4)
– Fuel trim too rich or lean soft code
– Purge faults
– Canister closure faults
– Tank Pressure sensor faults
– Fuel level sensor faults
– Vehicle speed faults
P0441
P0442
P0455
P0456
ECU Connector
28 Way (Left)
28 Way (Left) '06 M.Y. in brackets
28 Way (Left)
ECU Connector
-
52 Way (Left) '06 M.Y. in brackets
ECU Connector
-
52 Way (Right) '06 M.Y. in brackets
Section EMP
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