Lotus 2004 Eleven Service Notes page 173

Lotus Service Notes Section EMP
Purge valve stuck open
A purge valve that is unable to seal correctly will result in a tank evacuation during the sealing phase of the
leak check sequence. In this phase, a pressure rise would normally be expected but when the purge valve
is not sealing this causes depression in the tank. When the pressure is below -1.7mbar a purge valve fault is
detected.
Purge valve stuck closed
A purge valve that is unable to open will not be able to achieve the required depression during the evacuation
phase. A positive pressure rise during the leak check evacuation phase will be detected. Additional purge checks
will set a purge valve fault code.
Monitor: Until leak check is completed
P0442
This code is set during the evaporative leak check process if the system calculates the measure of leak is above
a specified value (determined by a table related to fuel level) after the 6.3 second timer has expired.
Monitor: Until leak check is completed
Potential failure modes:
• Leak from pipes or connections
• Leaking or damaged seal on filler cap / not fitted correctly
• Canister Closure valve not fully closing
P0455
This code is set if during the evaporative leak check the system fails to reach the evacuation target pressure.
The system will perform additional purge checks to determine the nature of the problem. The additional purge
checks will also run if the leak check fails to complete because the calculated vapour concentration is above
the limit.
Additional Purge Check Enable Criteria:
• Vehicle not stationary
• Load between 30 – 35%
• Purge value >= 75%
Monitor: Until leak check is completed
Potential failure modes
• Fuel filler cap not fitted
• Leak from pipes or connections
• Canister Closure valve stuck open
P0456
This code is set during the evaporative leak check process if the system calculates the measure of leak is above
a specified value (determined by a table related to fuel level) after the 19.7 second timer has expired.
Monitor: Until leak check is completed
Potential failure modes:
• Leak from pipes or connections
• Leaking or damaged seal on filler cap / not fitted correctly
• Canister Closure valve not fully closing
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)
page FI-53
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