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19:23 May 8, 2001 |
English to French translations [PRO] Tech/Engineering | |||||||
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| Selected response from: Didier Fourcot Local time: 03:31 | ||||||
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Summary of answers provided | ||||
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na | essai de fuite vers le bas du système d'alimentation en carburant |
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na | test de fuite du circuit d'alimentation |
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essai de fuite vers le bas du système d'alimentation en carburant Explanation: I'm not positive that "vers le bas" is necessary. automotive glossary |
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test de fuite du circuit d'alimentation Explanation: According to OBD-II (On-Board Diagnostic version II) regulation, now enforced in the US since some years and coming into enforcement in Europe, the whole fuel system, including tank, pipes, filling neck, etc, must be leak-proof. The OBD protocol mentions a test in which the purge and vent valves of the canister (reservoir filled with coal captating the fuel vapors) are closed, and a special pump pressurizes the canister, that remains in connection with the tank and filler neck. Pressure must not change for a specific amount of time; else specific DTC (Diagnostic Trouble Codes) are raised for MIL code 031: small leak (P0442) or large leak (P0445). OBD codes are a standard and can be read with any diagnostic tool from the diagnostic connector, usually located under the dashboard, driver's side. The "leak down" means that the fuel system is in pressure for the test, and thus the pressure drops down in case of leak: this is a pressure test, not a vacuum test. Please note from experience that the MIL code 031 with small or large leak is the most common occurrence of turning on the MIL "Check engine", most often simply because the filler neck has not been properly closed after filling the tank! I have a number of references of these in OBD II manuals and workshop manuals from various manufacturers, unfortunately these are on paper format or under Non-Disclosure Agreement. |
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