Fault criteria, fuel system
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Fault criteria, fuel system
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If closed loop or adaptation reach an end position, the fuel system will be
considered to have developed a fault.
Fault criteria for closed loop are satisfied when the conditions for diagnosis are fulfilled
and the closed loop has been in the end position for more than 20
seconds.
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Conditions for closed loop diagnosis
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•
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coolant temperature above 60°C (140°F).
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Closed loop active
Fault criteria for adaptation are satisfied when the condition for diagnosis is
fulfilled and global adaptation is in the end position.
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Condition for adaptation diagnosis:
Ignition switch in ON position
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1.
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Short term fuel trim > 25%%
for 20 s
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2.
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Fault criteria for short term fuel trim fulfilled
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3.
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Short term fuel trim < 25%% for 20 s
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1.
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Global adaptation > 100%%
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2.
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Fault criteria for long term fuel trim fulfilled
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