Terms
Terms
Technical identity, operating principles, applications and diagnostic links for Terms.
Alphabetical technical index
Term
Diagnostic trouble code
A code classifying a fault condition detected by a control unit.
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TermFreeze Frame Data
A snapshot of selected operating values stored by the ECU when a DTC is recorded.
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TermLive data
Parameters read from a control unit in real or near-real time.
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TermLong-term fuel trim
A slower learned fuelling adaptation responding to persistent trends.
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TermOBD-II
A standardised monitoring and diagnostic framework for emissions-related vehicle systems.
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TermPending trouble code
A code for a fault condition observed before permanent confirmation criteria are met.
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TermPermanent trouble code
A code class retained until the system verifies that an emissions-related repair is effective.
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TermShort-term fuel trim
A rapid fuelling correction responding to oxygen-sensor feedback.
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