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Home >> Toyota >> 1991 >> Corolla Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 4-CYL >> Ignition Checks >> Diagnostic Codes >> Notes

Diagnostic Codes: Notes

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NOTE: ECU is programmed to detect ignition problems. Checking for trouble codes can speed up diagnosis. If ECU detects a problem, a diagnostic code will be set in memory. For information on system self-diagnostic capabilities and how to retrieve codes, see TESTS W/CODES article in this section.