2005 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE

Definition Of Terms

DEFINITION OF TERMS CHART

Terms Definitions
Monitor Description of what ECM monitors and how to detect malfunctions (monitoring purpose and details)
Related DTCs A group of diagnostic trouble codes that are output by ECM based on the same malfunction detection logic.
Typical Enabling Conditions Preconditions that allow ECM to detect malfunction. With all preconditions satisfied, ECM sets DTC when monitored value(s) exceeds malfunction threshold(s)
Sequence of Operation Order of monitor priority, applied if multiple sensors and components involved in single malfunction detection process.
Sequence of Operation Each sensor and component monitored in turn and not monitored until previous detection operation is completed.
Required Sensors/Components Sensors and components used by ECM to detect each malfunction.
Frequency of Operation Number of times ECM checks for each malfunction during each driving cycle.
Frequency of Operation "Once per driving cycle" means ECM only performs checks for that malfunction once during single driving cycle.
Frequency of Operation "Continuous" means ECM performs checks for that malfunction whenever enabling conditions are met.
Duration Minimum time for which ECM must detect continuous deviation in monitored value(s) in order to set DTC. Timing begins when typical enabling conditions are met.
Malfunction Thresholds Values, beyond which, ECM determines malfunctions exist and sets DTCs.
MIL Operation Timing of MIL illumination after defect is detected.
MIL Operation "Immediate" means ECM illuminates MIL as soon as malfunction is detected.
MIL Operation "2 driving cycles" means ECM illuminates MIL if the same malfunction is detected twice during the next sequential driving cycle.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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