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Toyota Corolla Repair Manual: Definition of terms

Term

Definition

Monitor description Description of what the ecm monitors and how it detects malfunction (monitoring purpose and its details).
Related dtcs Diagnostic code
Typical enabling condition Preconditions that allow the ecm to detect malfunction.

With all preconditions satisfied, the ecm sets the dtc when the monitored value(s) exceeds the malfunction threshold(s).

Sequence of operation The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction.

While another sensor is being monitored, the next sensor or component will not be monitored until the previous monitoring has concluded.

Required sensor/components The sensors and components that are used by the ecm to detect malfunction.
Frequency of operation The number of times that the ecm checks for malfunction per driving cycle.
  • Once per driving cycle means that the ecm detects malfunction only one time during a single driving cycle.
  • Continuous means that the ecm detects malfunction every time when enabling condition is met.
Duration The minimum time that the ecm must sense a continuous deviation in the monitored value(s) before setting a dtc. This timing begins after the typical enabling conditions are met.
Malfunction thresholds Beyond this value, the ecm will conclude that there is malfunction and set a dtc.
Mil operation Mil illumination timing after a defect is detected.
  • Immediately means that the ecm illuminates the mil the instant the ecm determines that there is malfunction.
  • 2 Driving cycle means that the ecm illuminates the mil if the same malfunction is detected again in the 2nd driving cycle.
Data list/active test
1. Data list Hint: using the data list displayed by the handheld tester or the obd ii scan tool, you can read the value of the switches, sensors, actuators and so on without parts removal. Readi ...

Toyota/lexus part and system name list
This reference list indicates the part names used in this manual along with their definitions. ...

Other materials:

Using a flat bed truck
If you use chains or cables to tie down your vehicle, the angles shaded in black must be 45. Do not overly tighten the tie downs or the vehicle may be damaged. ■Before emergency towing 1 Vehicles without a smart key system: Put the engine switch in the ACC (engine off) or ON posi ...

Using the steering wheel switches
The steering wheel switches can be used to operate a connected cellular phone or portable digital audio player (portable player). Operating a Bluetooth phone using the steering wheel switches 1 Volume The voice guidance volume cannot be adjusted using these buttons. 2 Off-hook switch Turns t ...

General information
There are many ecu controlled systems used in the corolla. In general, ecu controlled system are considered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot. The fact is, however, that if you proceed by inspecting the circuits one by one, ...

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