Lexus ES: Definition Of Terms

Monitor description

Description of what the hybrid vehicle control ECU monitors and how it detects malfunctions (monitoring purpose and details).

Related DTCs

Group of diagnostic trouble codes that are output by the hybrid vehicle control ECU based on the same malfunction detection logic.

Typical enabling conditions

Preconditions that allow the hybrid vehicle control ECU to detect malfunctions.

With all preconditions satisfied, the hybrid vehicle control ECU stores a 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 one sensor is being monitored, the next sensor or component will not be monitored.

Required sensors/Components

The sensors and components that are used by the hybrid vehicle control ECU to detect malfunctions.

Frequency of operation

The number of times that the hybrid vehicle control ECU checks for malfunctions per driving cycle.

"Once per driving cycle" means that the hybrid vehicle control ECU detects a malfunction only once during a single driving cycle.

"Continuous" means that the hybrid vehicle control ECU detects a malfunction every time the enabling conditions are met.

Duration

The minimum time for which the hybrid vehicle control ECU must detect a continuous deviation in the monitored value(s) in order to store a DTC. Timing begins after the "typical enabling conditions" are met.

Typical malfunction thresholds

Value beyond which the hybrid vehicle control ECU will determine that there is a malfunction and stores a DTC.

MIL operation

MIL illumination timing after a malfunction is detected.

"Immediate" means that the hybrid vehicle control ECU illuminates the MIL the instant the hybrid vehicle control ECU determines that there is a malfunction.

"2 driving cycles" means that the hybrid vehicle control ECU illuminates the MIL if the same malfunction is detected again in the next driving cycle.

Component operating range

Normal operation range of sensors and solenoids under normal driving conditions.

Use these ranges as a reference.

The ranges cannot be used to judge if a sensor or solenoid is defective or not.