Lexus ES manuals

Lexus ES: Definition Of Terms

DEFINITION OF TERMS

Term

Definition

Monitor Description

Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details).

Related DTCs

Group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic.

Typical Enabling Conditions

Preconditions that allow the ECM to detect malfunctions.

With all preconditions satisfied, the ECM 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 ECM to detect malfunctions.

Frequency of Operation

The number of times that the ECM checks for malfunctions per driving cycle.

"Once per driving cycle" means that the ECM detects a malfunction only once during a single driving cycle.

"Continuous" means that the ECM detects a malfunction every time the enabling conditions are met.

Duration

The minimum time for which the ECM 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 ECM 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 ECM illuminates the MIL the instant the ECM determines that there is a malfunction.

"2 driving cycles" means that the ECM illuminates the MIL if the same malfunction is detected again in the next driving cycle.

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 System Diagram

SYSTEM DIAGRAM

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS NEXT 3. CONNEC

 Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM use

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 Components

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 Removal

REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. REMOVE HOOD SUPPORT ASSEMBLY NOTICE: Avoid touching the piston rod as much as possible to prevent foreign matter from attaching to it. Be sure

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