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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