Typical Enabling Conditions
WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.
ALL
| Monitor runs whenever the following DTCs are not stored | None |
CASE 1
| All of the following conditions are met | - |
| Battery voltage | 8 V or higher |
| Engine switch | Off |
| CPU clock elapsed time | 1.96608 seconds or more |
CASE 2
| All of the following conditions are met | - |
| Internal engine off timer (elapsed time from engine stop) | 10 minutes or more, and less than 30 minutes |
| Battery voltage | 8 V or higher |
| Engine switch | On (IG) |
| Starter | Off |
| ECM started by internal engine off timer last trip | Not reset |
| All of the following conditions are not met at last trip | 1 to 4 |
| 1. ECM power | On |
| 2. ECM wake up time by internal engine off timer | Reached |
| 3. ECM started by | Engine switch |
| 4. ECM started by | Internal engine off timer |
| All of the following conditions are met at last trip | 5 to 7 |
| 5. ECM internal engine off timer clock comparison monitor pass | Detected |
| 6. ECM internal engine off timer clock comparison monitor | Completed |
| 7. Following condition is met when ECM internal engine off timer clock comparison monitor is completed | - |
| Internal engine off timer | 0 seconds |
CASE 3
| All of the following conditions are met | - |
| Internal engine off timer (elapsed time from engine stop) | 40 minutes or more |
| Battery voltage | 8 V or higher |
| Engine switch | On (IG) |
| Starter | Off |
| ECM started by internal engine off timer last trip | Not reset |
| The shortest ECM wake up time by internal engine off timer | Not reset |
| All of the following conditions are not met at last trip | 1 to 4 |
| 1. ECM power | On |
| 2. ECM wake up time by internal engine off timer | Reached |
| 3. ECM started by | Engine switch |
| 4. ECM started by | Internal engine off timer |
| All of the following conditions are met at last trip | 5 to 7 |
| 5. ECM internal engine off timer clock comparison monitor pass | Detected |
| 6. ECM internal engine off timer clock comparison monitor | Completed |
| 7. Following condition is met when ECM internal engine off timer clock comparison monitor is completed | - |
| Internal engine off timer | 0 seconds |