Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
SFI SYSTEM - PROBLEM SYMPTOMS TABLE
Use the table below to help determine the cause of the problem symptom. The potential cases of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
| Symptom | Suspected area | See page |
| Engine does not crank (Does not start) | 1. Push-start function initialization | |
| 2. Immobiliser system | ||
| 3. ECM power source circuit | ||
| 4. VC output circuit | ||
| 5. Starter | ||
| 6. Starter relay | ||
| 7. Park/neutral position switch | ||
| No initial combustion (Does not start) | 1. ECM power source circuit | |
| 2. Fuel pump control circuit | ||
| 3. ECM | ||
| Engine cranks normally but difficult to start | 1. Fuel pump control circuit | |
| 2. Compression | ||
| Difficult to start with cold engine | 1. Cranking holding function circuit | |
| 2. Ignition system | ||
| 3. Spark plug | ||
| 4. Fuel pump control circuit | ||
| 5. Injector | ||
| Difficult to start with warm engine | 1. Cranking holding function circuit | |
| 2. Injector | ||
| 3. Ignition system | ||
| 4. Spark plug | ||
| 5. Fuel pump control circuit | ||
| High engine idle speed (Poor idling) | 1. ECM power source circuit | |
| 2. A/C signal circuit (compressor circuit) | - | |
| 3. Electronic throttle control system | ||
| 4. Air induction system | - | |
| 5. PCV hose | - | |
| Low engine idle speed (Poor idling) | 1. A/C signal circuit (compressor circuit) | - |
| 2. Fuel pump control circuit | ||
| 3. Electronic throttle control system | ||
| 4. Air induction system | - | |
| 5. PCV hose | - | |
| Rough idling (Poor idling) | 1. Compression | |
| 2. Fuel pump control circuit | ||
| 3. Electronic throttle control system | ||
| 4. Air induction system | - | |
| 5. PCV hose | - | |
| Hunting (Poor idling) | 1. ECM power source circuit | |
| 2. Fuel pump control circuit | ||
| 3. Spark plug | ||
| 4. Ignition system | ||
| 5. Injector | ||
| 6. Electronic throttle control system | ||
| 7. Air induction system | - | |
| 8. PCV hose | - | |
| Hesitation/ Poor acceleration (Poor driveability) | 1. Fuel pump control circuit | |
| 2. Spark plug | ||
| 3. Ignition system | ||
| 4. Injector | ||
| Surging (Poor driveability) | 1. Spark plug | |
| 2. Fuel pump control circuit | ||
| 3. Ignition system | ||
| 4. Injector | ||
| Engine stalls soon after starting | 1. Fuel pump control circuit | |
| 2. Spark plug | ||
| 3. Ignition system | ||
| 4. Injector | ||
| 5. Vacuum sensor circuit | - | |
| Engine stalls during A/C operation | 1. A/C signal circuit (Compressor circuit) | - |
| 2. ECM |