Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE
Definition Of Terms
DEFINITION OF TERMS
| Term | Definition |
|---|---|
| Monitor Description | Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details) |
| Related DTCs | A group of diagnostic trouble codes that are output by ECM based on the same malfunction detection logic |
| Typical Enabling Condition | Preconditions that allow the ECM to detect malfunctions With all preconditions satisfied, the ECM sets the DTC when monitored value(s) exceed malfunction threshold(s) |
| Sequence of Operation | Order of monitor priority, applied if multiple sensors and components are involved in a single malfunction detection process Each sensor and component is monitored in turn and is not monitored until the previous detection operation is completed |
| Required Sensor/Components | Sensors and components used by the ECM to detect each malfunction |
| Frequency of Operation | The number of times the ECM checks for each malfunction during each driving cycle "Once per driving cycle" means that the ECM only checks for malfunctions once during a single driving cycle "Continuous" means that the ECM checks for malfunctions whenever enabling conditions are met |
| Duration | The minimum time for which the ECM must detect a continuous deviation in monitored value(s) in order to set a DTC Timing begins when Typical Enabling Conditions are met |
| Malfunction Thresholds | Value, beyond which, the ECM determines that a malfunction exists and sets a DTC |
| MIL Operation | Timing of MIL illumination after a malfunction is detected "Immediate" means that the ECM illuminates the MIL as soon as a malfunction is detected "2 driving cycle" means that the ECM illuminates the MIL if the same malfunction is detected a second time during next sequential driving cycle |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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