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.
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HOMESERVICE MANUALSTOYOTA2009FJ CRUISER RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - SFI SYSTEM INTRODUCTION, PRECAUTION, PARTS LOCATION, TROUBLESHOOTING, SYMPTOMS TABLE, DIAGNOSTIC TROUBLE CODE CHARTSFI SYSTEMDEFINITION OF TERMS
2009 Toyota FJ Cruiser RWD
Definition Of Terms
2009 Toyota FJ Cruiser RWDSECTION Definition Of Terms
DEFINITION TERMS CHART
| Terms | Definitions |
|---|---|
| Monitor Description | Description of what ECM monitors and how detects malfunctions (monitoring purpose and details) |
| Related DTCs | A group of diagnostic trouble codes that are output by ECM based on same malfunction detection logic. |
| Typical Enabling Conditions | Preconditions that allow ECM to detect malfunctions. With all preconditions satisfied, ECM sets DTC when monitored value(s) exceeds malfunction threshold(s) |
| Sequence of Operation | Order of monitor priority, applied if multiple sensors and components involved in single malfunction detection process. Each sensor and component monitored in turn and not monitored until previous detection operation completed. |
| Required Sensors/Components | Sensors and components used by ECM to detect each malfunction. |
| Frequency of Operation | Number of times ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means ECM only performs checks for that malfunction once during single driving cycle. "Continuous" means ECM performs checks for that malfunction whenever enabling conditions met. |
| Duration | Minimum time for which ECM must detect continuous deviation in monitored value(s) in order to set DTC. Timing begins when Typical Enabling Conditions met. |
| Malfunction Thresholds | Values, beyond which, ECM determines malfunctions exist and sets DTCs. |
| MIL Operation | Timing of MIL illumination after defect detected. "Immediate" means ECM illuminates MIL as soon as malfunction detected. "2 driving cycles" means ECM illuminates MIL if same malfunction detected second time during next sequential driving cycle. |
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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.