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.
System Readiness Test: Description
As part of an enhanced emissions test for inspection and maintenance, certain states require the status of System Readiness Test (SRT) be used to indicate whether the ECM has completed the self-diagnosis of major emission systems and components. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a state emissions inspection due to one or more SRT items indicating INCMP, use this information to set the SRT to CMPLT.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT status will indicate CMPLT for each application system. Once set as CMPLT, the SRT status remains CMPLT until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's normal driving pattern. The SRT will indicate INCMP for these items.
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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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