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.
Circuit/System Testing
- Observe the Engine DTC information with a scan tool. Verify no DTCs are present.
- If a DTC is set that would prevent the I/M System Status tests from completing, diagnose that DTC before continuing. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Review applicable service bulletins for software updates that would prevent the I/M System Status tests from completing.
- If a control module re-program or other repair is required, perform the Inspection/Maintenance (I/M) Complete System Set Procedure .
- Observe the I/M System Status indicators.
- If any I/M System Status indicators report NO, perform the Inspection/Maintenance (I/M) Complete System Set Procedure .
- Observe the I/M Test DTC information with a scan tool. Verify there are no I/M Test DTCs present.
- If an I/M Test DTC is set and all of the I/M System Status indicators are Yes, there is no need to perform the Complete System Set Procedure. Diagnose the DTC using the Diagnostic Trouble Code (DTC) List - Vehicle and refer to Conditions for Clearing the I/M Test DTCs.
- If an I/M Test DTC is set and the I/M System Status indicators are NO, diagnosis the DTC and perform the Inspection/Maintenance (I/M) Complete System Set Procedure .
Many DTC related repairs will instruct the technician to clear the DTC information. Clearing the DTC will reset the I/M System Status indicators to NO. Performing the I/M Complete System Set Procedure will set each of the I/M System Status indicators to YES.
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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.