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
- Verify no I/M DTCs are present.
- If an I/M DTC is set that would prevent the I/M System Status tests from completing, diagnose that DTC before continuing.
- Go to next step: If no I/M DTCs are set
- 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 Complete System Set Procedure after repair.
- Go to next step: If no repair is required
- If a control module re-program or other repair is required,
- Observe the Inspection/Maintenance System Status or Data indicators.
- If any Inspection/Maintenance System Status or Data indicators report NO
Perform the Inspection/Maintenance Complete System Set Procedure .
- Go to next step: If no Inspection/Maintenance System Status or Data indicators report NO
- If any Inspection/Maintenance System Status or Data indicators report NO
- All OK.
Many DTC related repairs will instruct the technician to clear the DTC information. Clearing the DTC will reset the Inspection/Maintenance System Status or Data indicators to NO. Performing the I/M Complete System Set Procedure will set each of the I/M System Status indicators to YES.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.