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.
Diagnostic Aids
I/M System Status display provides an indication of when control module has completed required DTC tests. This does not mean test has passed, only that a decision was made. If diagnostic fails, a DTC will set to indicate failure. If a failure indication is present for a DTC associated with one of the I/M regulated systems, it may prevent other required tests from running. For example, a DTC for control circuit of relay controlling AIR pump may not be listed in Inspection/Maintenance System DTC table, because it is a continuous test. If this DTC is set, Active Tests for AIR system may not run. The I/M System Status information may be useful for a technician to determine if diagnostics have run when verifying repairs.
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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.