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.
Intermittent Diagnostic Techniques: Notes
Intermittent diagnostic techniques help find and isolate the root cause of intermittent concerns associated with the PCM. The material is organized to help find the concern and carry out the repair. There are examples illustrating the diagnostic techniques. The process of finding and isolating an intermittent concern starts with recreating a concern symptom, accumulating PCM data, comparing that data to typical values, and analyzing the results.
Before proceeding, make sure that:
- Customary mechanical system tests and inspections do not reveal a problem. Mechanical component problems can make a PCM system react abnormally.
- Review the Technical Service Bulletins (TSBs) and OASIS messages, if available.
- The Quick Test and associated pinpoint tests have been completed without finding a concern, and the symptom is still occurring.
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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.