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.
On-Board Diagnostic (OBD) With Scan Tool
These Self Tests should be used to diagnose the PCM and should be carried out in order.
- Self Test - Key ON Engine OFF (KOEO)
- Self Test - Continuous Memory Codes
- Self Test - Key ON Engine Running (KOER)
- Special Test Modes:
- Wiggle Test Mode
- Output Test Mode
- PCM Reset Mode
- Clearing DTCs P1000
- OBD II Drive Cycle
- Other Diagnostic Tool Features
For further information on other diagnostic testing features using the scan tool, refer to the INTRODUCTION - GASOLINE MODELS . Other diagnostic methods include the following.
- PID Access Mode
- Freeze Frame Data Access Mode
- Oxygen sensor Monitor Mode
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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.