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.
OBD-II Drive Cycle Test Procedure
The primary function of OBD-II Drive Cycle is to clear DTC P1000. OBD-II Drive Cycle assists in identifying an OBD-II system problem through total monitor testing. See Fig 1. Rerunning certain parts of drive cycle will verify repair of some monitor systems.
- For HO2S monitor repair verifications, perform steps 1) through 4) and steps 10) and 11).
- For EGR monitor repair verification, perform Steps 1) through Step 5) and steps 10) and 11).
- For Evaporative Emission monitor repair verification, perform Step 1) and Steps 7) through 11).
- For Misfire Detection monitor repair verification, perform the Misfire Detection Repair Verification Drive Cycle when directed here from the Misfire Pinpoint Tests. See MISFIRE DETECTION REPAIR VERIFICATION DRIVE CYCLE .
- For all other monitor repair verification, perform entire OBD-II Drive Cycle if directed here from the EEC-V Pinpoint Tests.
If driver is working alone, scan tool can be used after drive cycle is completed to view monitor system status. A scan tool can be installed in vehicle before drive cycle to observe DTC output. Scan tool an be used anytime through the couse of a drive cycle to observe monitor completion status by viewing On-Board Readiness Menu and PID Monitor Data Record Function.
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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.