NOTE: PCM must see a change of at least 72°F (35°C) in ECT from time engine is started until it reaches normal operating temperature of 158°F (70°C) before proceeding with drive modes of OBD-II drive cycle.

Connect scan tool to Data Link Connector (DLC). Start and warm engine to normal operating temperature of 158°F (70°C). Operate engine at idle for 2 minutes.

NOTE: Hold accelerator pedal very steady (53-60 MPH) during this step, otherwise test must be repeated.

Accelerate vehicle at a steady rate (1/4-1/2 throttle) until vehicle reaches 55 MPH. Release accelerator pedal for at least 10 seconds. Allow vehicle speed to drop and then quickly depress accelerator to increase speed to 53-60 MPH. Drive vehicle at a steady speed of 53-60 MPH for 5 minutes.
Stop vehicle.

NOTE: Using scan tool, ensure TP sensor voltage remains between 0.8-1.2 volts during acceleration. Constant and slow acceleration is important when accelerating vehicle during this test.

Accelerate vehicle at a steady rate until speed reaches 30-35 MPH. Drive at this speed for 20 seconds, then stop vehicle. Repeat steps 3) and 4) at least 3 times.
Accelerate smoothly until vehicle speed reaches 50-55 MPH and drive at this speed for about 3 minutes.
Stop vehicle and turn engine off for at least 5 seconds.
Repeat steps 1)-6) in order at least one more time. If a step is interrupted, repeat preceding step.

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.

Safety Warning

OBD-II Drive Cycle

Use the Manual With the Right Hardware

When to See a Mechanic

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