OBD-II Drive Cycle

NOTE: DTC will set when a fault is present in the system. Not all DTCs will illuminate MIL. Anytime a DTC is set or a repair is made and DTCs are cleared from PCM memory, the I/M ready monitors will reset to NO. To reset I/M monitors to a ready status, OBD-II drive cycle must be performed. Go to step 1.

NOTE: PCM must see a change of at least 72°F (35°C) in ECT from the 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.

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 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 at a steady speed of 53-60 MPH for 5 minutes.
Stop the 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, the 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 all the previous steps at least one more time. If a step is interrupted, repeat the preceding step.

Follow the steps in order. If a step is interrupted, repeat the preceding step. Any safe driving mode is acceptable between steps.