You will need to drive your Jeep Cherokee in order to perform a Drive Cycle and allow the ECU to self-test it's emission components and set required Readiness Flags (also known as emission monitors). In order to set the required emission monitors you will need to drive your Jeep for at least 200 miles, over the course of at least a week.
Take extra caution while performing drive cycles on public roadways. Drive cycles can be difficult to follow under normal driving conditions. Insure you begin the Drive Cycle in the morning when your Jeep Cherokee is cool.
The Following is Standard OBD II Drive Cycle required to set all emission monitors, including the EVAP monitor, O2 monitor and CAT monitor.
Begin by:
- Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on.
- Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle.
- Hold at a steady speed of 55 mph for three minutes.
- Decelerate (coast down) to 20 mph without braking or depressing the clutch.
- Accelerate back to 55 to 60 mph at ¾ throttle.
- Hold at a steady speed of 55 to 60 mph for five minutes.
- Decelerate (coast down) to a stop without braking.
If all other emissions systems are functioning properly, completing the drive cycle above will set the "readiness flags" required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog inspection.
