1996 to 2002 Toyota OBD II Catalyst Monitor Readiness Drive Patterns

The catalyst monitor on many Toyota vehicles can be difficult to complete.  That’s why it’s important to follow the Toyota recommended drive cycle after performing actions that are known to clear your Toyota’s computer memory.

Remember, all on-board diagnostic monitors are cleared when the battery is disconnected, or when the power train control module (PCM) is cleared with a scan tool.

CATALYST MONITOR DRIVE CYCLE INSTRUCTIONS

  1. Do not turn off the ignition switch during the test procedure.
  2. Allow the vehicle to run at idle until warmed up.
  3. Drive at a steady speed between 40 and 70 MPH for 10 minutes.  It’s a good idea to stay in the middle of this range, so 55 MPH is optimal.
  4. It may take several attempts and warm up cycles to complete the drive cycle.

toyota-drive-cycle-obd-readiness-monitor-smog-check

 

 

 

1996 to 2002 Toyota OBD II Monitor Readiness Drive Patterns

23 Replies to “1996 to 2002 Toyota OBD II Catalyst Monitor Readiness Drive Patterns”

  1. Charlie

    Do you have a drive pattern for 2004 Toyota Higlander? I am having a hard time to get the Catalyst ready.

    Reply
    • Julius Post author

      Hi Charlie, sorry for the late reply. Per Toyota, the following drive cycle should run the catalyst monitor on 2004 Toyota Highlanders:

      CATALYST MONITOR DRIVE CYCLE INSTRUCTIONS

      1. The monitor will not run if active diagnostic codes are present
      2. Do not turn off the ignition switch during the test procedure.
      3. Allow the vehicle to run at idle until fully warmed up. I usually recommended letting it idle for ten to fifteen minutes after sitting overnight.
      4. After warming up the vehicle, drive at a steady speed between 40 & 70 miles per hour. Tip: try to stay around the middle of this range (55MPH). Also, in Southern California, it may only be possible to maintain these speeds early on a weekend morning.
      5. You may need to extend the drive cycle.
      6. In most cases, you should be able to complete the catalyst monitor after following the drive cycle a couple of times.

      If several reasonable attempts at running the drive cycle fail to complete the catalyst monitor, a problem may exist that is preventing your vehicle from running the monitor to completion. In that case, it may be time to have your vehicle properly diagnosed and repaired by a shop that has the training, equipment, and experience necessary to diagnose and repair OBD monitor issues.

      Reply
    • danielkahale959

      2004 Toyota Highlander Drive Cycle for Catalyst Readiness Monitor:

      – Allow vehicle to warm up.
      – Drive at a steady speed between 40 and 70 mph for 10 minutes

      Reply
      • dewok

        Hi Paulette,

        For a 2001 Toyota, I would go with our standard 1996-2002 Toyota drive cycle as found on our website.

        Reply
  2. Amy C.

    We have a 2000 4Runner with the same issue of the catalyst drive monitor not being “ready.” How can I find the drive cycle for a 2000 4Runner “Per Toyota?” I’ve found several suggestions online, but they differ quite a bit from each other. I figure I better go with the manufacturer suggestion, but can’t find it. Thank you!

    Reply
    • Julius Post author

      Yes, I believe that the 1996 to 2002 Toyota OBD II Catalyst Monitor Readiness Drive Patterns, should also apply to your 2002 Toyota Celica.

      Reply
  3. Pingback: Drive cycle questions - Toyota Nation Forum : Toyota Car and Truck Forums

    • dewok

      Hi Krista,

      Although the drive cycle for a 2003 Toyota Camry might be slightly different, it’s worth giving it a try. As long as all the emission systems are working correctly, the readiness monitors should complete without setting a fault code (DTC) by the end of the drive cycle.

      Reply
    • dewok

      Hi Tom,

      I would go with the standard Toyota drive cycle listed on our website. Catalyst: allow warm up at idle from cold start / drive 55-60 mph steady for 10 minutes. EVAP can be trickier on some models.

      Reply
  4. Sandra

    After my car had its smog check and passed the engine light came on and I then took to repaire shop and they replaced a sensor . Light was off for about 4 hours and has been on ever since. the car runs fine and the shop has no idea what problem is. HELP

    Reply
    • dewok

      Hi Sandra,

      What is the year and model of the vehicle? What is the fault code (ie P0135)? Which sensor did your mechanic replace?

      Danny
      Just Smogs

      Reply
    • dewok

      Hi Sandra,

      A couple of questions … What is the year and model of the vehicle? What fault code (ie P0135) before and after the repair? Exactly what sensor was replaced?

      Danny
      Just Smogs

      Reply

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