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How Many Miles For ECU Monitors To Set After Reset?

Discussion in 'Generation 1 Prius Discussion' started by Bruce Berquist, Dec 7, 2021.

  1. Bruce Berquist

    Bruce Berquist Junior Member

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    2003 Prius Sedan with reconditioned battery, new ECU, new HV Battery wire harness, new aftermarket Cat exhaust, new #2 O2 sensor.

    My new to me 2003 gen 1 sedan is finally running absolutely fantastically, like new, with no trouble lights and no trouble codes.

    I Love It!!!

    However, I also did all this to pass required NH Inspection, and though the car passes all safety and emissions tests in general, and the inspection station gave me a temporary sticker to drive with, they will not fully pass the inspection till all of the ECU/Monitors are set from the full reset they all had from the battery replacements.

    I put nearly 300 miles on the car, and had no codes, no resets, not battery disconnect, then took it back in to finish the inspection but was told that it still needed more miles because not all monitors had set, particularly the Catalyst and the EVAP monitors.

    I find it hard to believe that these all wouldn't have set by now at the mileage that I have driven.

    Is this normal?

    Or am I going to possibly be blind-sided by yet some other inspection frustration?

    Does anybody have experience with this or have any helpful advice?
     
    #1 Bruce Berquist, Dec 7, 2021
  2. vvillovv

    vvillovv Senior Member

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    #2 vvillovv, Dec 7, 2021
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  3. Tombukt2

    Tombukt2 Senior Member

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    All I can personally say is I'm so happy to be. out of new england this kinda shirt stills goes
    On Eh. I did not think it would ever stop..one big factor for me moving to SE USA I've none this . They implemented and revoked emissions testing whilst I've been here . Twas the biggest waste of time for the state . The city hated more than the citizens.. I call bullshiet on the equipment mfgr of test equip. But that's just me. Saves me money yearly not having emissions. I don't think it's yo car. My argument is sniffer do not detect nothing ....get off me

    SM-A715F ?
     
    #3 Tombukt2, Dec 8, 2021
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  4. Elektroingenieur

    Elektroingenieur Senior Member

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    Mileage doesn’t have much to do with it. In the Toyota 2001-2003 Prius OBD II Information (OTH022U), available by subscription to techinfo.toyota.com, the “OBD Monitor Drive Patterns” topic explains the specific conditions that are required for the readiness monitors to complete.

    For the Catalyst Monitor, Toyota writes:

    Preconditions
    The monitor will not run unless:
    • MIL is OFF
    • Intake Air Temperature (IAT) is 14 °F (−10 °C) or higher*
    • Engine Coolant Temperature (ECT) is 176 °F (80 °C) or higher
    * NOTE for 2002 MY and later: The readiness test can be completed in cold ambient conditions (less than 14 °F / −10 °C), if the drive pattern is repeated a second time after cycling the ignition switch OFF.
    ​
    Drive Pattern
    (a) Connect the hand−held tester to the DLC3 to the check monitor status and preconditions.
    (b) Drive vehicle at 40 to 55 mph (64 to 88 km/h) for approximately 3 minutes.
    NOTICE: Drive with smooth throttle operation and avoid sudden acceleration.
    If IAT is less than 50 °F (10 °C) when starting engine, continue to drive vehicle at 40 to 55 mph (64 to 88 km/h) for approximately 4 minutes.    ​
    (c) Drive vehicle at 35 to 45 mph (56 to 72 km/h) for approximately 7 minutes.
    NOTICE: Drive with smooth throttle operation and avoid sudden deceleration as much as possible (avoid sudden, full closure of the throttle).​
    (d) If readiness status does not switch to complete, ensure preconditions are met, turn ignition switch OFF, and then repeat steps “b” through “c”.​

    For the EVAP Monitor, Toyota writes:

    IMPORTANT
    To complete the “Internal Pressure Readiness” monitor, you must perform a “Cold Soak” procedure prior to conducting the driving pattern procedure.

    Cold Soak Preconditions
    The monitor will not run unless:
    • MIL is OFF
    • Altitude is 7,870 feet (2,400 m) or less
    Cold Soak Procedure
    Let vehicle cold soak for 8 hours or until the difference between IAT and ECT is less than 13 °F (7 °C)     [ . . . ]

    EVAP MONITOR DRIVING PATTERN

    Preconditions
    The monitor will not run unless:
    • MIL is OFF
    • Altitude is 7,870 feet (2,400 m) or less
    • Engine Coolant Temperature (ECT) is between 40 °F and 95 °F (4.4 °C and 35 °C)
    • Intake Air Temperature (IAT) is between 14 °F and 95 °F (−10 °C and 35 °C)
    • Cold Soak Procedure has been completed
    • Before starting the engine, the difference between ECT and IAT must be less than 13 °F (7 °C) [ . . . ]
    Drive Pattern
    (a) Connect the hand−held tester to DLC3 to check monitor status and preconditions.
    NOTICE: Do not turn the ignition switch OFF until drive pattern is complete.​
    (b) Release pressure in fuel tank by removing and then reinstalling the fuel tank cap.
    (c) Start the engine and immediately begin driving as directed.
    NOTICE: Drive on smooth roads to minimize fuel sloshing.​
    (d) Drive vehicle at 50 to 65 mph (80 to 104 km/h) for about 15 minutes.
    NOTICE: If vehicle speed drops under 45 mph (72 km/h), repeat step “d”.​

    The original includes figures showing speed vs. time. Toyota cautions the technician to drive safely and obey traffic laws and to “avoid sudden changes in vehicle load and speed.” They state, “In the event that the drive pattern must be interrupted [ . . . ] the drive pattern can be resumed and, in most cases, the readiness monitor will still set to complete.”
     
    #4 Elektroingenieur, Dec 8, 2021
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  5. Bruce Berquist

    Bruce Berquist Junior Member

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    NH does not use the sniffer so just goes by OBD readings.

    But yes, it does pass the sniffer and EPA sniffer particulates stats.

    After I installed the aftermarket cats and exhaust I was concerned about emissions for tuning purposes, due to the new exhaust system not having the OEM heat valve contraption on it. So I had a friend who owns a pro sniffer test the exhaust for me.
    It was well within specs.

    It helped me determine what directions to go in the case of any DTC that might come up during the restoration of this car I had just purchased.
     
    #5 Bruce Berquist, Dec 8, 2021
  6. Bruce Berquist

    Bruce Berquist Junior Member

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    Thank you so much for those details!

    I will follow those procedures and see how the results turn out.

    Thank you!
     
    #6 Bruce Berquist, Dec 8, 2021
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  7. Tombukt2

    Tombukt2 Senior Member

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    Wild that's really something. I guess that's why I don't have this problem if anybody gonna get the car hot . Twill be us he he.and we will put 80 on it purdy quick..I guess that must do it.. I'll have the crap changing do fast it'll forget what's happened. Beat the machine into submission

    SM-A715F ?
     
    #7 Tombukt2, Dec 8, 2021
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