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2004 Hyundai Accent Question: Evap not ready



Cassies Husband, 1.6L 4 Cylinder, Hillsboro, OR, March 24, 2011, 19:45

I took my Hyundai to DEQ and it failed for Evap, small leak. Someone suggested that I replace the gas cap, which I did. When I went back to DEQ it did not fail but EVAP said not ready. Was told to reset it I needed to complete the drive cycle. Have driven 60 city miles, 15 hwy. up to 60 mph and back to DEQ to have it show EVAP not ready. Any suggestions?

2 Answers
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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, March 24, 2011, 20:13

    Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out www.hmaservice.com lots of great information.
    The following is a summary of generic OBD II
    drive cycle instructions for a Hyundai:
    • The Intake Air Temperature (IAT) should be
    between 14 and 122 degrees F.
    • Barometric pressure should be equal to or
    greater than 75 kPa.
    • The fuel tank should be between 25 and 75%
    full at the start of the test.
    •During acceleration, keep throttle 1⁄4 to 1⁄2 open.
    • During deceleration, slow to less than 15 mph
    at an engine speed of less than 1000 rpm without
    touching the brake or clutch pedal.
    • During cruise, maintain a steady engine speed
    between 1400 and 4000 rpm.
    • At idle speed, keep the throttle closed and the
    gear selector in the Neutral position.
    Remember, these are just the preliminary
    instructions. The actual drive cycle must conform
    exactly to the following instructions, or the
    various monitors may not run to completion.
    • The drive cycle begins with a cold engine
    startup. The IAT must be between 32 and 85
    degrees F. Engine Coolant Temperature (ECT)
    must be less than 127 degrees F. It may be
    necessary for the customer to leave the car with
    you overnight so it can cool down completely.
    The engine coolant and intake air temperatures
    must be within a tight range to complete all of
    the OBD II monitors during the drive cycle. If
    the IAT input is not between 32 and 86 degrees
    F at the beginning of the drive cycle, the EVAP
    monitor will not run.
    • Start the engine and allow it to idle in Park for
    one to two minutes.
    •Within the first minute and a half, accelerate at
    1⁄4 to 3⁄4 throttle to 50-55 mph. Hold that speed for
    2-3 minutes. Unless your shop is very close to a
    major expressway, it may be difficult to satisfy this
    step in the drive cycle.
    •Decelerate to 0 mph without braking, then idle
    for 1-2 minutes. If you’re on an expressway, pull
    safely off the road during this segment.
    • Accelerate to 55 mph, using 1⁄4 to 3⁄4 throttle,
    then hold a steady cruise for 10 to 20 minutes.
    • Return to 0 mph with the engine idling in Park,
    then turn the ignition off.
    If you still have trouble check this link

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  • Answer #2

    March 25, 2011, 03:27

    As I posted in another posting of this question, Hyundai drive cycles are a bear to carry out...be advised.

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