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Tire pressure light, intermittent cruise

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Noahfecks, Jul 29, 2019.

  1. Noahfecks

    Noahfecks Junior Member

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    So I am experiencing two issues, not sure they are related, I searched but did not find another thread that helped.

    2008, 142K mi, Hybrid drive batteries replaced at dealer about 16 months ago along with 12V battery. Replaced aux water pump last year.

    Tire pressure light has been on for several months, it did start after I bought new tires. Tire shop reset the TPS several times but I have the 1 min flash then on solid.

    Intermittent cruise, appears to be happening more frequently. It used to happen when I lost traction over washboard bumps on gravel roads, now it seems to happen even when driving on the blacktop. I suspect that it has to do with the traction control. I also have issues while breaking where a bumpy surface kicks off the ABS and braking function lets go until traction is re-established.

    I have checked the ABS cables at the wheels and all seem solid.

    I do not have a code reader so not sure what code(s) maybe present.

    Any help or suggestions are appreciated.
     
    #1 Noahfecks, Jul 29, 2019
  2. jerrymildred

    jerrymildred Senior Member

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    I don't see how they would be related. Tire pressure light is probably just a battery unless they replaced them with the new tires. Or you actually have a low tire.

    The ABS acting up on bumpy surfaces is a "feature" of the Gen 2. It's a little aggressive in that regard.

    The intermittent cruise could be related to the ABS if you have a tire speed sensor that's acting up. Maybe a bad wire, failing sensor, out of position, sensor or something like that. A code reader may or may not help you narrow it down.
     
    #2 jerrymildred, Jul 30, 2019
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  3. sam spade 2

    sam spade 2 Senior Member

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    First, make sure that you still have the sensor valve stems in place. The tire shop may have lost yours.......accidentally.
    If one or more of the sensors has gone bad.......you probably won't like the cost of a replacement, from Toyota that is.

    Intermittent loss of cruise control is sometimes caused by the brake light switch.
     
    #3 sam spade 2, Jul 30, 2019
  4. wjtracy

    wjtracy Senior Member

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    TPMS start going bad around the 10-year mark somethines earlier. Many many threads.
    TPMS Management with Techstream | PriusChat

    The other thing I do not know could be the brake actuator problem which is not fun.
     
    #4 wjtracy, Jul 30, 2019
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  5. bisco

    bisco cookie crumbler

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    do the other steering wheel buttons work with the wheel in all positions?

    make sure there is movement in the inverter fluid reservoir with the car 'ready'
     
    #5 bisco, Jul 30, 2019
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  6. Noahfecks

    Noahfecks Junior Member

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    Replaced the 12V when the hybrid drive batteries were replaced

    "Feature" makes me smile

    I may have to road trip to the parts store to have then read the codes

    Sensor valve stems = steel threaded stems? If so it appears I have all 4

    Already ordering a new brake switch under the throw parts at it category. probably a routine maintenance item at this point

    Everything but the cruise works as it should.

    Yes I have fluid movement, replaced the water pump in that system just last year
     
    #6 Noahfecks, Jul 30, 2019
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  7. sam spade 2

    sam spade 2 Senior Member

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    Who said anything about a button ?
    Or about inverter cooling ???
     
    #7 sam spade 2, Jul 30, 2019
  8. bisco

    bisco cookie crumbler

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    cruise can be affected by the clock spring or the inverter pump, iirc
     
    #8 bisco, Jul 30, 2019
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  9. jerrymildred

    jerrymildred Senior Member

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    I'm pretty sure that is correct.
     
    #9 jerrymildred, Jul 30, 2019
  10. Noahfecks

    Noahfecks Junior Member

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    I will check the connections on the inverter ump to make sure they are all still tight.

    Clock spring? Is that like a set of vapor locks? you guys wouldn't pull my leg would ya?
     
    #10 Noahfecks, Jul 30, 2019
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  11. Noahfecks

    Noahfecks Junior Member

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    Ok you guys aren't kidding

    Ouch on the price, anything to try and verify before I pony up $230? Everything else on the steering wheel is working
     
    #11 Noahfecks, Jul 30, 2019
  12. bisco

    bisco cookie crumbler

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    it's poly fine then. make sure you rotate the wheel all the way left and right as you try it.

    maybe it's just a cruise control system problem.
     
    #12 bisco, Jul 30, 2019
  13. sam spade 2

    sam spade 2 Senior Member

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    Yes. Maybe. Likely.
    Check the brake switch first.
     
    #13 sam spade 2, Jul 31, 2019
  14. Skibob

    Skibob Senior Member

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    You can see if your TPMS sensors are working if you have techstream. It shows the pressures and temperature of each tire. If one says 0 you know it’s dead
     
    #14 Skibob, Jul 31, 2019
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  15. Noahfecks

    Noahfecks Junior Member

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    I put 300 miles on today and I don't think it's the clock spring. I really tried to make any of the other steering wheel buttons malfunction. Fortunately they didn't

    Can anyone tell me more about the cruise system? Toyota clearly designed it differently than my Landcruiser
     
    #15 Noahfecks, Jul 31, 2019
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