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2004 Kia Optima Question: throttle position sensor

 

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j5200, Tucson, AZ, September 24, 2009, 18:45
 Rookie

i replaced the tps and now the car idles at 1050 rpm a little high and the engine light comes on with same code. p0122. what should the voltage be at, at the plug for the tps if it say low circuit a? will a reset stop the high idle?

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  • Answer #1

    certified.ase.tech September 24, 2009, 20:01
     Journeyman

    voltage on the sensor wire should be about .5v engine off throttle plates closed & sweep up to around 4v at wide open throttle. Also take off the battery cables & touch them together to reset the computer.

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    j5200, September 25, 2009, 10:48
     Rookie

    still cant get it to idle normal when i put the car in park or neutral, keeps showing the tps - low circuit a, could it be something like the idle control valve or something before the tps? did i need to do something else after i put in the new tps?

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    certified.ase.tech, September 25, 2009, 11:41
     Journeyman

    if you didn't reset the computer by touching the cables together do that to reset it. also the tps is adjustable, loosen the mounting screws & turn it a little to see if this helps get your voltage high enough

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    j5200, September 25, 2009, 13:10
     Rookie

    i loosened the screws and was able to tilt the tps upward a degree or two and it fixed the idle, but when i disconnected the battery to reset or when i cycled the key back and forth a few times it won't start now? is this an anti theft, i checked the fuses and relays there good, the battery is good, any ideas how to get my car started now?

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    certified.ase.tech, September 25, 2009, 13:19
     Journeyman

    you might have set off the alarm if your vehicle has one. try letting it sit for a while to see if it will start again. most alarms like this will allow the car to run if you jump power to the small wire on starter with the key in run position. this will reset the alarm. do you have a security light on the dash, if so what's it doing. if you have a key fob close the doors & lock/unlock the car several times. no fob, try the driver door. ususally these things will go away if you can let the vehicle sit.

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    j5200, September 25, 2009, 15:08
     Rookie

    code is now po335 crankcase position sensor circuit a. thats why it won't start? possible i did it when cycling the key on/off? is there a way to reset or need to get a new one?

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    certified.ase.tech, September 25, 2009, 15:25
     Journeyman

    thats a code for the crank position sensor. if you can clear it. you might have disconected or moved some wires around so check that first. then unplug new tps & see if car starts. if so sensor may be shorted. if you have a problem with the crank sensor unplug it & see if the car will start. check for voltafe going to the sensor on pink wire. it would be unusual to have this sensor go bad imediately after another sensor unless there is an underlying problem. if you just replaced your timing belt it may have been damaged it's behind the lowest pulley on the engine. hopefully the connector or wire is just damaged.

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