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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Toyota Yaris P1121

  • Tyler
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8 years 5 months ago #8461 by Tyler
Toyota Yaris P1121 was created by Tyler
Hey Droidkiller! I couldn't find a known good to compare to for you. :( Where are you from? In the States, the Yaris never came with a 1.4L, and didn't have electronic throttle control until later on.

Are we looking at APP 1 and 2 in your Pico capture? I ask because that kind of sawtooth pattern in the red trace is sometimes the result of the PCM momentarily pulling the signal to ground as part of it's circuit integrity check.

Is this a hard code, or does it reset intermittently?

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8 years 5 months ago #8473 by Caritech
Replied by Caritech on topic Toyota Yaris P1121
What's the vehicle actually doing?

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  • Noah
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8 years 5 months ago #8481 by Noah
Replied by Noah on topic Toyota Yaris P1121

Tyler wrote: Hey Droidkiller! I couldn't find a known good to compare to for you. :( Where are you from? In the States, the Yaris never came with a 1.4L, and didn't have electronic throttle control until later on.

Are we looking at APP 1 and 2 in your Pico capture? I ask because that kind of sawtooth pattern in the red trace is sometimes the result of the PCM momentarily pulling the signal to ground as part of it's circuit integrity check.

Is this a hard code, or does it reset intermittently?

Good to know! ;)

I'm gonna be looking for a Toyota with an electronic throttle all day now!

"Ground cannot be checked with a 10mm socket"

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