Weird Check Engine Light Issue - Toyota Yaris Forums

JHSmith · 02-24-2015, 10:06 PM

-invader166, I have this same issue right now on my '07 Yaris AT. I have a service appointment for this Saturday, please let me know of your progress and I'll do the same. BTW, is it very cold where you live? I live in Maine where it's been pretty cold, and at times like this I've noticed some funky electrical issues (could be a complete coincidence).

-CTScott, would a failure of that tranny switch lead to the check engine light illumination?

Thanks,

CTScott · 02-24-2015, 10:41 PM

Quote:

Originally Posted by JHSmith

-invader166, I have this same issue right now on my '07 Yaris AT. I have a service appointment for this Saturday, please let me know of your progress and I'll do the same. BTW, is it very cold where you live? I live in Maine where it's been pretty cold, and at times like this I've noticed some funky electrical issues (could be a complete coincidence).

-CTScott, would a failure of that tranny switch lead to the check engine light illumination?

Thanks,

Yes. The MIL should light with a P0705 code being stored.

JHSmith · 02-25-2015, 07:36 PM

-CTScott: Just tested it at AutoZone, it was in fact a P0705. Oddly enough though, the MIL was not illuminated at all today (but fortunately the code still registered). Since the light is off, do you think I'm safe at this point to not worry about it unless the MIL light returns? The vehicle starts and shifts just fine, even when the MIL was on.

CTScott · 02-25-2015, 08:07 PM

Quote:

Originally Posted by JHSmith

-CTScott: Just tested it at AutoZone, it was in fact a P0705. Oddly enough though, the MIL was not illuminated at all today (but fortunately the code still registered). Since the light is off, do you think I'm safe at this point to not worry about it unless the MIL light returns? The vehicle starts and shifts just fine, even when the MIL was on.

I would at least pull and clean the connector on the tranny (the large grey one by where the shifter cable connects).

invader166 · 02-26-2015, 02:59 AM

@JHSmith It's actually pretty warm where I live, about 10 degrees C (50 degrees F).

I plan on going to see a technician about the issue on Friday, but something interesting happened today. I wasn't able to connect a reader and check codes yet, but this afternoon, I accidentally slammed the passenger driver side a bit harder than usual, and all of a sudden, the gear indication in the dash returned. MIL is still active though, but the car runs and shifts pretty smooth.

I'm almost thinking this could have happened because of a loose connection, but I wanna check the codes and also have a look at the tranny connector CTScott mentioned. It's not the first time I've had problems with faulty connectors on this car.

invader166 · 02-26-2015, 05:53 PM

Update: So now the MIL is off without me having to reset anything. Problem solved?

02-26-2015, 02:59 AM	#5
invader166 Pumpman Drives: 2019 Kia Soul EV Base Join Date: Dec 2014 Location: Langley, BC Posts: 434	@JHSmith It's actually pretty warm where I live, about 10 degrees C (50 degrees F). I plan on going to see a technician about the issue on Friday, but something interesting happened today. I wasn't able to connect a reader and check codes yet, but this afternoon, I accidentally slammed the passenger driver side a bit harder than usual, and all of a sudden, the gear indication in the dash returned. MIL is still active though, but the car runs and shifts pretty smooth. I'm almost thinking this could have happened because of a loose connection, but I wanna check the codes and also have a look at the tranny connector CTScott mentioned. It's not the first time I've had problems with faulty connectors on this car. __________________ "I would rather loose by a mile in a car I built myself, then win by an inch in a car that was built for me." - Moog

02-26-2015, 05:53 PM	#6
invader166 Pumpman Drives: 2019 Kia Soul EV Base Join Date: Dec 2014 Location: Langley, BC Posts: 434	Update: So now the MIL is off without me having to reset anything. Problem solved? __________________ "I would rather loose by a mile in a car I built myself, then win by an inch in a car that was built for me." - Moog

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02-24-2015, 10:06 PM	#1
JHSmith Drives: 2007 Yaris Sedan Join Date: Jun 2010 Location: Camden, Maine Posts: 4	-invader166, I have this same issue right now on my '07 Yaris AT. I have a service appointment for this Saturday, please let me know of your progress and I'll do the same. BTW, is it very cold where you live? I live in Maine where it's been pretty cold, and at times like this I've noticed some funky electrical issues (could be a complete coincidence). -CTScott, would a failure of that tranny switch lead to the check engine light illumination? Thanks,

02-25-2015, 07:36 PM	#3
JHSmith Drives: 2007 Yaris Sedan Join Date: Jun 2010 Location: Camden, Maine Posts: 4	-CTScott: Just tested it at AutoZone, it was in fact a P0705. Oddly enough though, the MIL was not illuminated at all today (but fortunately the code still registered). Since the light is off, do you think I'm safe at this point to not worry about it unless the MIL light returns? The vehicle starts and shifts just fine, even when the MIL was on.