PO171 - Toyota Yaris Forums

Focus_Sh1ft · 05-01-2011, 01:00 PM

Ok I understand the situation now. If P0101 is pending, that means a drive cycle has been completed and the ECU has detected a potential issue. A CEL isn't thrown until a set number of drive cycles is completed and the potential issue is present for all of them. Every code has a different required number of drive cycles necessary (and I believe a drive cycle is about 10 miles give or take). If I remember correctly, P0101 requires 2 drive cycles.

So what I would do from here (since you seem to have a code reader) is clear the pending codes in the Yaris. Keep the Echo MAF in the Yaris and do a decent amount of driving. If P0101 sets in then it's most likely the MAF. One other thing - does your Yaris have an aftermarket intake?

bronsin · 05-01-2011, 02:03 PM

Quote:

Originally Posted by Focus_Sh1ft

One other thing - does your Yaris have an aftermarket intake?

No it is completely stock. So is the ECHO.

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05-01-2011, 01:00 PM	#1
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Ok I understand the situation now. If P0101 is pending, that means a drive cycle has been completed and the ECU has detected a potential issue. A CEL isn't thrown until a set number of drive cycles is completed and the potential issue is present for all of them. Every code has a different required number of drive cycles necessary (and I believe a drive cycle is about 10 miles give or take). If I remember correctly, P0101 requires 2 drive cycles. So what I would do from here (since you seem to have a code reader) is clear the pending codes in the Yaris. Keep the Echo MAF in the Yaris and do a decent amount of driving. If P0101 sets in then it's most likely the MAF. One other thing - does your Yaris have an aftermarket intake?