I NEED Boost... Opinions puh-lease - Toyota Yaris Forums

Nexus1155 · 09-07-2010, 01:42 AM

Quote:

Edit: I just found that P2238 could also mean "Barometric Pressure Circuit Intermittent," when in relation to Toyotas. If this was the case, wouldn't it make more sense to get these two codes together?

Means you're car is seeing boost when its only suppose to see vacuum and the ECU is freaking the hell out.?

Focus_Sh1ft · 09-07-2010, 10:54 AM

Quote:

Originally Posted by Nexus1155

Means you're car is seeing boost when its only suppose to see vacuum and the ECU is freaking the hell out.?

This must be the case, because my bank 1 sensor 1 functions totally fine as per my narrowband.

pimp my yaris, lemme know what code(s) you have asap. Best case is we have similar codes...
It's interesting that it took a good deal of driving for your code to come on, because it was the same with me. You'd think that if this theory is correct that the light would come on almost immediately. I need to check how the ECU tests for this and determines there's a problem...

Focus_Sh1ft · 09-07-2010, 06:33 PM

Ok, I looked into all this further and realized two things. Firstly, the codes wouldn't come on immediately because it takes two drive cycles for the ECU to determine there is actually a recurring issue. Secondly, I was reading these codes as per the Yaris manual hosted online. P0101 definitely seems to be the maf signal voltage out of range (too high), as a result of boost conditions. As for P2238, the manual lists it as the O2 sensor acting up, not the barometric pressure circuit intermittent. I THINK this is a result of the car running excessively lean. Low positive current on the AF+ wire directly equates to lean conditions. I have a scangauge on the way so I'll run some diagnostics before getting tuned.

Definitely would rather see CELs after boosting than not seeing them. Otherwise the car would clearly just be baffled as to what's happening to it lol.

The cool thing is that if I'm right, a tune will sort out those two CELs. MAF clamping to represent boost conditions, and the proper air/fuel ratio done by fuels map would eliminate P2238.

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09-07-2010, 06:33 PM	#3
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Ok, I looked into all this further and realized two things. Firstly, the codes wouldn't come on immediately because it takes two drive cycles for the ECU to determine there is actually a recurring issue. Secondly, I was reading these codes as per the Yaris manual hosted online. P0101 definitely seems to be the maf signal voltage out of range (too high), as a result of boost conditions. As for P2238, the manual lists it as the O2 sensor acting up, not the barometric pressure circuit intermittent. I THINK this is a result of the car running excessively lean. Low positive current on the AF+ wire directly equates to lean conditions. I have a scangauge on the way so I'll run some diagnostics before getting tuned. Definitely would rather see CELs after boosting than not seeing them. Otherwise the car would clearly just be baffled as to what's happening to it lol. The cool thing is that if I'm right, a tune will sort out those two CELs. MAF clamping to represent boost conditions, and the proper air/fuel ratio done by fuels map would eliminate P2238.