DTC P2178, P2188

Discussion of tuning specific to MAZDASPEED3/MAZDASPEED Axela/Mazda 3 MPS vehicles
OMISPEED3
Posts: 32
Joined: November 7th, 2011, 9:29 pm
Location: Clarksville, TN

DTC P2178, P2188

Post by OMISPEED3 »

Hello guys!

My ecu is throwing these codes: P2178 & P2188. I checked every vacuum line, BOV seals, spark plugs and everything is ok. I only need to check my Injectors seals. I logged and the STFT & LTFT are -25% and sometimes 15%. The MAF and the Oxygen sensor are responding good. I have no idea what it could be. Any suggestions??

Best regards!

Sent from my Classic EVO!
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mituc
VersaTuner guru
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Joined: December 17th, 2011, 2:47 pm
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Re: DTC P2178, P2188

Post by mituc »

Just make this a bit more clear: is it the LTFT's -25 and +15? Let's just leave the STFT's out of the discussion for now...
Also please post your MAF cal, a CL MAF cal log and tell us what intake you have. Based on what the other users with the same intake have we may be able to determine if it's a bad/dirty MAF, some intake leak that goes away in certain conditions, and so on.
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
OMISPEED3
Posts: 32
Joined: November 7th, 2011, 9:29 pm
Location: Clarksville, TN

Re: DTC P2178, P2188

Post by OMISPEED3 »

Ok, my LTFT are -25%. The MAF housing is 3". The car was running good with only -0.8% on LTFT. Now with those DTC on the car idle is crazy and running very rich. You can smell the fuel out of the exhaust. I will later post logs.

Regards!

Sent from my Classic EVO!
Tuned with Image
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Steve @ VersaTune
Lead tuner
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Joined: March 29th, 2010, 12:58 pm

Re: DTC P2178, P2188

Post by Steve @ VersaTune »

Boost leak, MAF problem, or 02 sensor problem.
skiptownmcat
Posts: 383
Joined: August 3rd, 2011, 11:29 am

Re: DTC P2178, P2188

Post by skiptownmcat »

I'd lean towards O2 sensor if the idle is all over the show. It's probably trying to make stoich so is very erratic.
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Su tmic/corksport intake/kmd internals/grimmspeed ebcs/jbr ssp/forge bpv/3" custom tbe
OMISPEED3
Posts: 32
Joined: November 7th, 2011, 9:29 pm
Location: Clarksville, TN

Re: DTC P2178, P2188

Post by OMISPEED3 »

Well, the injector seals were broken, I replaced them with the SURE seals. So let see how the car works.
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kevstewart
Posts: 71
Joined: November 6th, 2011, 9:25 am
Location: Scotland

Re: DTC P2178, P2188

Post by kevstewart »

My fuel trims went like that when my purge solenoid valve failed... Can't remember the fault codes but its easy to test.
BNR stage1, 3" Downpipe w/200 cell, Autotech HPFP, Cpe TMIC, Cpe 3" SRI, HTP 3" tip, Amsoil filter w/Prefilter, GoFastBits BOV, Grimmspeed interrupt, NGK iridium IX, Snow Stage 2 meth w/Aquamist parts, Sure Juggernaught, Cpe diff brace.
Avtotronik
Posts: 3
Joined: July 4th, 2015, 5:44 pm

Re: DTC P2178, P2188

Post by Avtotronik »

Good afternoon! I'm sorry, but I unfortunately do not understand what the problem is over the author's theme? Can you explain in more detail? Thanks)
mituc
VersaTuner guru
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Joined: December 17th, 2011, 2:47 pm
Location: Iasi/Romania

Re: DTC P2178, P2188

Post by mituc »

The questions are addressed to those to at least understand the problems if not even know what the cause of the problem is. If you do not understand the question then most likely you shouldn't have replied to such an old thread.
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
fastmps3
Posts: 5
Joined: November 11th, 2014, 4:03 am

Re: DTC P2178, P2188

Post by fastmps3 »

Hi,

can this error codes occur after installing a 4" MAF (OD) housing? If i drive normally or faster it's all ok. But if i drive slowly with longer idle times (rush hour) i have these codes.
My MAF Cal is only made basicly with calculated values (OEM 2,6" to 3,74").

Regards
Marco
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