PO103 MAF Input Too High...

Ken Cravillion · 11-21-2008, 09:16 AM

...Meaning voltage was too excessive for an extended period of time on the MAF signal circuit.

Mods: VF39 (ported/polished), STi IC, UTEC Delta, SPT intake, protuned, TXS TBE...

I have been having issues for the last few weeks and we been trying to figure out the problem... Basically, anytime I get into boost the above error happens. When it happens the car stutters and shuts off. Usually followed by the IGN fuse blowing. Not fun when on the highway... I've talked to some people including my tuner and we have a few ideas. The tuner P&L thinks the UTEC is pulling too much voltage. Someone else thinks maybe the MAF is getting condensation... The dealer thinks the MAF is OK...

Integrity Performance · 11-21-2008, 09:34 AM

I cant possibly see it being the UTEC, I am thinking its some other electrical gremlin, because of the fuse blowing. Remove the UTEC and drive it around a little while, it wont pop just driving it for enough time to figure out if the problem will happen or not. If it doesnt happen, then its the UTEC, if it does, then its not the UTEC. But I cant see how the UTEC could blow ign fuses. Especially since the maf circuit is separate from the ign to begin with. I dont even think its a MAF problem. Possibly a main body ground issue? I dont know where it is on our cars, probably up under the dash bolted to the side pillar or somewhere. Find it and make sure its ok?

Ken Cravillion · 11-21-2008, 09:37 AM

I forgot to mention that when the dealer had it they tried it w/o the UTEC and it didn't blow...

Ken Cravillion · 11-25-2008, 03:30 PM

Anyone know where the ground is? Just tried another MAF sensor to check and it still did the same thing. Though this time I didn't get the error code. I just bucked and shut off...

gandapanda · 11-25-2008, 06:44 PM

My theory; its not the MAF; it's either the ECU, fuel pump relay (less likely), or one or more of the ignition coils (even less likely); the following are from the FSM, and I've followed fuse #11 to the items I have listed above.

It has to be something w/ the UTEC since that's the one thing that was modified in your FXT; either the ECU has some type of internal damage (and some internal current draw is causing the popped fuses) OR there is a power wire that is grounding out causing an increased current draw OR the UTEC is installed incorrectly. Where is the UTEC getting its power from?

11-21-2008, 09:16 AM	#1 (permalink)
Ken Cravillion Teh Fotografer Contributing Member Join Date: Dec 2007 Location: Oshkosh, WI Posts: 642 Gallery: 0 iTrader: 1 / 100%	PO103 MAF Input Too High... ...Meaning voltage was too excessive for an extended period of time on the MAF signal circuit. Mods: VF39 (ported/polished), STi IC, UTEC Delta, SPT intake, protuned, TXS TBE... I have been having issues for the last few weeks and we been trying to figure out the problem... Basically, anytime I get into boost the above error happens. When it happens the car stutters and shuts off. Usually followed by the IGN fuse blowing. Not fun when on the highway... I've talked to some people including my tuner and we have a few ideas. The tuner P&L thinks the UTEC is pulling too much voltage. Someone else thinks maybe the MAF is getting condensation... The dealer thinks the MAF is OK... __________________ Ken <-Myself 2008 WRB FSXT VF39 <-My mods http://www.kgcphoto.com <-My site

11-21-2008, 09:37 AM	#3 (permalink)
Ken Cravillion Teh Fotografer Contributing Member Join Date: Dec 2007 Location: Oshkosh, WI Posts: 642 Gallery: 0 iTrader: 1 / 100%	I forgot to mention that when the dealer had it they tried it w/o the UTEC and it didn't blow... __________________ Ken <-Myself 2008 WRB FSXT VF39 <-My mods http://www.kgcphoto.com <-My site

11-25-2008, 03:30 PM	#4 (permalink)
Ken Cravillion Teh Fotografer Contributing Member Join Date: Dec 2007 Location: Oshkosh, WI Posts: 642 Gallery: 0 iTrader: 1 / 100%	Anyone know where the ground is? Just tried another MAF sensor to check and it still did the same thing. Though this time I didn't get the error code. I just bucked and shut off... __________________ Ken <-Myself 2008 WRB FSXT VF39 <-My mods http://www.kgcphoto.com <-My site

11-25-2008, 06:44 PM	#5 (permalink)
gandapanda Contributing Member Join Date: Jan 2006 Location: NW ChicagoLand Posts: 588 Gallery: 0 iTrader: 3 / 100%	My theory; its not the MAF; it's either the ECU, fuel pump relay (less likely), or one or more of the ignition coils (even less likely); the following are from the FSM, and I've followed fuse #11 to the items I have listed above. It has to be something w/ the UTEC since that's the one thing that was modified in your FXT; either the ECU has some type of internal damage (and some internal current draw is causing the popped fuses) OR there is a power wire that is grounding out causing an increased current draw OR the UTEC is installed incorrectly. Where is the UTEC getting its power from? __________________ - sonny 97 200sx - SR20DET 05 FXT - AP2 Last edited by gandapanda : 11-25-2008 at 06:50 PM.

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11-21-2008, 09:34 AM	#2 (permalink)
Integrity Performance Supporting Vendor Join Date: Jul 2007 Location: Austin TX Posts: 1,916 Gallery: 0 iTrader: 19 / 100%	I cant possibly see it being the UTEC, I am thinking its some other electrical gremlin, because of the fuse blowing. Remove the UTEC and drive it around a little while, it wont pop just driving it for enough time to figure out if the problem will happen or not. If it doesnt happen, then its the UTEC, if it does, then its not the UTEC. But I cant see how the UTEC could blow ign fuses. Especially since the maf circuit is separate from the ign to begin with. I dont even think its a MAF problem. Possibly a main body ground issue? I dont know where it is on our cars, probably up under the dash bolted to the side pillar or somewhere. Find it and make sure its ok?