need help p28 ecu h22 question
#1
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
need help p28 ecu h22 question
well recently i have been havin problem with my car when it frist starts up it will get one good start on the p28 ecu but try to cut off unless i keep my foot on the gas until it warms up. if it cut off befor it warms up it will not start at until i swap ecus. it only seems to do this with p28 ecu on my h22a swap. i have tried both a jun chipped p28
and a stock p28.
i took the ecus apart and found both p28 had burned the same thing on both boards heres a pic
chipped p28
stock p28
it looks like what ever it was exploded not sure tho but if im correct its connected to the a17 pin which i think is IAB soleniod (what ever that is)
but what i am trying to figure out is why its is doing this and can i fix it some how i have had a jdm p13 ecu but removed it because the fuel cut at 120mph
correction i just look at me ecus and relized my chipped ecu has the same circut board numbers as my stock p06 so my chipped ecu that i was told is a p28 is a p06 chipped
please help me
and a stock p28.
i took the ecus apart and found both p28 had burned the same thing on both boards heres a pic
chipped p28
stock p28
it looks like what ever it was exploded not sure tho but if im correct its connected to the a17 pin which i think is IAB soleniod (what ever that is)
but what i am trying to figure out is why its is doing this and can i fix it some how i have had a jdm p13 ecu but removed it because the fuel cut at 120mph
correction i just look at me ecus and relized my chipped ecu has the same circut board numbers as my stock p06 so my chipped ecu that i was told is a p28 is a p06 chipped
please help me
Last edited by jays01; 02-05-2009 at 12:43 PM.
#2
Honda-Tech Member
Join Date: Sep 2002
Location: Portland, Or, US
Posts: 1,953
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
It can be replaced if the board is not messed up just desolder and resolder a new one I believe xenocron sells them. Very common to find this issue.
http://www.xenocron.com/xenocron-q31...tor-p-335.html
http://www.xenocron.com/xenocron-q31...tor-p-335.html
#3
Junior Member
Join Date: Feb 2004
Location: Hamilton, ON, Canada
Posts: 551
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
you must have your IAT sensor's plug switched up with something else (the EVAP, IACV) b/c i've seen a few ecus now burn up that q31 transistor and the cause was switching the IAT sensor's plug. I'd also pull the IAT sensor out and check to see if its burned up too.
As long as the traces didn't get burned up from the transistor frying you should be able to fix those ecus, i've fixed a few myself over the years.
As long as the traces didn't get burned up from the transistor frying you should be able to fix those ecus, i've fixed a few myself over the years.
#4
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
you must have your IAT sensor's plug switched up with something else (the EVAP, IACV) b/c i've seen a few ecus now burn up that q31 transistor and the cause was switching the IAT sensor's plug. I'd also pull the IAT sensor out and check to see if its burned up too.
As long as the traces didn't get burned up from the transistor frying you should be able to fix those ecus, i've fixed a few myself over the years.
As long as the traces didn't get burned up from the transistor frying you should be able to fix those ecus, i've fixed a few myself over the years.
what is the iat? and what pin is it? also can this prevent my car from starting?
#5
iTrader: (2)
Re: need help p28 ecu h22 question
The iat is the intake air temperature sensor. It usually won't cause a vehicle not to start.
Concerning the pinouts, check http://www.phearable.net/tech
Concerning the pinouts, check http://www.phearable.net/tech
#6
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
well my problem is my car will get like one good start and then just cranks lil it not getting fuel or spark but it is. if i heat up the ecu with a heater it will start fine and it will also start right up it i drive the car and cut it off and try to start it. a while back it used to cut off while driving when i push the clutch in if the car wasnt warrmed up yet. all i know is i replace the resister turned the car on started fine then stalled ather 5 secs and the resister burned up
#7
moderator emeritus
Re: need help p28 ecu h22 question
well my problem is my car will get like one good start and then just cranks lil it not getting fuel or spark but it is. if i heat up the ecu with a heater it will start fine and it will also start right up it i drive the car and cut it off and try to start it. a while back it used to cut off while driving when i push the clutch in if the car wasnt warrmed up yet. all i know is i replace the resister turned the car on started fine then stalled ather 5 secs and the resister burned up
also, running a basemap doesnt help things.
Trending Topics
#8
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
#9
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
i just ordered some of these
http://www.xenocron.com/xenocron-q31...tor-p-335.html
and its say in the discription
Transistor for Honda ECU spots labeled Q34 or Q31
Q31 is the transistor that commonly blows up when someone plugs the Purge Control Solenoid plug into the IAT sensor.
can anyone tell me were the purge control soleniod and the i IAT sensor are
http://www.xenocron.com/xenocron-q31...tor-p-335.html
and its say in the discription
Transistor for Honda ECU spots labeled Q34 or Q31
Q31 is the transistor that commonly blows up when someone plugs the Purge Control Solenoid plug into the IAT sensor.
can anyone tell me were the purge control soleniod and the i IAT sensor are
#10
moderator emeritus
Re: need help p28 ecu h22 question
www.ff-squad.com
http://technet.ff-squad.com/wiring.obd1.htm
#11
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
thanks for the help im ganna try to move some plugs does any one know what colors the wires are for the
IAT
IAB
EVAP
IACV
IAT
IAB
EVAP
IACV
#13
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
yes i did check both of them but its only tellms me the colors at the ecu plug i was reffering to the sensores them selfs
#15
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
i wasnt sure if the did plus the sensor have 2 wires i only see one of the wires on the ecu. i was asking the plug wire colors so i could make sure the plugs were correct spots
#19
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
i think i may have something pluged wrong but not sure, so i took some pics to help explian.
IAT wires RED / YELLOW-black stripe
IACV Black- Blue stripe / YELLOW- black stripe
----(the other valve shown in the pic not sure what it is, i think it intake purge) RED-white stripe / GREEN- white stripe
and then the thing mounted to the box under the intake manifold
WHITE-ish wire/ BLack wire
can anybody confirm is this is right or wrong and if its wrong where to they go to make them right.
IAT wires RED / YELLOW-black stripe
IACV Black- Blue stripe / YELLOW- black stripe
----(the other valve shown in the pic not sure what it is, i think it intake purge) RED-white stripe / GREEN- white stripe
and then the thing mounted to the box under the intake manifold
WHITE-ish wire/ BLack wire
can anybody confirm is this is right or wrong and if its wrong where to they go to make them right.
#21
Honda-Tech Member
Thread Starter
Join Date: Mar 2005
Location: Rva
Posts: 479
Likes: 0
Received 0 Likes
on
0 Posts
#22
Honda-Tech Member
Join Date: Mar 2007
Location: suffolk
Posts: 1,776
Likes: 0
Received 0 Likes
on
0 Posts
Re: need help p28 ecu h22 question
im also have the same problem
p28 chipped gsr map
b18c with bolt ons
motor runs and hits vtec
vtec is at 4800/4900
should be at 5185
2step 4k
blown transistor must of messed up my settings?
the blown transistor is in the R135
p28 chipped gsr map
b18c with bolt ons
motor runs and hits vtec
vtec is at 4800/4900
should be at 5185
2step 4k
blown transistor must of messed up my settings?
the blown transistor is in the R135
Thread
Thread Starter
Forum
Replies
Last Post