Just purchased this vehicle, I have a 97 integra gsr with a 99 Integra gsr motor. I have code 41 and 91. Code 41: I'm missing the primary 02 sensor. But for code, 91 Fuel Tank Pressure Circuit, anyone have the resolution to this problem? I want to get it smog, but having a hard time due to this code. Please help

 

How are you missing the primary O2 sensor? As in it isnt there at all? The **** people do to these cars never ceases to amaze me. Fix the O2 sensor issue..apparently just installing one should solve that problem. Clear the codes, drive it and see if code 91 comes back. It may for some wild *** reason be related to not having a primary O2 sensor at all.

Fuel tank pressure circuit...maybe needs a new fuel cap. Just a guess though.

 

Long story short, someone stole my EG6 with an Swapped. I got it back stripped, therefore I fair traded it for a 97 GSR which I know that it have codes. I wasn't too worry anyways, where I was just making sure the engine is good. My plan is to swap it the engine in another car. Until I find one, I need to fix the problem for DD.

I jumped the pins and read code 41 & 91. I went under noticing the 02 sensor is missing. I just received the 02 sensors which I putting on tomorrow. But code 91, I found a lot of info on gsr swapped in EK, but never got a problem with being an 98 engine swapped in 97 GSR.

I read that from 98-00 gsr ecu looks for FTP but 97 doesn't. Wonder is it the ECU? Any confirmation will be good

 

yes you need a 96-97 ecu.

 

Where can I get one for cheap around bay area?

 

You should try your local PicknPull... 590 Computer Brain Box Car $48.99 + $4.99 core.

Never heard of Da Town California, so no idea what the closest PicknPull is to you.

There are a number of PicknPulls in the "Bay Area"... http://www.picknpull.com/check_inven...ra&Distance=50 94

 

I just came back from Pick N Pull... I have no luck for an ECU, but I happened to pick up a lot of items for my SC400 which I was happy with. Anyways, no ECU at all... Probably a couple of civic EGs and there was one dc2

590 Computer Brain Box Car $48.99 + $4.99 core ?

Bay Area

 

590 Computer Brain Box Car $48.99 + $4.99 core ?= part# code and price of an ECU/ECM at PicknPull as per their price list.

What PicknPull did you go to, there are 7 of them in the "Bay Area". 94

 

I went to the one in Oakland. I found one in San Jose for $60 and I have read info on the forums about ECU codes. But how do you tell the difference from an OBD2 97 ECU and a 98 ECU. The ECU i have in the car is 37820-p72-a03.. And the one he have is the same. I just want to confirm that my ECU in my car is what I assume it is off a 99 ECU, but it's the same code he have on his ECU.

 

http://www.hondata.com/techecuid.html 94

 

DTC Code:

P0091

Fuel Pressure Regulator 1 Control Circuit Low


1.Sensor or solenoid faulty
2.Connector terminal contact is damaged or corroded
3.Wire harness - Check harness for correct voltage, open, short to ground or short to voltage
4.Update control unit software - Check for the latest control unit update
5.Powertrain or Engine Control Module faulty
6.Fuel pressure - Pump, regulator, filter or lines

This info comes from Auto Repair Reference Center (ARRC) is the most comprehensive collection of automobile repair reference information and contains repair and maintenance information on most major manufacturers of domestic and imported vehicles. New repair procedures, TSBs and updates are added to the product on a regular basis.

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Quick Tips (a complete guide to vehicle ownership & maintenance)


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Diagnostic information

 

I have read that ecu ID numerous of times. But does not tell me is the last digits A03 for 97 or 98

 

The A03 is from a 97 and does not look for the fuel tank pressure. An A04 will look for the pressure sensor and throw a code.

You can use an A03 ('97) or A02 ('96).

 

Anyone have the guide to do potentiometer trick where I can just get it pass smog. I'm tired of this guy flaking on me where I can't get my ECU. I read the ff-squads:


http://technet.ff-squad.com/code91.htm

I have been searching for someone with picture write up where I can get this bypass. At least till I get a 97 ecu and get it smog. Please let me know. Please hyperlink me to someone who's doing a write up. Thanks

 

anyone?

 

i'm not seeing a problem here. the article is pretty descriptive. just buy the potentiometer listed, quick splice it to ecm vref and ground, then adjust the pot to 2.5v and run the signal to the ecm pin that is anticipating it. pretty straight forward, bud.
not trying to be an ***, but,IMO, you're quite lucky enough to have the article alone

 

http://technet.ff-squad.com/code91.htm

 

if problem persists.... suggested fix "3" is a cheap easy quick guarantee

 

a potentiometer isnt a trick... its used to change resistance to a desired level to have a controlled output voltage level you want. think back to old slotcar racetracks. the control gun is a potentiometer you can see to understand them. its a its a tight wound coil with a wire attached to one end. and a wiper attached to the other wire... As the wiper is drug across the coil it gets further awsay from the other wire and the coil is a resistive load and draws amps which in turn lowers votage. its a type of switch, but instead of on of it can be used as a speed control or in this application just to lower voltage. in the case of cel 91 its used to get 2.5 exactly to fool the ecu that your evap system is in a satisfied range

 

instead of it being an on/off switch it has infinite positions kinda... The reason the slot car speeds up and slows down is because of the increase and decrease in output voltage via the potentiometer. so get you ecu pinout handy and follow catmans simple instrucitons and fix your prob

 

your*

 

i was just trying to help bro... i couldve walked you through the whole thing... i have way more experience then youd ever believe...

 

don't worry, my friend. i believe the ignorant comment was aimed toward me.
you've been here for over 3 years, yet only a handful of posts. very descriptive ones as well. we need more intelligent posters like yourself, offering descriptive, solid information

 

oh word... thanks mayne. yea, i dont go on here much. more of a find the problem myself kind of guy... people spend more time searching the damn web then searching for the problem themselves. in they time they spend on the web you can find most probs guaranteed haha. That thread explained what he needed to do perfectly

 

im retarded when it comes to this $%&# though... how/can I add pics to my profile?