2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

taylork4r
Posts: 7
Joined: Thu Mar 16, 2017 2:19 pm
Vehicle: 09 Hyundai Accent GS

2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby taylork4r » Thu Mar 16, 2017 3:11 pm

2009 Hyundai Accent GS - 110,000 mi - 5spd manual

Have had codes p0451 and p0496 for the past 10k miles, have replaced gas cap with OEM and FTPS and PCSV and CCV. Codes always come back after DTC clear. I have checked all rubber lines and they are all 100% intact as I have replaced them all.

Today I am driving home and the light comes back on (expected after 20 miles or so after a clear) and as always I plug my OBDII reader in and I get NO p0451 and NO p0496 instead I get a p0132 and a p0328. I have been hearing the "clicking" noise everyone talks about in these 1.6L motors and as I said I have replaced the notorious PCSV valve and all the emission components.

My question is, has this just been a failing o2 sensor for the past 10k miles and now the PCM sees that that is the real problem and is holding off on the EVAP codes? Do I replace the o2 sensor and see if the knock sensor code goes away? Will that keep the EVAP codes away?

I understand what the code definitions mean, I just do not have more diagnostic abilities and was wondering if anyone has ran into this problem before. Any help is much appreciated, I am a student in college (with limited finds) and need my car to get me to and from school here in Miami, preferably without a MIL light on.

Quick note, the vehicle in question was a Illinois vehicle for the first 3 years of its life, now it is in the Florida sun (do not know if heat or cold is playing a factor in this issue).

Will put my email on here as I am really in need of any insight. Thanks for reading!!

[email protected]


cj1
Posts: 531
Joined: Fri Jan 24, 2014 5:37 pm

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby cj1 » Thu Mar 16, 2017 6:10 pm

Can you post fuel trims/O2 sensor voltage/freeze frame data?
Best to try a diagnoses to save on replacement parts.

taylork4r
Posts: 7
Joined: Thu Mar 16, 2017 2:19 pm
Vehicle: 09 Hyundai Accent GS

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby taylork4r » Mon Mar 20, 2017 6:47 am

Attached is in city driving, under load at start and the rest is leveling out on the throttle, I was unable to capture the short fuel trim as my obd adapter is "faulty" in the torque app.

Any help is greatly appreciated! Thanks in advance! Let me know if there is anything else I can get you, I can try a different scanner to retrieve the fuel trim data later today.
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cj1
Posts: 531
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Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby cj1 » Mon Mar 20, 2017 10:02 am

O2 sensors look to be switching correctly. Not the cause of a P0132 at that point.

P0132 freeze frame data?
Post Lt/St fuel trims taken at idle and at 3000 RPMs/under load for at least 30 sec.

P0496 freeze frame data?
Take a look at the trouble codes this forum. There are a couple of specific Hyundai causes for P0496.

taylork4r
Posts: 7
Joined: Thu Mar 16, 2017 2:19 pm
Vehicle: 09 Hyundai Accent GS

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby taylork4r » Wed Mar 22, 2017 4:58 pm

Okay so all the other 4 codes are all pending. The only code I have as "set" is p0446 and I am able to attach the freeze frame data, maybe this will help with the diagnosis.

Also had a p0172 (system too rich) pending code show up...

If any of the other codes set in the next couple drives I will post freeze frame data.

Isn't this kind of odd that there are so many codes and the vehicle is still running ok? electrical??
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cj1
Posts: 531
Joined: Fri Jan 24, 2014 5:37 pm

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby cj1 » Thu Mar 23, 2017 9:34 am

The P0451/P0496/P0446 are related and may not cause driveability issue.

Since P0446 is set, test the vent valve circuit for proper operation.
BBBind.com has electrical schematics.
You have already changed the canister vent valve correct?

These evap codes can all relate to a leak in the evap system.
If associated valves/circuits check out then have a shop do a smoke test to determine if there is a leak in the connecting hoses. Difficult to find without smoke test.

taylork4r
Posts: 7
Joined: Thu Mar 16, 2017 2:19 pm
Vehicle: 09 Hyundai Accent GS

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby taylork4r » Thu Mar 23, 2017 2:14 pm

Excellent thank you will do a ohm test or volt test on the entire circuit. Will post if I find anything odd.

Here is the SFT that was requested. 3k RPM at steady throttle.

Also important note car is having big difficulty starting after refueling any amount filled car dies a couple times and idle erratic if I rev to recover it stays revving after I release throttle for a couple seconds, then runs perfectly fine....It's very strange.
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cj1
Posts: 531
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Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby cj1 » Thu Mar 23, 2017 4:54 pm

"Also had a p0172 (system too rich) pending code show up..."
If this code is being set when you have difficulty starting after fueling could be engine
receiving excess fuel from evap canister thru the purge valve.

First fix the P0446 since its a more clear cut problem.
Fuel trims appear normal at 3k RPMs.

taylork4r
Posts: 7
Joined: Thu Mar 16, 2017 2:19 pm
Vehicle: 09 Hyundai Accent GS

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby taylork4r » Tue Mar 28, 2017 5:39 pm

I found the problem...at least I think.

The PCSV valve behind the throttle body tested good on ohms, the connector did not test proper for voltage....I investigated from there...

Upon removing the intake assembly and connector for PCSV, I noticed the typical oil seepage from the throttle body that tends to occur on high mileage vehicles. An important note is that it seeps directly on the PCSV connector harness and the harness faces the 'up' position plugged in. I took a cotton swab and pushed lightly into the male connector (on the car wiring harness) and it came back with oil on it...from there I took another new cotton swab and used ISP to clean the connector and the prongs on the PCSV valve. Also the wire was chaffed directly where it runs under the throttle body on the top side, re-taped the exposed wire and after reassebly, and multiple run cycles, the code has disappeared. I refueled at a gas station about half a tank, and the car started immediately without pause and in general is running a lot smoother, especially at low RPMs. I hope that my discovery has been helpful, happy it didnt cost me a penny to fix also! Thanks for your help cj1

taylork4r
Posts: 7
Joined: Thu Mar 16, 2017 2:19 pm
Vehicle: 09 Hyundai Accent GS

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby taylork4r » Thu Mar 30, 2017 8:22 am

UPDATE:

Codes are back. Just posting freeze frame data to see if there is anything odd seen here. It is going to mechanic this weekend, will post results and issues after the weekend...about done with these Hyundai issues, time for an American car soon.

Read Codes
P0451
$07EF Generic
Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0496
$07EF Generic
Evaporative Emission System High Purge Flow


Pending Codes
P0496
$07EF Generic
Evaporative Emission System High Purge Flow


View Freeze Frame
DTCFRZF() P0451
FUELSYS1() CL
FUELSYS2() --
LOAD_PCT(%) 38.8
ECT(¡£F) 321
SHRTFT1(%) -4.7
LONGFT1(%) 1.6
MAP(psi) 1.0
RPM(rpm) 2393
VSS(mph) 28
SPARKADV(¡£) 35.0
IAT(¡£F) 170
TP(%) 14.1
RUNTM(sec) 171
EVAP_PCT(%) 100.0
FLI(%) 73.7
BARO(psi) 2.1
VPWR(V) 14.159
LOAD_ABS(%) 36.9
EQ_RAT () 0.999
TP_R(%) 7.1
AAT(¡£F) 163

If anyone sees anything here that could point to a problem, please let me know, much thanks!

cj1
Posts: 531
Joined: Fri Jan 24, 2014 5:37 pm

Re: 2009 Hyundai Accent a ton of MIL codes p0451 p0496 p0328 p0132

Postby cj1 » Thu Mar 30, 2017 11:22 am

Yes, time for a on site diagnosis. You may want to discuss, before work begins, what assurance/warranty the mechanic is willing to give that his diagnosis/repair will be accurate the first time. An auto diagnostic/electric shop is your best bet.

Comeback work for same codes should be covered under warranty.


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