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Author Topic: C305-Ectomy (Lots of pics)  (Read 100148 times)
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ktntek
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« Reply #60 on: February 27, 2010, 10:24:01 PM »

I guess I should clarifiy.......the Teks were not the only vehicle to have the C305 corrosion problem.  Buick Rendezvous & Terraza, Chevrolet Venture & Uplander, Olds Silhouette, Pontiac Montana, and Saturn Relay of years 2000 to 2007 were affected by the wonders this GM engineering.  I found it amazing that GM knew they had a problem but did nothing to change the design/engineering,  just add the next model year to the list of models with the problem.  The lastest TSB I could find was Bulletin No.: 01-08-45-005E dated Aug. 29, 2006.
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tanktek
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« Reply #61 on: February 28, 2010, 09:23:08 AM »

Im probly 90 percent sure that my mother in laws tek needs this done to it. Heres her symptoms.

SES light on
Gas gage acting flaky. It goes from full to empty all the time. She just keeps it full.
Evap code
Oil pressure leak code
ignition sometimes doesnt want to crank over

Sounds like we get to do a 305ectomy whether we want to or not. What fun. :no:
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Elisha  2005/06/07 Rally organizer
Proud owner of the Aztek General lee ,full decal set and dixie horn, fully loaded AWD, AFC banner on back glass, line of fire third tailgate light, custom painted dash/ door panels/engine cover, westin push bar, hood scoops ,and cold air intake
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owned 3 Azteks since 2002
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ztheg1
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« Reply #62 on: March 10, 2010, 06:14:03 PM »

Did this to my tek today.  It fixed my gas gauge problem, sweeeet!

Any reason to think this might fix a misfire issue too?

~Zack
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Python
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« Reply #63 on: March 25, 2010, 11:24:14 PM »

Hmm my gas gauge is acting strange since my last fill-up ... I've driven about 200km since the fill-up and according to the gauge I've only used 1/8 of my gas.  There is no way that's accurate...  Something funky going on.  Could a funky fuel gauge be a C-305 symptom?
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Formerly Owned: 2003 Pontiac Aztek FWD -- Sunroof, Bug Deflector, Tinted Windows, Power Seats, Premium Audio, 17" Alloys, Cargo Tray, All interior and most exterior halogen bulbs converted to LED, Silverstar Lowbeams and Highbeams, 3000k HID Fog Light Conversion, Tinted Plate Cover, Aztek Banner on Windshield, AFC Logo on Rear Hatch.
The Red Baron
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« Reply #64 on: March 26, 2010, 01:20:26 PM »

Traction, ABS, and Airbag lights are on. Is that C-305?
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Python
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« Reply #65 on: March 26, 2010, 09:09:36 PM »

Traction, ABS, and Airbag lights are on. Is that C-305?
Very well could be.  I know I will attempt to tackle the C-305 this summer just so I can have some ease of mind!

And as for my gas gauge ... all of a sudden it seems to be working?  I went over to Niagara Falls, NY today and it seemed to be going down as usual.  I filled it up when it got under the 1/2 mark though just to be on the safe side, drove back home, and it seems to be going down in a normal fashion.  Weird, maybe changing that fuel filter REALLY helped my mileage!!  Shocked
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Formerly Owned: 2003 Pontiac Aztek FWD -- Sunroof, Bug Deflector, Tinted Windows, Power Seats, Premium Audio, 17" Alloys, Cargo Tray, All interior and most exterior halogen bulbs converted to LED, Silverstar Lowbeams and Highbeams, 3000k HID Fog Light Conversion, Tinted Plate Cover, Aztek Banner on Windshield, AFC Logo on Rear Hatch.
alchemist
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« Reply #66 on: April 10, 2010, 04:32:29 PM »

Traction, ABS, and Airbag lights are on. Is that C-305?

Sorry I haven't been on in a while to respond.  Been having some health problems and have not been very active lately.

The traction and ABS lights, most likely.  The Airbag light, probably not...  But there is a small possibility.  The C-305 connector routes connections for wheel speed sensors which are part of the ABS and Traction Control systems, fuel gauge, fuel pump power, and other signals and controls related to AWD.

Now, that being said, keep in mind that these signals connect back to the computer.  If there's a broken connection, or worse, a short between two of the connections that feed power into a line that is not supposed to carry power, there is no telling how the computer might react.  I would like to think that the computer is robust enough not to throw unrelated codes, but stranger things have happened.

ztheg1: This goes for the misfire as well.  If you're having cylinder misfires, then you need to have your LIM gasket and ignition system checked out.

tanktek:  Oil pressure leak code is most likely not related to C-305.  It'd say that is more likely LIM or the oil pressure sensor that sits under the left lip of the LIM behind the water pump.
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If you can't fix it yourself, redesign it since it was obviously poorly designed to begin with, otherwise you could fix it yourself.  Right?
Bill Salina
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« Reply #67 on: May 04, 2010, 10:17:29 AM »

Great post and an awesome thread.  This is just what I was looking for.

My 2003 Tek ("The Warthog") has developed the always full fuel gauge problem.  It's gotten worse over time.  Initially it would happen when it was near empty, now it happens when I get below about 3/4 of a tank.

I'm planning to do the C305-Ectomy this weekend.  I might pull it apart before that to make sure I have everything I need (shrink tubing, tape, etc).

Thanks again for the great post and all the pictures!

Bill
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Bill (aka Bird Dog)
2003 Gold FWD Aztek "The Warthog"
Bill Salina
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« Reply #68 on: May 06, 2010, 08:27:27 AM »

Found the text of the Service Bulletin on Car Talk, thought it would be a good idea to post it here:

Bulletin No.: 01-08-45-005E

Date: August 29, 2006

TECHNICAL

Subject:
Hard/No Start, Fuel Gauge Inoperative/Fluctuates, SES/Check Engine Light On, ABS Warning Light On, TCS Warning Light On, TCS Activation, Service Traction System Message Displayed, All-Wheel Drive Disable Message Displayed, DTCs Set (Repair Connector)

Models:
2002-2006 Buick Rendezvous
2005-2007 Buick Terraza
2000-2005 Chevrolet Venture
2005-2007 Chevrolet Uplander
2000-2004 Oldsmobile Silhouette
2000-2005 Pontiac Montana
2001-2005 Pontiac Aztek
2005-2007 Pontiac Montana SV6
2005-2007 Saturn Relay

Supercede:

This bulletin is being revised to add 2007 model year. Also, additional information was added to the Important statement. Please discard Corporate Bulletin Number 01-08-45-005D (Section 8 - Body and Accessories).

Condition

Some customers may comment on one or more of the following conditions:

Engine is hard to start

Engine will not start

Engine starts then stalls

Fuel gauge is inoperative or fluctuates

Service Engine Soon/Check Engine light is illuminated

ABS Warning Light is illuminated

TCS Warning Light is illuminated

TCS activation

Service Traction System message displayed

All-Wheel Drive Disable message displayed

These conditions may be intermittent. Upon investigation, the technician may find various DTCs set.

Cause

This condition may be due to water leaking into the interior of the vehicle, and/or spread terminals, at connector C305 that is located on the floor to the rear of the driver's seat. This connector is not sealed from the inside of the vehicle and water may enter the connector causing the terminals to become corroded. Also, the female terminals of the connector may have become spread apart causing an intermittent poor connection.

Correction

Inspect the terminals at connector C305 for corrosion or spreading before replacing the fuel module or resistor card kit. Terminals can be accessed from underneath the vehicle.

Do not attempt to repair any spread female terminals as this will result in a return repair. The female terminal must be replaced.

If the terminals show signs of corrosion, determine the source of the water leak first and repair the water leak before repairing the terminals in connector C305. Refer to Corporate Service Bulletin Number 01-01-38-009A to determine a potential source for water in the vehicle interior.

Repair any corroded and/or spread female terminals in connector C305. Refer to Repairing Connector Terminals in the Wiring Systems sub-section of the appropriate service information.

Warranty Information







For vehicles repaired under warranty, use the table.

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Bill (aka Bird Dog)
2003 Gold FWD Aztek "The Warthog"
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« Reply #69 on: May 09, 2010, 01:12:56 AM »

Last time I was at the dealer, they indicated that the C305 was going south. Right now it only has a extended start problem. I will probly just let it ride for the moment. C305 Connector replacement is in my future thou. But I do have an idea...
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Brian - Carpe Diem

01 Pontiac Aztek GT OPT AWD 121k - 04 GMC Envoy XUV 182k - 05 Mercury Montego Premier AWD 52k (wrecked)

Python
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« Reply #70 on: May 23, 2010, 08:30:41 PM »

Heh, would you believe this ...

I went out and bought everything I needed to perform this, and was planning to do it tomorrow.  I took off some of the panels holding down the carpet to try and take a peak at it, and sure enough ... I think somebodys already fixed the darn thing.  Looks like the entire thing is taped up real good under there, the connector compartment, the wires, everything.  Crazyness.

Oh well, I got my reciept, back to LowesI go!
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Formerly Owned: 2003 Pontiac Aztek FWD -- Sunroof, Bug Deflector, Tinted Windows, Power Seats, Premium Audio, 17" Alloys, Cargo Tray, All interior and most exterior halogen bulbs converted to LED, Silverstar Lowbeams and Highbeams, 3000k HID Fog Light Conversion, Tinted Plate Cover, Aztek Banner on Windshield, AFC Logo on Rear Hatch.
LorneH
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« Reply #71 on: May 23, 2010, 08:44:55 PM »

The Safety Bulletin is priceless:

Cause

This condition may be due to water leaking into the interior of the vehicle, and/or spread terminals, at connector C305 that is located on the floor to the rear of the driver's seat. This connector is not sealed from the inside of the vehicle and water may enter the connector causing the terminals to become corroded. Also, the female terminals of the connector may have become spread apart causing an intermittent poor connection.

Not sealed from the inside of the cab - guess steamcleaning every 4-5 months wasn't so good an idea. It would appear I will be removing and bypassing the C305.
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Python
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« Reply #72 on: May 23, 2010, 08:59:37 PM »

The Safety Bulletin is priceless:

Cause

This condition may be due to water leaking into the interior of the vehicle, and/or spread terminals, at connector C305 that is located on the floor to the rear of the driver's seat. This connector is not sealed from the inside of the vehicle and water may enter the connector causing the terminals to become corroded. Also, the female terminals of the connector may have become spread apart causing an intermittent poor connection.

Not sealed from the inside of the cab - guess steamcleaning every 4-5 months wasn't so good an idea. It would appear I will be removing and bypassing the C305.
Lmfao ... your post made me laugh.  Stupid design indeed.
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Formerly Owned: 2003 Pontiac Aztek FWD -- Sunroof, Bug Deflector, Tinted Windows, Power Seats, Premium Audio, 17" Alloys, Cargo Tray, All interior and most exterior halogen bulbs converted to LED, Silverstar Lowbeams and Highbeams, 3000k HID Fog Light Conversion, Tinted Plate Cover, Aztek Banner on Windshield, AFC Logo on Rear Hatch.
The Red Baron
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« Reply #73 on: May 23, 2010, 09:27:45 PM »

how does the back seat come out? and I just cut the wires from the harness and solder them together? should I disconnect the battery first?
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Python
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« Reply #74 on: May 23, 2010, 09:42:51 PM »

how does the back seat come out? and I just cut the wires from the harness and solder them together? should I disconnect the battery first?
You don't need to remove the rear seat do you?  Either way, just flip it forward all the way then pull up, it should come right out if I remember correctly.

Might be a good idea to disconnect the battery, because you never know.  Cut or pull out or whatever you feel like doing, doesn't really matter, as long as you have a wire on each end to solder together that are the same color Wink .
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Formerly Owned: 2003 Pontiac Aztek FWD -- Sunroof, Bug Deflector, Tinted Windows, Power Seats, Premium Audio, 17" Alloys, Cargo Tray, All interior and most exterior halogen bulbs converted to LED, Silverstar Lowbeams and Highbeams, 3000k HID Fog Light Conversion, Tinted Plate Cover, Aztek Banner on Windshield, AFC Logo on Rear Hatch.
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