P0306, P1175

[WoodburyMan]

This isn't for my car.. it's actually Marc's 2008 Aura w/ the 3.5L.....

Story goes he filled up at a full service station Saturday night. A little while later the car gets a CEL... and is running really rough and shaking. (I turned it on and checked it out this morning and the car is in "limp home mode". Well, he drove it back and forth to the airport yesterday (about 100 mile roundtrip) and afterwards Service ESC and TC indicators came on.... I ran my DashHawk on it this morning, and get P0306 Cylinder 6 Misfire Detected, and P1175 (Unknown??). I googled P1175 and it generally said issue with Fuel Injector...possibley something with Cam Control Fault????

Go to work boys! What could it be? Any clarification on P1175 would help. I checked spark plug wires, those are fine... I however cannot see the fuel injector wiring or anything without ripping anything apart. A few months ago I had a problem where a rodent chewed through the fuel injector wiring harness which caused issues with Cylinder #4 and the same misfire thing.

Is it safe for him to drive? He has an appointment Thursday with the dealership already... might try to expedite by calling and saying its misfiring...

[ragingfish]

Re: P0306, P1175

My service manual doesn't even show a P1175.

[WoodburyMan]

Re: P0306, P1175

Oh. The reason I mentioned the gas thing to is the possibility of bad gas or something.. not sure if it could cause that.

Likewise... I did not clear the code with my DashHawk... left it in there.

[ragingfish]

Re: P0306, P1175

Oh. The reason I mentioned the gas thing to is the possibility of bad gas or something.. not sure if it could cause that.

Likewise... I did not clear the code with my DashHawk... left it in there.

Certainly bad gas would seem a sensible theory since this all developed shortly after refueling. Unfortunately, anti-siphoning features of our cars prevent him from trying to siphon out the suspected bad stuff and refueling.

Which 3.5 does he have? I wonder if these two codes only apply to the newer 3.5 because I can't find the 0306 in my manuals either.

[WoodburyMan]

Re: P0306, P1175

Same LZ4 3.5L as the 2007+ G6's.

[ragingfish]

Re: P0306, P1175

Hey woody, check out this thread on a GM truck forum...it might be relevant

http://www.gm-trucks.com/forums/lofiver ... 96129.html

Fuel System - Driveability Issues/MIL ON/DTC's Set

Bulletin No.: 03-06-04-030E

Date: June 12, 2007

TECHNICAL

Subject:
Various Driveability Symptoms Due to Clogged Fuel Injectors, MIL/SES DTCs P0171, P0172, P0174, P0300, P1174, P1175 (Clean Fuel Injectors and/or Perform Injector Test With AFIT - CH-47976)





Models

Supercede:

This bulletin is being revised to update the service information in step number 3 under Injector Cleaning Procedure and update the Warranty Information (excluding Saab U.S. Models). Please discard Corporate Bulletin Number 03-06-04-030D (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on any of the following various driveability symptoms:

Extended Crank Time

Hard to Start

MIL/SES Illuminated with DTCs

Hesitation

Lack of Power

Surge or Chuggle

Rough Idle

Light or Intermittent Misfire

Cause

Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms.

Correction

Fuel injector restrictions, deposits can be cleaned on the vehicle using the following procedure. Under NO circumstances should this procedure be modified, changed or shortened. As a long term solution, and to prevent reoccurrence, customers should be encouraged to use Top Tier Detergent Gasoline. For further information on Top Tier detergent gasoline and fuel retailers, please refer to the following Corporate Bulletin Numbers:

04-06-04-047G (U.S. Only)

05-06-04-022C (Canada ONLY)

GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent approved for use with General Motors fuel system components. Other injector cleaners may cause damage to plastics, plated metals or bearings. General Motors has completed extensive laboratory testing of GM Upper Engine and Fuel Injector Cleaner, and can assure its compatibility with General Motors fuel system components, as long as the cleaning procedure is followed correctly.

The following tools, or their equivalent, are required:

CH-47976 Active Fuel Injector Tester (AFIT)

J 35800-A Fuel Injector Cleaner

J 37287 Fuel Line Shut-off Adapter

J 42964 Fuel Line Shut-off Adapter

J 42873 Fuel Line Shut-off Adapter

* One bottle of GM Upper Engine and Fuel Injector Cleaner, P/N 88861802 (in Canada, P/N 88861804)

* One bottle of GM Fuel System Treatment Plus, P/N 88861011 (in Canada, P/N 88861012)

Some dealers may not have an Active Fuel Injector Tester (AFIT - CH-47976). Dealers can contact 1-800-GM-TOOLS (1-800-468-6657) to order an AFIT - CH-47976. Dealers still can test the fuel injectors without an AFIT. Refer to Fuel Injector Diagnosis (W/ J 39021 or Tech 2®) in SI.

As mentioned in the AFIT User Guide, vehicles that are not listed in the AFIT menu can still be tested with the AFIT. Depending on the model, it may be possible to enter the previous model year and proceed with testing using the DLC connection. If this is not possible on the model that you are working on, it will be necessary to use the direct connection method outlined in the AFIT User Guide (See Pages 17-31).

General Motors recommends that the Active Fuel Injector Tester (AFIT) be used in testing fuel injectors. If the SI diagnostics do not isolate a cause for this concern, use the Active Fuel Injector Tester (AFIT - CH-47976) to perform an Injector Test as outlined in the AFIT User Guide.

The AFIT Injector Test measures the flow characteristics of all fuel injectors, which is more precise when compared with the standard Tech 2® fuel injector balance test. As a result, the AFIT is more likely to isolate the cause of a P1174 DTC (for example: if it is being caused by a fuel injector concern).

The CH-47976 (Active Fuel Injector Tester - AFIT) can also be used to measure fuel pressure and fuel system leak down. Also, as mentioned in the P1174 SI diagnosis, if the misfire current counters or misfire graph indicate any misfires, it may be an indicator of the cylinder that is causing the concern. Refer to Fuel Injector Diagnosis (w/CH-47976) in SI for additional instructions.

To access the training video on AFIT, take the following path at the GM Training Website:

After logging into the gmtraining.com website, choose the link on the left side of the page titled web video library.

Then choose "technical".

Next, within the search box, type in September course number 10206.09D.

This will bring up a link with this course. Scroll through to choose feature topic."

At this point, the seminar can be chosen to view or the video related to the AFIT.

Additional training is available from the gmtraining.com website. Please see TECHassist 16044.18T2 Active Fuel Injector Tester and also see 16043.51D Engine Mechanical Diagnosis & Measurement for more information on GM Upper Engine and Fuel Injector Cleaner.

Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE) on the web at http://www.gmde.net/AFIT.cfm..

To access the training video on AFIT, take the following path at the GMPro LMS Training Website:

After logging into the website, choose the link on the left side of the page titled "Catalog."

Then choose "Catalog Search."

Next, within the search box, Select Course Number - Contains - "T" then select search.

This will bring up a list of TECHassist courses. Scroll through to choose "Active Fuel Injector Tester" and select "View."

At this point, a new window will open and the program can be Launched.

Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE) on the web at http://www.gmde.net/softwareupdates/.

Additional information can be found on AFIT (June 2006 Edition) and GM Upper Engine and Fuel Injector Cleaner (November 2006 Edition) in Techlink. To access the articles, take the following path:

Go to GM DealerWorld (U.S.) or the GM infoNET (Canada).

Click on the Service Tab in DealerWorld (GM infoNET for Canada).

Click on the GM Techlink Hyperlink.

Click on the Archives Hyperlink at GM Techlink.

Click on 06-2006 in the Archives Section and Click on the Active Fuel Injector Tester Link in the June 2006 Techlink Article.

Click on 11-2006 in the Archives Section and Click on the GM Top Engine Cleaner Replaced Link in the November 2006 Techlink Article.

GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent recommended. DO NOT USE OTHER CLEANING AGENTS AS THEY MAY CONTAIN METHANOL, WHICH CAN DAMAGE FUEL SYSTEM COMPONENTS. Under NO circumstances should the GM Upper Engine and Fuel Injector Cleaner be added to the vehicle fuel tank.

Do not exceed the recommended cleaning solution concentration. Testing has demonstrated that exceeding the recommended cleaning solution concentration does not improve the effectiveness of this procedure.

Vehicles with less than 160 km (100 mi) on the odometer should not have the injectors cleaned. These vehicles should have any out of specification injectors replaced.

For 4, 5 and 6 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A - Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) mixed with 420 ml (14 oz) of regular unleaded gasoline.

For 8 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A - Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline. This procedure will need to be repeated for a second time for an 8 cylinder engine (8 cylinder engines receive 960 ml total fluid - 120 ml (4 oz) of Upper Engine and Fuel Injector Cleaner and 840 ml (28 oz) of gasoline.

Be sure to follow all additional instructions provided with the tool.

Electrically disable the vehicle fuel pump by removing the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.

Turn the ignition to the OFF position.

Relieve fuel pressure and disconnect the fuel feed and return lines at the fuel rail. Plug the fuel feed and return lines coming off the fuel rail with J 37287, J 42873 or J 42964 as appropriate for the fuel system.

Connect the J 35800-A to the vehicle fuel rail.

Pressurize the J 35800-A to 510 kPa (75 psi).

Start and idle the engine until it stalls, due to lack of fuel. This should take approximately 15-20 minutes.

Turn the ignition to the OFF position.

Disconnect the J 35800-A from the fuel rail.

Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped.

Remove the J 37287, J 42873 or J 42964 and reconnect the vehicle fuel feed and return lines.

Start and idle the vehicle for an additional two minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines.

Pour the entire contents of GM Fuel System Treatment Plus (P/N 88861011 [in Canada, P/N 88861012]) into the tank and advise the customer to fill the tank.

Review the benefits of using Top Tier Detergent gasoline with the customer and recommend that they add a bottle of GM Fuel System Treatment Plus to the fuel tank at every oil change. Regular use of GM Fuel System Treatment Plus should keep the customer from having to repeat the injector cleaning procedure. Road test the vehicle to verify that the customer concern has been corrected.





Parts Information

Warranty Information (excluding Saab U.S. Models)





For vehicles repaired under warranty, use the table.

Warranty Information (Saab U.S. Models)








For vehicles repaired under warranty, use the table.








Injector Worksheet (Use with Tech2® Balance Test)





Disclaimer

[ragingfish]

Re: P0306, P1175

Woody, you may be able to use your dash hawk to test if it's a clogged injector or not (assuming it has the ability to report the data required):

Scan tools may also indicate fuel injector activity by indicating fuel injector operating status on a data screen, storing fuel injector trouble codes, or by retrieving long- and short-term fuel trim numbers from the PCM. Although interpreting fuel trim numbers requires specific training, negative fuel trim numbers generally exceeding 10% indicate that injector pulse width is being decreased to compensate for fuel supplied from an outside source, such as a leaking fuel pressure regulator.

Positive numbers exceeding 10% indicate that the PCM is increasing injector pulse width to compensate for the lack of fuel from clogged fuel injectors or from excess air supplied by an unmetered air source such as a vacuum leak. Unmetered air may also include air leaking into the intake duct on vehicles equipped with air flow sensors. Whatever the case, a scan tool can provide the fastest analysis of a cylinder misfire or poor fuel distribution condition.

[WoodburyMan]

Re: P0306, P1175

I can retrieve some fuel trim info and also reset the fuel trim with the DashHawk.

[ragingfish]

Re: P0306, P1175

I can retrieve some fuel trim info and also reset the fuel trim with the DashHawk.

Well then get to work biznitch!

[WoodburyMan]

Re: P0306, P1175

Just wondering if I should play with it. Resetting fuel trim and clearing the CEL codes would make it harder for the dealer to fix if it still has to go there.

[ragingfish]

Re: P0306, P1175

Just wondering if I should play with it. Resetting fuel trim and clearing the CEL codes would make it harder for the dealer to fix if it still has to go there.

I wouldn't change anything. Can't you just retrieve readings?

[WoodburyMan]

Re: P0306, P1175

Should be able to.

[Guest]

Re: P0306, P1175

Sounds like a tank of bad gas with some crap in it, maybe from the bottom of the tank at the gas station, and it clogged the injector for number 6 cylinder.

[WoodburyMan]

Re: P0306, P1175

Yea... thats what it looks like. They sell fuel injector clean stuff you just throw in the tank? Our store here is right literally next to Advanced Auto and Autozone is across the street. If they have it it's worth a shot. Throw some of that in and he's already used half the tank.. have him fill up with 91 octane or something and see how it goes.

[Guest]

Re: P0306, P1175

Try some SEA FOAM. That shit is amazing.