Jump to content



Photo
- - - - -

FPCM codes. Cuts out with moderate acceleration.


  • Please log in to reply
8 replies to this topic

#1 jacksl

jacksl

    Enthusiast

  • Newbie
  • 2 posts

Posted 22 November 2012 - 05:59 AM

This is the problem. When 3/4 to full throttle the truck seems to act as if its out of fuel. Cuts out and bucks and jerks. At easy throttle I can run it to 6000 rpm no problem. Any load or full throttle has issues. Finally got a CEL. P0191 (rail press circ voltage range) and P069e (FPCM Req MIL illum). Truck is 2007 silverado 4x4. 6.0l. 112k miles. Tuned 40k miles ago. Just now having issues. Not been to dealer yet... Any thoughts?

#2 doug_scott

doug_scott

    Senior Enthusiast

  • Member
  • 2,436 posts
  • Name:Doug Scott
  • Location:Ajax, ON
  • Gender:Male
  • Drives:2010 GMC SL Ext Cab 4.8

Posted 22 November 2012 - 11:14 AM

Fuel filter.

#3 aflesch

aflesch

    Enthusiast

  • Member
  • 227 posts
  • Name:Adam Flesch
  • Location:Somerset, WI
  • Gender:Male
  • Drives:09 Silverado Ext Cab Z71 4x4

Posted 22 November 2012 - 05:00 PM

Get a fuel pressure gauge on it to see if it really has low pressure or if it is just the sensor. The pressure regulator, filter, and pump are one unit so they all get replaced together.
Posted Image
`09 Silverado 1500 EXT Cab Z71 4x4 5.3L Flex (LMG) Victory Red
3.73 G80, 2" Level, Airaid MIT, K&N Drop-In
Dual Exhaust w/ Flowmaster 50 Series Delta Flow

#4 govtech4

govtech4

    Senior Enthusiast

  • Member
  • 4,876 posts
  • Name:Rob
  • Location:Alberta
  • Gender:Male

Posted 22 November 2012 - 08:20 PM

#09-06-04-022B: Malfunction Indicator Lamp (MIL) Illuminated, Intermittent DTC P0191, Slow Fuel Rail Pressure (FRP) Decay, Wiring Harness Connections, Voltage Fluctuations/Interruptions (Follow Correction Information - (Jan 28, 2010)


Posted Image

Subject: Malfunction Indicator Lamp (MIL) Illuminated, Intermittent DTC P0191, Slow Fuel Rail Pressure (FRP) Decay, Wiring Harness Connections, Voltage Fluctuations/Interruptions (Follow Correction Information Below)


Models: 2006–2009 Chevrolet Express, Kodiak, Silverado

2006–2009 GMC Savana, Sierra, TopKick

Equipped With Duramax™ Diesel Engine (RPOs LLY, LBZ, LMM)

Please Refer to GMVIS

This bulletin is being revised to update the reprogramming emission controller warranty coverage period information. Please discard Corporate Bulletin Number 09-06-04-022A (Section 06 — Engine/Propulsion System).
Condition


Some customers may comment that the malfunction indicator lamp (MIL) is illuminated, or it illuminates intermittently.
The technician may find DTC P0191 set as current or in history.

Causes


A slow fuel rail pressure (FRP) decay rate may exist, due to an accumulated but harmless varnish buildup on the fuel injectors.

The wiring harness connections may exhibit incorrect crimping, corrosion or poor terminal tension.

Aftermarket electrical equipment may be improperly installed on the vehicle resulting in an interruption or fluctuation in voltage to the engine control module (ECM).

The ECM monitors the FRP sensor voltage signal at engine start up. If the voltage signal is greater than (high fuel rail pressure) a calibrated amount DTC P0191 can set.

The ECM monitors the FRP sensor voltage signal at engine shut down , expecting a decrease to a low voltage signal (low fuel rail pressure) within a calibrated amount of time. If the voltage signal is greater than a specified value within that specific time period, DTC P0191 can set.


Correction


Verify the model year of the vehicle in order to determine which one or both of the following procedures to utilize.

For 2006-2008 Vehicles – Diagnose Possible Slow Fuel Rail Pressure Decay First

Important: DO NOT replace the ECM, the fuel rail pressure regulator, or the fuel rail pressure sensor for this condition.

1. Start and idle the engine.

2. Observe the Fuel Rail Pressure Sensor parameter with a scan tool. The parameter should be between 30-40 MPa, depending on engine coolant temperature (ECT).

3. Turn OFF the engine, and immediately turn the key to the ON position.

4. Using a stopwatch, observe the decay of the Fuel Rail Pressure Sensor parameter with a scan tool.

5. The Fuel Rail Pressure Sensor parameter should decay to less than 6.6 MPa within 15 seconds.

If the Fuel Rail Pressure Sensor parameter is more than the specified value within the specified time period, then reprogram the ECM.

Important: If a 2006-2007 LLY, LBZ vehicle has, as one of nine ECM module ID Part Numbers, Part Number 12632483, then reprogramming the ECM will not repair this condition. If a 2007i-2008 LMM vehicle had field action V1819 - 08142 ECM EEPROM - REPROGRAM ECM applied, then reprogramming the ECM will not repair this condition. All 2009 LMM's already have an extended rail pressure bleed down calibration.

A revised software calibration has been released to address this condition. Reprogram the ECM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB. Refer to the SPS procedures in SI.
When using a multiple diagnostic interface (MDI) for reprogramming, ensure that it is updated with the latest software version.
When using a Tech 2® for reprogramming, ensure that it is updated with the latest software version.
During programming, the battery voltage must be maintained within the proper range of 12-15 Volts. Only use the approved Midtronics® PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.

For 2006-2009 Vehicles – Use The Following Testing Procedures

Important: DO NOT replace the ECM, the fuel rail pressure regulator, or the fuel rail pressure sensor for this condition.

Wiring Harness Conditions
A secondary cause of DTC P0191 may result from a poor connection at the pigtail connector, or the engine harness connector, incorrect crimps, corrosion, and/or poor terminal tension.

1. Inspect the six-inch pigtail connector, which connects the FRP sensor to the main engine harness for incorrect crimps, corrosion, and/or poor terminal tension. Refer to Inline Harness Connector End Views for the appropriate model and year, and Circuit Testing and Wiring repairs in SI.

2. Inspect the Engine Chassis Harness to Engine Harness connector for incorrect crimps, corrosion, and/or poor terminal tension. Refer to Inline Harness Connector End Views for the appropriate model and year, and Circuit Testing and Wiring Repairs in SI.

Voltage Fluctuations/Interruptions at Key Up
Voltage fluctuations at key up, which false trigger a DTC P0191 can be very brief (less than 1 second) and may occur due to any aftermarket equipment installed on the vehicle.
Important: Aftermarket electrical equipment should have a diode connected across the power circuit (coil side) of the relay or solenoid being used in order to prevent transient voltage spikes. For more information on this subject, refer to Corporate Bulletin Number 08-08-45-004A.

Inspect for the proper installation and operation of any aftermarket equipment that may interrupt/interfere with the ignition voltage to the ECM. Refer to Checking Aftermarket Accessories in SI.
The following list is an indication of some of the types of aftermarket equipment that upfitters install.

Theft deterrent systems

Relays or solenoids to operate the electrical system of a snow plow or salt spreader

Handicap ramp safety interlock systems

Internal and external communication and lighting systems

<a href="http://gsi.xw.gm.com...rom=sm#N65824">
Warranty Information


For vehicles reprogrammed under the 5 year / 100,000 mile (160,000 km) DURAMAX™ Diesel Engine warranty, use:

Labor Operation



Description



Labor Time



J6353


Powertrain Control Module - Engine Reprogramming with SPS


0.4 hr


N6620


Power and Grounds Distribution Wiring and/or Connector Repair or Replacement


Use Published Labor Operation Time


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
Posted Image
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
How do you write a signature on a laptop screen ??

lmao.


I'm here all week ,try the Veal !!


Rob

#5 govtech4

govtech4

    Senior Enthusiast

  • Member
  • 4,876 posts
  • Name:Rob
  • Location:Alberta
  • Gender:Male

Posted 22 November 2012 - 08:22 PM

last one is a bulletin ,this is the code diagnoses

DTC P0191


Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC P0191 00: Fuel Rail Pressure (FRP) Sensor Performance

Diagnostic Fault Information



Circuit



Short to Ground



Open or High Resistance



Short to Voltage



Signal Performance



Fuel Rail Pressure (FRP) Sensor Signal


P0192 00


P0191 00, P0193 00


P0193 00


P0191 00


Circuit/System Description


The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor. This DTC will set if the FPCM detects a stuck fuel pressure sensor signal.

Conditions for Running the DTC


The engine is running.

DTC P0192, P0193, P0231, P0232, P023F, P064A, P1255 or P06A6 are not active.

DTC P0641 has not failed this ignition cycle.

Fuel pump control is enabled and the fuel pump control state is normal.

The engine has been running for at least 5 seconds.


Conditions for Setting the DTC


The FPCM does not detect a change in the FRP of at least 30 kPa (4.4 psi) over a predetermined variance of the engine speed.

Action Taken When the DTC Sets


The malfunction indicator lamp (MIL) will illuminate.

The FPCM records the operating conditions at the time the diagnostic fails. The FPCM stores this information in the Failure Records.


Conditions for Clearing the DTC


A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.

A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.


Diagnostic Aids


A near empty or empty fuel tank may set this code as current or in history.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.


Reference Information



Schematic Reference

Engine Controls Schematics

Connector End View Reference

Engine Controls Connector End Views

Description and Operation

Fuel System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


Scan Tool Reference

Scan Tool Data List

Scan Tool Data Definitions


Circuit/System Verification

Important: Repair all other driveability DTCs or problems before performing this diagnostic.

Engine ON with the engine idling at normal operating temperature, the Fuel Rail Pressure Sensor parameter should read between 296.4 – 310.3 kPa (43 - 45 psi).

Circuit/System Testing

Important: Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank.

1. Engine ON, vary the engine speed with the accelerator pedal. Verify that P0191 does not set as current.

⇒ If the DTC sets as current, test the fuel line pressure sensor signal circuit for a high resistance. If the circuit tests normal, replace the fuel line pressure sensor.

2. If the DTC does not reset in the FPCM, the system is OK. Do not replace the FPCM.

<a href="http://gsi.xw.gm.com..., 2012#N66052">
Repair Instructions


Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Fuel Pressure Sensor Replacement
How do you write a signature on a laptop screen ??

lmao.


I'm here all week ,try the Veal !!


Rob

#6 06SierraZ71

06SierraZ71

    Old enough to know that you're not!

  • Moderator
  • 3,282 posts
  • Name:Mark
  • Location:Georgia
  • Gender:Male
  • Drives:2006 GMC Sierra SLE 2

Posted 22 November 2012 - 08:27 PM

That's a short troubleshooting tree Rob, where's the rest of it? lol
2006 GMC Sierra, 1500, SLE 2, Crew Cab, Short Bed, Z71, 5.3L (L59), 4L60e, 3.42 gears, G80, Auto Trac 4x4, Midnight Blue Metallic, Truxxx leveling kit, K&N air filter, Line-X bed liner, Tekonsha brake controller, Firestone Destination LE2 tires, Monroe Relfex Shocks, Trail FX side steps. 100,000 mile club! Have Fun and Enjoy the Reading!

#7 govtech4

govtech4

    Senior Enthusiast

  • Member
  • 4,876 posts
  • Name:Rob
  • Location:Alberta
  • Gender:Male

Posted 22 November 2012 - 08:49 PM

i know !!,,it doesnt come out rite here ,makes it real long lol
How do you write a signature on a laptop screen ??

lmao.


I'm here all week ,try the Veal !!


Rob

#8 jacksl

jacksl

    Enthusiast

  • Newbie
  • 2 posts

Posted 23 November 2012 - 12:06 AM

Thanks for the info. I plugged in my code reader and read fuel pressure while driving. At cruising speed speeds it reads about 300kpa or around 44psi. With moderate acceleration it stats to fall off fast down to 40kpa or 5psi of course it its jerking and starving fuel at this time. I assume the sensor is reading correct due to engine stalling.

#9 doug_scott

doug_scott

    Senior Enthusiast

  • Member
  • 2,436 posts
  • Name:Doug Scott
  • Location:Ajax, ON
  • Gender:Male
  • Drives:2010 GMC SL Ext Cab 4.8

Posted 23 November 2012 - 05:03 PM

Just change the fuel filter first. It is a cheap item that is supposed to be changed on a regular basis. It is not part of the fuel pump, not part of the fuel gauge, and not inside the fuel tank. It will create the exact things you are complaining about. It will take less time to change the filter than it takes to research what the codes mean.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users