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I have a 2002 tahoe suv where is the po178 Fuel composition sensor circuit low locate and where can purschase it a low cost. The red light stay on and it doesnt effect the running of the car but need

Po 178 fuel composition sensor circuit low where is it location? 2002 chev tahoe engine size5300 v8

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Posted on Jan 02, 2017

Ajkill
  • 2035 Answers

SOURCE: need schematic for location of ECM on 2002 Chev Silverado 5.3L GAS ENGINE

Please use this link :

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152801b6773


Good luck...

Posted on Aug 14, 2008

  • 1 Answer

SOURCE: locating the fuel pressure regulator

its located under the upper intake plenum on the side of the injector metering block

Posted on Feb 23, 2009

  • 43 Answers

SOURCE: service engine soon light on 2002 chevrolet tahoe stays on

That normally means that you have a issue with your gas cap try replacing your gas cap first then diconnect the negative terminal of the battery for about three minutes to clear the memory and start the truck again

Posted on Apr 11, 2009

GMJunkie
  • 74 Answers

SOURCE: Where is the O2 sensor circuit (bank 1 sensor 2)

Behind the drivers side Catalytic Converter!

Posted on Mar 09, 2010

  • 630 Answers

SOURCE: Tahoe 2002 service engine soone

Code p0178 is fuel compensation sensor circuit low input.
Code p0440 is evap emmision control system malfunction.
I retrieved this blog for you on the Flex fuel Issue.

How to fix SES P0178 and P0179 - Flex Fuel Sensor

dot.gif What is Flex Fuel?

A flexible fueled vehicle (FFV) has a single fuel tank, fuel system, and engine. The vehicle is designed to run on unleaded gasoline and an alcohol fuel (usually ethanol) in any mixture. The engine and fuel system in a flex-fuel vehicle must be adapted slightly to run on alcohol fuels because they are corrosive. There must also be a special sensor in the fuel line to analyze the fuel mixture and control the fuel injection and timing to adjust for different fuel compositions.

What Service Engine Soon codes does it throw?

P0178 and P0179 are directly related to the sensor its self

P0178 - Fuel Composition Sensor. Sensor Circuit Low Volts
P0179 - Fuel Composition Sensor. Sensor Circuit High Volts

Can this really effect anything?

Yes, It can cause your truck to run richer then it should.

Also codes (P0440), should go away after replacing the Flex Fuel sensor.

How much does this sensor cost and what is the part number?

There are 2 part numbers (both are the same part):
The first one: 12568450 (older part number)
The second one: 12570260 (most recent)

From a GM dealer this part will run $613
From GMPartsDirect.com it runs $350

dealer will charge around $900-1100 to fix!


Where is the sensor located and what does it look like?

Passenger side, Front frame rail. Right behind the wheel well.

It has 2 fuel lines coming out of it and 1 power.

Actual pic from engine area:
agi.jpg

Stock picture of the part:

flexfuel2.jpg

What kind of tools are needed to replace this myself?

Size 13mm Socket
Fuel Line disconnects ($5 - $10)

I Circled the correct one to use:
fuelline.jpg

How long does it take and is it easy?

Yes it is easy, and it takes about 2-3 hours depending on how you go about getting to it. Take your time and be careful! (a little bit of gas will come out of those lines)

I pulled off the passenger side wheel and went thru the wheel well with a friend under the truck helping. Hard to remove I don't recommend a DIYer on this one.

Posted on Aug 29, 2010

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1 Answer

Could a po178 code cause a repeated fuel pump failure on a 2003 chevy tahoe?


From reading the circuit description from the factory service info . I would say no .
Alcohol content and fuel temperature information is supplied to the powertrain control module (PCM) from the fuel composition sensor (FCS). The FCS has an ignition 1 circuit, a signal circuit, and a ground circuit. The FCS uses a microprocessor inside the sensor to measure the ethanol percentage and fuel temperature, and changes output signals accordingly. The signal circuit carries both the ethanol percentage, and the fuel temperature within the same signal. The signal is both variable frequency and variable pulse width. The frequency signal indicates the ethanol percentage, and the pulse width indicates fuel temperature. The PCM provides an internal pull up to 5 volts on the signal circuit, and the FCS pulls the 5 volts to ground in pulses. The normal range of operating frequency is between 50-150 Hz. The normal pulse width ranges between 1-5 milliseconds. If the PCM detects a signal less than 45 Hz DTC P0178 will set.

How often have you have to replace the pump and how many times ? Just off the top of my head , without test the fuel pump pressure and doing some testing on the electrical circuit , i'd say you have a resistance problem . Something making the pump work harded then it should . Plus how full do you keep your fuel tank ? If you let it get below a 1/4 of a tank regularly ,this could cause premature failure. Also it would be a good idea to do amp draw testing ! Fuel Pump Current Draw

Feb 02, 2017 | Cars & Trucks

1 Answer

Break light stays on in my 2002 chevy tahoe?


try getting under your car in the rear some times the e brake cable sticks spray some wd40 on it and pull it should unlock it see this were I work all the time hope this helps

Feb 05, 2014 | 2002 Chevrolet Tahoe

1 Answer

Po178 po179


codes p0178 and 179 refer to fuel composition sensor--low and high input respectfully==causes for 178 are wiring--- short to ground--fuel composition sensor--ECM and for 179 are wiring short to positive-- fuel composition sensor---ECM

Dec 06, 2013 | Cars & Trucks

2 Answers

P0178


This is a failure code for a fuel composition sensor and man are they proud of these sensors. Last time I put one on the price for the sensor was almost 500.00. This does usually not cause a driveability problem. Here is a circuit description

Alcohol content and fuel temperature information is supplied to the powertrain control module (PCM) from the fuel composition sensor (FCS). The FCS has an ignition 1 circuit, a signal circuit, and a ground circuit. The FCS uses a microprocessor inside the sensor to measure the ethanol percentage and fuel temperature, and changes output signals accordingly. The signal circuit carries both the ethanol percentage, and the fuel temperature within the same signal. The signal is both variable frequency and variable pulse width. The frequency signal indicates the ethanol percentage, and the pulse width indicates fuel temperature. The PCM provides an internal pull up to 5 volts on the signal circuit, and the FCS pulls the 5 volts to ground in pulses. The normal range of operating frequency is between 50-150 Hz. The normal pulse width ranges between 1-5 milliseconds. If the PCM detects a signal less than 45 Hz DTC P0178 will set.

Your stall when put in gear is most likely due to a dirty throttle body (carbon build up). Remove the air intake tube to the throttle body & use a spray can of carb spray & a shop towel to clean the carbon from the throttle bore & plate.

Fuel Composition Sensor Replacement - Removal Procedure
Turn OFF the ignition.
Relieve the fuel pressure

zjlimited_669.gif

Raise the vehicle.
Remove the fuel composition sensor fuel composition sensor (FCS) attachment nuts (1).

zjlimited_670.gif

Disconnect the FCS inlet and outlet pipes from the FCS.

zjlimited_671.gif

Disconnect the FCS electrical connector (1).
Remove the FCS and bracket assembly from the frame rail.

zjlimited_672.gif

Remove the FCS bolts and remove from the bracket.


Installation Procedure

zjlimited_673.gif

Install the FCS to the bracket and install bolts.
Tighten
Tighten bolts to 10 N·m (89 lb in).

Install FCS and bracket assembly to frame.

zjlimited_674.gif

Install FCS bracket to frame nuts.
Tighten
Tighten nuts (1) to 17 N·m (13 lb ft).

zjlimited_675.gif

Connect the FCS inlet and outlet pipes to the FCS.

zjlimited_676.gif


Connect the FCS electrical connector (1).
Lower the vehicle.
Start the engine and check for fuel leaks.


Hope this helps.

Sep 02, 2011 | 2002 GMC Yukon XL

1 Answer

My 03 chevy tahoe has a code dhat is po179 is not pas inspection


Sounds like the fuel composition sensor is bad causing it to run rich .. Is your Tahoe a flex fuel ?

Apr 08, 2011 | 2002 Chevrolet Tahoe

1 Answer

OBDC PO178. Changed the fuel filter, air filter, and spark plugs. How exactly do you change the flex fuel sensor? Where is it located? And are the replica/ bypass parts ok to use instead if you never plan...


On Board Diagnostic Codes-- DO NOT tell you
what is wrong or what to replace

None of what you replaced was necessary for a PO178

Have it scanned and diagnosed professionally

Mar 26, 2011 | 2002 Chevrolet Tahoe

1 Answer

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160....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

P0161....O2 Sensor Heater Circuit (Bank 2 Sensor 2)

P0162....O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)

P0163....O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)

P0164....O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)

P0165....O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)

P0166....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)

P0167....O2 Sensor Heater Circuit (Bank 2 Sensor 3)

P0168....Fuel Temperature Too High

P0169....Incorrect Fuel Composition

P0170....Fuel Trim (Bank 1)

P0171....System too Lean (Bank 1)

P0172....System too Rich (Bank 1)

P0173....Fuel Trim Malfunction (Bank 2)

P0174....System too Lean (Bank 2)

P0175....System too Rich (Bank 2)

P0176....Fuel Composition Sensor Circuit

P0177....Fuel Composition Sensor Circuit Range/Performance

P0178....Fuel Composition Sensor Circuit Low Input

P0179....Fuel Composition Sensor Circuit High Input

P0180....Fuel Temperature Sensor A Circuit

P0181....Fuel Temperature Sensor A Circuit Range/Performance

P0182....Fuel Temperature Sensor A Circuit Low Input

P0183....Fuel Temperature Sensor A Circuit High Input

P0184....Fuel Temperature Sensor A Circuit Intermittent

P0185....Fuel Temperature Sensor B Circuit

P0186....Fuel Temperature Sensor B Circuit Range/Performance

P0187....Fuel Temperature Sensor B Circuit Low Input

P0188....Fuel Temperature Sensor B Circuit High Input

P0189....Fuel Temperature Sensor B Circuit Intermittent

P0190....Fuel Rail Pressure Sensor Circuit

P0191....Fuel Rail Pressure Sensor Circuit Range/Performance

P0192....Fuel Rail Pressure Sensor Circuit Low In put

P0193....Fuel Rail Pressure Sensor Circuit High Input

P0194....Fuel Rail Pressure Sensor Circuit Intermittent

P0195....Engine Oil Temperature Sensor

P0196....Engine Oil Temperature Sensor Range/Performance

Nov 20, 2010 | 2004 Volvo S80

1 Answer

2002 Chevy Suburban idling rough in park and at stop lights.


the computer might have set up to a bad mix from the fuel additive or could have damaged the ox sensor .remove the battery terminal for 5 min replace and see what happens , worth a shot before you spend out money

Nov 19, 2008 | 2001 Chevrolet Tahoe

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