Question about Ford Ranger

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I HAD 1999 FORD RANGER WITH 4.0 ENGINE ENGINE RUNS OK BUT MISFIRE COLD CHECK FOR DTC AND I GET P0175 (ENGINE RUNS RICH AT BANK 2) HOW I FIX THIS ALREADY REPL,INTake manifold gasket ,and regap spark plugs cause where over60 regap to 54 all them how i fix this one

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  • leonel alvarado Oct 06, 2010

    mr: taran u are very helpfull i forget to mention my dtc where on bank and u read my mind thanks a lot u make a lot off sense cause all information u give out help i will check my fuel pressure and i hope , get this think done,(fix rigth the first time) tanks u are the men

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Hi,

This code is for a too rich condition on the drivers side bank of the engine,as I am sure that you are aware. The condition is likely caused by excess fuel getting into the engine on one bank.Usually this will be caused by a faulty fuel pressure regulator.I suggest removing the vacuum line from the regulator to see if there is fuel leaking into the vacuum line.

There is a complete diagnostic procedure for this code.

FORD: 1990-1997 THUNDERBIRD
1990-1999 MUSTANG, TAURUS SHO
1991-1999 CROWN VICTORIA, ESCORT, TAURUS
1992-1994 TEMPO
1993-1997 PROBE
1995-1999 CONTOUR
LINCOLN-MERCURY: 1990-1997 COUGAR
1991-1999 CONTINENTAL, GRAND MARQUIS, SABLE, TOWN CAR, TRACER
1992-1994 TOPAZ
1993-1998 MARK VIII
1995-1999 MYSTIQUE
LIGHT TRUCK: 1990 BRONCO II
1990-1997 AEROSTAR
1990-1999 RANGER
1991-1999 EXPLORER
1994-1996 BRONCO
1994-1997 F SUPER DUTY, F-250 HD
1994-1999 ECONOLINE, F-150, F-250 LD, F-350
1995-1999 WINDSTAR
1997-1999 EXPEDITION, MOUNTAINEER
1998-1999 NAVIGATOR
1999 F-250 HD, SUPER DUTY F SERIES
ISSUE:

This TSB article is a diagnostic procedure to address vehicles that exhibit lean driveability symptoms and may or may not have any Diagnostic Trouble Codes (DTCs) stored in memory.
ACTION:

Follow the diagnostic procedures described in the following Service Tip. The revised diagnostic procedure is a more accurate means of diagnosing the symptoms.
SERVICE TIP
MASS AIR FLOW (MAF) DISCUSSION

MAF sensors can get contaminated from a variety of sources: dirt, oil, silicon, spider webs, potting compound from the sensor itself, etc. When a MAF sensor gets contaminated, it skews the transfer function such that the sensor over-estimates air flow at idle (causes the fuel system to go rich) and under-estimates air flow at high air flows (causes fuel system to go lean). This means Long Term Fuel Trims will learn lean (negative) corrections at idle and learn rich (positive) corrections at higher air flows.

If vehicle is driven at Wide Open Throttle (WOT) or high loads, the fuel system normally goes open loop rich to provide maximum power. If the MAF sensor is contaminated, the fuel system will actually be lean because of under-estimated air flow. During open loop fuel operation, the vehicle applies Long Term Fuel Trim corrections that have been learned during closed loop operation. These corrections are often lean corrections learned at lower air flows. This combination of under-estimated air flow and lean fuel trim corrections can result in spark knock/detonation and lack of power concerns at WOT and high loads.

One of the indicators for diagnosing this condition is barometric pressure. Barometric pressure (BARO) is inferred by the Powertrain Control Module (PCM) software at part throttle and WOT (there is no actual BARO sensor on MAF-equipped vehicles, except for the 3.8L Supercharged engine). At high air flows, a contaminated MAF sensor will under-estimate air flow coming into the engine, hence the PCM infers that the vehicle is operating at a higher altitude. The BARO reading is stored in Keep Alive Memory (KAM) after it is updated. Other indicators are Long Term Fuel Trim and MAF voltage at idle.

NOTE: THE FOLLOWING PROCEDURE MAY ALSO BE USED TO DIAGNOSE VEHICLES THAT DO NOT HAVE FUEL SYSTEM/HO2S SENSOR DTCs.
Symptoms

* Lack of Power
* Spark Knock/Detonation
* Buck/****
* Hesitation/Surge on Acceleration
* Malfunction Indicator Lamp (MIL) Illuminated - DTCs P0171, P0172, P0174, P0175 may be stored in memory

OBDII DTCs

* P0171, P0174 (Fuel system lean, Bank 1 or 2)
* P0172, P0175 (Fuel system rich, Bank 1 or 2)
* P1130, P1131, P1132, (HO2S11 lack of switching, Bank 1)
* P1150, P1151, P1152, (HO2S21 lack of switching, Bank 2)

OBDI DTCs

* 181, 189 (Fuel system lean, Bank 1 or 2)
* 179, 188 (Fuel system rich, Bank 1 or 2)
* 171, 172, 173 (HO2S11 lack of switching, Bank 1)
* 175, 176, 177 (HO2S21 lack of switching, Bank 2)
* 184, 185 (MAF higher/lower than expected)
* 186, 187 (Injector pulse width higher/lower than expected)

NOTE: DO NOT DISCONNECT THE BATTERY. IT WILL ERASE KEEP ALIVE MEMORY AND RESET LONG TERM FUEL TRIM AND BARO TO THEIR STARTING/BASE VALUES. THE BARO PARAMETER IDENTIFICATION DISPLAY (PID) IS USED FOR THIS DIAGNOSTIC PROCEDURE. ALL OBDII APPLICATIONS HAVE THIS PID AVAILABLE. THERE ARE SOME OBDI VEHICLES THAT DO NOT HAVE THE BARO PID, FOR THESE VEHICLES OMIT THE BARO CHECK AND REFER ONLY TO STEPS 2, 3, AND 4 IN THE DIAGNOSTIC PROCEDURE.

1. Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in. Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in. Hg.). Normal learned BARO variability is up to ±6 Hz (±2 in. Hg.). If BARO indicates a higher altitude than you are at (7 or more Hz lower than expected), you may have MAF contamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as a barometric pressure reference. Use "MAP/BARO" test under "Powertrain," "Testers and Meters." Ignore the hookup screen. Connect GP2 to the reference MAP on the following screen.

NOTE: REMEMBER THAT MOST WEATHER SERVICES REPORT A LOCAL BAROMETRIC PRESSURE THAT HAS BEEN CORRECTED TO SEA LEVEL. THE BARO PID, ON THE OTHER HAND, REPORTS THE ACTUAL BAROMETRIC PRESSURE FOR THE ALTITUDE THE VEHICLE IS BEING OPERATED IN. LOCAL WEATHER CONDITIONS (HIGH AND LOW PRESSURE AREAS) WILL CHANGE THE LOCAL BAROMETRIC PRESSURE BY SEVERAL INCHES OF MERCURY (±3 Hz, ±1 in. Hg.).

NOTE: BARO IS UPDATED ONLY WHEN THE VEHICLE IS AT HIGH THROTTLE OPENINGS. THEREFORE, A VEHICLE WHICH IS DRIVEN DOWN FROM A HIGHER ALTITUDE MAY NOT HAVE HAD AN OPPORTUNITY TO UPDATE THE BARO VALUE IN KAM. IF YOU ARE NOT CONFIDENT THAT BARO HAS BEEN UPDATED, PERFORM THREE OR FOUR HEAVY, SUSTAINED ACCELERATIONS AT GREATER THAN HALF-THROTTLE TO ALLOW BARO TO UPDATE.

Continue........

Posted on Oct 06, 2010

  • taran_2005
    taran_2005 Oct 06, 2010

    Continue...

    BAROMETRIC PRESSURE REFERENCE

    Barometric Pressure (in. Hg.) Barometric Pressure (kPa) BARO/MAP PID (Hz) Altitude above sea level (ft)

    3.5 11.8 89.3

    5 16.9 92.8

    10 33.8 104.6

    15 50.7 117.0 14,000

    20 67.5 129.6 10,000

    21 70.9 132.5 9,000

    22 74.3 135.4 8,000

    23 77.7 138.3 7,000

    24 81.1 141.1 6,000

    25 84.4 144.0 5,000

    26 87.8 146.9 4,000

    27 91.2 149.8 3,000

    28 94.6 152.8 2,000

    29 97.9 155.8 1,000

    30 101.3 158.9 0 (sea level)

    31 104.7 162.0

    31.875 107.7 164.7





    # On a fully warmed up engine, look at Long Term Fuel Trim at idle, in
    Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is more negative
    than -12%, the fuel system has learned lean corrections which may be due
    to the MAF sensor over-estimating air flow at idle. Note that both
    Banks 1 and 2 will exhibit negative corrections for 2-bank system. If
    only one bank of a 2-bank system has negative corrections, the MAF
    sensor is probably not contaminated.

    # On a fully warmed up engine, look at MAF voltage at idle, in Neutral,
    A/C off (MAF V PID). If it's 30% greater than the nominal MAF V voltage
    listed in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic
    Value Reference Charts for your vehicle, or greater than 1.1 volts as a
    rough guide, the MAF sensor is over-estimating air flow at idle.

    # If at least two of the previous three steps are true, proceed to
    disconnect the MAF sensor connector. This puts the vehicle into Failure
    Mode and Effects Management (FMEM). In FMEM mode, air flow is inferred
    by using rpm and throttle position instead of reading the MAF sensor.
    (In addition, the BARO value is reset to a base/unlearned value.) If the
    lean driveability symptoms go away, the MAF sensor is probably
    contaminated and should be replaced. If the lean driveability symptoms
    do not go away, go to the PC/ED Service Manual for the appropriate
    diagnostics.



    NOTE: DUE TO INCREASINGLY STRINGENT EMISSION/OBDII REQUIREMENTS, IT
    IS POSSIBLE FOR SOME VEHICLES WITH MAF SENSOR CONTAMINATION TO SET FUEL
    SYSTEM DTCs AND ILLUMINATE THE MIL WITH NO DRIVEABILITY CONCERNS.
    DISCONNECTING THE MAF ON THESE VEHICLES WILL, THEREFORE, PRODUCE NO
    IMPROVEMENTS IN DRIVEABILITY. IN THESE CASES, IF THE BARO, LONGFT1,
    LONGFT2, AND MAF V PIDs INDICATE THAT THE MAF IS CONTAMINATED, PROCEED
    TO REPLACE THE MAF SENSOR.



    After replacing the MAF sensor, disconnect the vehicle battery (5
    minutes, minimum) to reset KAM, or on newer vehicles, use the "KAM
    Reset" feature on the New Generation Star (NGS) Tester and verify that
    the lean driveability symptoms are gone.

    Let me know,if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!

  • taran_2005
    taran_2005 Oct 06, 2010

    Thanks for your response!!

    You are welcome.

    Any further questions, you could revert and i would be glad to answer.

    Do not forget to accept the solution,if 100% satisfied from my response.

    Let me know,if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!

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I have a toyota corolla 2003 and it did not pass the emission test due to a sensor with code P0175


so get it fixed? no engine size posted. so ???? impossible to be accurate.
or DIY, you have tools? and skills. to do that.
it means the Oxygen sensor has issues.
means bank 2 is stuck rich
bank 2 means car is V6. bank 2 means bank with #2 cylinder loc.

for much better, reasons and test. see here

http://www.scantool.net/software/alldata-diy-1-month-subscription.html

is this the only DTC code.??? no others, and did you use a scan tool
that can read all Toy codes, like P1xxx ? codes factory codes.
if not you missed the boat.
my wild guess. (i do tests in real world)
bank 2 is rich.
due to what?
1: misfiring, ever do a tune up? see fouled spark plugs bank 2, look.
2: injector leaking.

there are lost of tests, im not going to list them all.
but it takes tools and time.
compression at spec. bank 2?
OIL FOULED SPARK PLUGS, there, oops.
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I would like to know what the following codes represent for my 2002 jaguar x-type 3.0 Codes are P174, P175, P1111


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The other DTC refer to mixture issues.

From http://www.bluejag.co.uk

Fault Code:- P0174 Indicates a Power-train fault
The fault is generally due to a problem in the Emission Management (Fuel or Air) area
Fault Description: Bank 2 combustion too lean
Action of ECM:- ECM Default: - Bank 2 catalyst warm-up ignition ****** inhibited - Bank 2 closed loop fuel metering inhibited - Canister purge inhibited - Maximum engine speed reduced
Possible Fault:-
Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor

once again from http://www.bluejag.co.uk

Fault Code:- P0175 Indicates a Power-train fault
The fault is generally due to a problem in the Emission Management (Fuel or Air) area
Fault Description: Bank 2 combustion too rich

Action of ECM:- ECM Default: - Bank 2 catalyst warm-up ignition ****** inhibited - Bank 2 closed loop fuel metering inhibited - Canister purge inhibited - Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature > 82 °C (180 °F) Idle for 10 minutes

Check for a reoccurrence of fault DTC.

Possible Fault:- Restricted air filter Leaking fuel injector(s) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor

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P1151 means a lean bank 2 O2 sensor
P1152 Means a rich bank 2 O2 sensor
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I would check your fuel injector for fouling
When they foul the will develop a drip
Causing a fuel fluctuation that will have O2 sensors reporting rich and lean voltage changes
This causes the pcm to adjust injector pulses making them shorter and longer.
causing more fuel or less fuel.
From this condition you may see plug fouling.
Also check for leaking or faulty fuel pressure regulator or restricted return line.
Most of the time it wont be a bad O2 sensor the O2 sensor is just doing its job.
You also have already changed the plugs and Map so there already out of the way.
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