Question about 1999 Toyota 4Runner

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99 4runner misfire

Freeze Frame Parameter Description Value DTC for which Freeze Frame was Stored
P0302
Fuel System 1 Status Closed Loop
Fuel System 2 Status Not Supported
Calculated LOAD Value 66.67 %
Engine Coolant Temp 197.60 °F
Short Term Fuel Trim - Bank 1 0.78 %
Long Term Fuel Trim - Bank 1 10.16 %
Engine RPM 2773 rpm Vehicle Speed Sensor 32.93 mph
Intake Air Temperature 78.80 °F

PO301 CODE
AS WELL AS PO300...
IVE REPLACED PLUGS WIRES CLEANED MAF SENSOR....IM THINKING COIL PACK OR FAULTY INJECTOR? ANY HELP WOULD BE GREAT...THANKS

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  • kosmindtrip Dec 31, 2008

    that would give a single misfire reading? im really thinking its an injector? is there any way that you know to get an injector ohms reading on cylinder 2 without taking off the plenum...the injector is under th plenum....????

  • Anonymous Mar 31, 2014

    variance of 3.1 %

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Make cranshaft gear has not spun under timing cover ive seen it happen before

Posted on Dec 31, 2008

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2 Answers

Code 172 hhr


DTC P0172: Fuel Trim System Rich !
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of purge to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.
If the ECM detects an excessively rich condition, DTC P0172 sets
Circuit/System Testing For DTC P0172
?€¢
Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The value should be more than approximately -20 percent with the engine running at operating temperature.


?€¢
If the value is not more than -20 percent, inspect for the following:


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With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa.


?‡'
If the MAP sensor parameter is not between 19-42 kPa, refer to DTC P0106 .


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With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.


?‡'
If the MAF sensor parameter is not within 2-6 g/s at idle, refer to DTC P0101 or P1101 or DTC P0102 or P0103 .


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Vacuum hoses for splits, kinks, and improper connections


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The air intake duct for being collapsed or restricted


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The air filter for being dirty or restricted


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Objects blocking the throttle body


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Excessive fuel in the crankcase due to leaking fuel injectors


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The evaporative emissions control system for improper operation


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Excessive fuel pressure


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Malfunctioning fuel injectors


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Fuel contamination


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The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system


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The HO2S signal circuit shorted to voltage

Oct 05, 2015 | Cars & Trucks

1 Answer

How to repair a number two misfire


ok you have P0302 DTC errors. why not POST ALL ERRORS?

P0302

means that cylinder was weak, (NOTHING MORE)

caused by 4 things.

1: bad spark (even spark plugs, ever do a tuneup, BAM , easy peasy)

2: bad compression, (a tests shows 150 or more on #2 and it\'s ok.

3: bad fueling (tool lean or too rich) the real scan tool shows you which it is , did you look at fuel trim and make sure closed loop works at idle and light 40mph cruise (flat ground)?

4: water (coolant) is leaking into combustion chamber.



there are the 4 clauses.



#2 cyl. misfire.



no engine ever stated of the many, opted. so ?????? answers.

Jun 20, 2014 | 2005 Chevrolet Impala

1 Answer

Chrysler pt cruiser code p2096


Trouble Code: P2096

Downstream Fuel System 1/2 Lean

Trouble Code Conditions: Engine running in closed loop mode. Ambient/battery temperature above 20F (-7C). Altitude below 8500 feet. Fuel level is more than 15%. If the PCM adds downstream short-term compensation to long-term adaptive, and a certain percentage is exceeded for 2 trips, a freeze frame is stored, the MIL illuminates and a DTC is set.

Possible Causes:


Exhaust leakEngine mechanical problemO2 Sensor has failedO2 Sensor signal circuit or return circuit problemFuel contamination

Jan 29, 2013 | Chrysler Cars & Trucks

1 Answer

P0068 map/maf throttle position correlation


Hi there:Here's the printout from the diagnostic tool. Year: 2006Manufacturer: ChryslerMake: DodgeModel: DurangoEngine Type: V8, 4.7LTransmission: AutomaticTrim Level: SLTMileage: 127555 KMs
=== Stored Error Code(s) ===Error Code: P2074Possible Causes: Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Higher LoadError Code: P0068Possible Causes: MAP / MAF - Throttle Position Correlation
Freeze Frame Information:1. DTC for which Freeze Frame was Stored - P2074.2. Fuel System 1 Status - Closed Loop.3. Fuel System 2 Status - Closed Loop.4. Calculated LOAD Value - 74.51 percent.5. Engine Coolant Temp - 199.40 degrees F.6. Short Term Fuel Trim - Bank 1 - -3.91 percent.7. Long Term Fuel Trim - Bank 1 - -3.13 percent.8. Short Term Fuel Trim - Bank 2 - 0.78 percent.9. Long Term Fuel Trim - Bank 2 - -4.69 percent.10. Intake Manifold Absolute Pressure - 22.21 Inhg.11. Engine RPM - 2,404.00 Rpm.12. Vehicle Speed Sensor - 73.94 Mph.13. Ignition Timing Advance #1 Cylinder - 25.50 degrees.14. Intake Air Temperature - 64.40 defrees F.15. Absolute Throttle Position - 31.37 percent.16. Time Since Engine Start - 1212 Sec.17. Commanded EGR - 7.06 percent.18. EGR Error - 0.00 percent.19. Commanded Evaporative Purge - 62.35 percent.20. Fuel Level Input - 93.73 percent.21. Barometric Pressure - 26.35 Inhg.22. Control Module Voltage - 14.35 V.23. Absolute Load Value - 0.00 percent.24. Commanded Equivalence Ratio - 0.00.25. Relative Throttle Position - 0.00 percent.26. Ambient Air Temperature - -40.00 degrees F.
Monitor Information:1. MIL - OFF.2. Misfire Monitor - Complete.3. Fuel System Monitor - Complete.4. CCM Monitor - Complete.5. Catalyst Monitor - Complete.6. Heated Catalyst Monitor - Not Supported.7. EVAP Monitor - Complete.8. Secondary Air System Monitor - Not Supported.9. O2 Sensor Monitor - Complete.10. O2 Sensor Heater Monitor - Complete.11. EGR Monitor - Complete.12. NMHC Monitor - Not Supported.13. Nox Adsorber Monitor - Not Supported.14. Boost Pressure System Monitor - Not Supported.15. Exhaust Gas Sensor Monitor - Not Supported.16. PM Filter Monitor - Not Supported.

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Mar 04, 2012 | 2005 Dodge Durango SLT

1 Answer

Check engine light is on. Does replacing the oil filter fix the problem? The codes are: P171, P174


very Unlikely this will have any affect. sounds more like an air leak to me.
You will find all codes available at http://www.bluejag.co.uk/decode.php



Fault Code:- P0171 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 1 combustion too lean

Action of ECM:- ECM Default:- Bank 1 catalyst warm-up ignition ****** inhibited- Bank 1 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:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (1/1, 1/2) 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
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


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:- 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

Sep 09, 2011 | 2004 Jaguar X-Type

1 Answer

I have a scion tc 05 with this code p171 . what does it mean?


DTC P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:
1. Exhaust system leak.
2. Improper fuel pressure.
3. Fuel injector restricted.
4. Defective heated oxygen sensor No. 1.
5. Defective Manifold Absolute Pressure (MAP) sensor.
6. Defective Engine Coolant Temperature (ECT) sensor.
When the air fuel ratio feedback is stable after the engine is at operating temperature and the fuel trim has reached its limit of correction to the rich side. (2 trip logic).
Feedback from the HO 2 sensor influences short-term fuel trim and short-term fuel trim influences long trim fuel trim. Short-term values are temporary and not stored when the ignition key is turned off. Long-term values are stored in memory because they are part of the basic injection duration. Long term values affect injection duration in closed and open loop because they are used to calculate basic injection duration. It is important to remember that the actual fuel trim will be the opposite of the DTC. A system too lean, DTC P0171 will mean the ECM is making a + or rich correction.
read (and let me know)above data and Freeze Frame by using (example, generic) Scan Tool on # mode 2, etc.
Slowly accelerate the engine in the increments shown and record voltage,
grams/sec of MAF and SFT, LFT, Injection Pulse, Fuel Pressure, etc.
HTH,
Vehicle have MAF Sensor?

Jan 03, 2011 | 2001 Toyota Corolla

1 Answer

2002 Ford Mustang GT I used OBD-II to get the trouble codes, I got P0174,P0301,P302,P316 Freeze Frame Information: 1. DTC for which Freeze Frame was Stored - P0174 2. Fuel System 1 Status - Closed...


Because you got a misfire on cylinder #1 PO301
A misfire on cylinder #2 PO302
Misfires first 1000 rev PO316
O2 Codes PO 174
Etc,Etc


The LTT, is the result of not learning (yet-thus long term)
what isn't working correctly---Your Engine

Replace bad Coil--which ever is missing
Do not go by the codes,alone ,TEST

Dec 10, 2010 | 2002 Ford Mustang

1 Answer

2004 or 05 Jeep Wrangler dtc P2096 (Post catalyst fuel trim bank 1 to lean). It set the mil lamp and then reset it self. Pulled the code with a scanner and found 1 of 2 to be P2096 and 2of 2 to be P2096...


Here is more information about P2096
P2096-DOWN STREAM FUEL TRIM LEAN BANK 1

WHEN MONITORED 
With the engine running in closed loop mode, the ambient/battery temperature above (-7°C) 20°F , altitude below 8500 ft and fuel level greater than 15%.

SET CONDITION 
If the PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.

Here are some possible casuses:
Exhaust leak
Engine mechanical problem
02 sensor
02 signal circut
02 return circut
Fuel contamination

Good luck and hope this helps. 

Jun 21, 2009 | 2006 Jeep Wrangler

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