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Discussion Starter · #1 ·
Hey guys..it's been a while since I been on here but I came back to ask a favor. I found a soft code p1111 while had my car hooked up to the kia gds. It said cylinder pressure too high. I also noticed my fuel rail pressure was hitting 2400psi which is a few hundred more than it's supposed to max at. Can you guys let me know what your fuel rail is capping at? Just trying to narrow it down cause gds suggested a knock sensor or spark plugs. I know both are fine on my car. I also noticed running premium is more harmful than good causing the same soft code in other 1.6tgdi cars. I lowered the octane but it's still coming back at around 70mph. My theory is the super high fuel pressure what do you guys think?
 

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@precrack check the latest pitstop release for hard start in the morning. its not a direct hit on your issue but could be the issue
 

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I wouldn't run anything less than 93 octane. Higher octane will keep you from detonating or "knocking." I have run 93 or higher when possible since the day I bout the car 10K miles ago.

Does the system automatically recommend something to you for replacement? A new knock sensor or spark plugs will not reduce cylinder pressure.
In fact, I don't believe this engine has a sensor on the engine that directly measure this.

I remember seeing in KGIS (before they started charging us :( ) that the fuel pressure sensor was functional at pressures above 2400 (almost 3000 I think was where it maxed at in voltage). I think your fuel pressure readings are fine, I see those normally as well.
 

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FORTE(YD) > 2015 > G 1.6 T-GDI > Engine > Engine Control > P1111 Cylinder Pressure Too High


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General Description

Knocking is a phenomenon characterized by undesirable vibration and noise that can cause engine damage. A knock sensor (KS) is mounted on the cylinder block and senses engine knocking. A knocking vibration from the cylinder block is applied as pressure to the piezoelectric element. A knock sensor (KS) detects vibration when RPM rises or drops and generates voltages based on this vibration. The ECM controls the ignition timing based on the amplitude and frequency of the knock sensor signal. For example, if engine knocking occurs, the ignition timing is retarded to prevent it.



FORTE(YD) > 2015 > G 1.6 T-GDI > Engine > Engine Control > P1111 Cylinder Pressure Too High


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DTC Description

If knock signal is over THD(Total Harmonic Distortion), the ECM sets DTC P1111.

DTC Detecting Condition



Item
Detecting Condition
Possible Cause

DTC Strategy


Engine Oil Level, Spark Plug, Injector


1.
Engine Oil Level


2.
Spark plug(gap, crack, contamination)


3.
Knock Sensor


Enable Conditions


Engine Idle



Turbocharger ON(Ratio of air flow over 120%)



Coolant Temp. over 70 °C(158 °F)



Engine RPM > 2440


Threshold Value


Knock Signal > THD(Total Harmonic Distortion)


Diagnostic Time


-


MIL ON Condition


MIL OFF(DTC only)
Monitor DTC Status

1.
Connect GDS to DLC(Data Link Cable).


2.
IG "ON".


3.
Select "Diagnostic Trouble Codes(DTC)" Analysis and press "DTC Status".




4.
Is the parameter displayed "Present"?





▶ Go to "Monitor GDS Data".



▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.




Monitor GDS Data

1.
Connect GDS to DLC (Data Link Cable).


2.
Warm up the engine to normal operating temperature.


3.
Check the "Current Data" about related DTC with GDS.



Fig.1) Engine Idle after Warm Up
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4.
Are the parameters displayed correctly?





▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.



▶ Go to "Terminal and Connector inspection" procedure.



FORTE(YD) > 2015 > G 1.6 T-GDI > Engine > Engine Control > P1111 Cylinder Pressure Too High


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Terminal and Connector Inspection

1.
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.


2.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.


3.
Have any problems been found?





▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.



▶ Go to "System Inspection" procedure.
 

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just an example of how shitty Kia diag is.. Most of the time im making my own diag to get the job done. Def not easy in this particular field. every day is a challenge
 

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Can this be checked through the tourque program at all? I would like to see what mine is at to
 

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Fuel pressure will go that high. When checking the pressure also match it to desired from the ecu
 

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Discussion Starter · #8 ·
Hey thanks for posting the gds print I actually used that as a reference today as I was checking a few things in my free time. Still no luck so far on why its there also why it keeps coming back. I think I'm going to try deleting the adaptive learnings and install the stock intake. It's a long shot but I'm starting to run out of ideas lol.
 

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I just found this soft code P1111.
I am not sure when it appeared, but I checked for codes after having a few miles trip when, without obvious reason why, turbo was not boosting. It would peak 3-5 PSI.

The boost came back on its own... It was in the middle of a city trip.


And it was through Torque App (full version).
 
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