You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!
The banners on the left side and below do not show for registered users!
If you have any problems with the registration process or your account login, please contact contact us.
Hi guys, been chasing a check engine light (p0300), pulled the following data and just need some advice as to what it could be.
Any help or tips would be appreciated, thanks.
Frame Before CEL
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated LOAD Value(%)26.7
Engine Coolant Temperature(。C)86
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)-1.6
Intake Manifold Absolute Pressure(kPa)68.0
Engine RPM(rpm) 3768
Vehicle Speed Sensor(km/h)53
Ignition Timing Advanced for #1 Cylinder(。)56.5
Intake Air Temperature(。C)30
Absolute Throttle Position(%)29.4
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.765
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
OBD requirements to which vehicle is designedOBDII
Time Since Engine Start(sec)570
Distance Travelled While MIL is Activated(Km)1
Commanded Evaporative Purge(%)74.5
Fuel Level Input(%)22.0
Number of warm-ups since diagnostic trouble codes cleared1
Distance since diagnostic trouble codes cleared(Km)6
Evap System Vapor Pressure(Pa)-601.75
Barometric Pressure(kPa)100
Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.013
Oxygen Sensor Current(Bank 1-Sensor 1)(mA)0.035
Catalyst Temperature Bank 1,Sensor 1(。C)609.0
Control module voltage(V)14.250
Absolute Load Value(%)40.0
Commanded Equivalence Ratio0.999
Relative Throttle Position(%)22.7
Ambient air temperature(。C)16
Absolute Throttle Position B(%)29.8
Accelerator Pedal Position D(%)27.5
Accelerator Pedal Position E(%)27.8
Commanded Throttle Actuator Control(%)25.1
Frame During CEL
Number of DTCs stored in this ECU 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated LOAD Value(%)30.2
Engine Coolant Temperature(。C)86
Short Term Fuel Trim -Bank 1(%)2.3
Long Term Fuel Trim - Bank 1(%)-1.6
Intake Manifold Absolute Pressure(kPa)95.0
Engine RPM(rpm) 3778
Vehicle Speed Sensor(km/h)53
Ignition Timing Advanced for #1 Cylinder(。)57.0
Intake Air Temperature(。C)30
Absolute Throttle Position(%)30.2
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.76OBD requirements to which vehicle is designedOBDII
Fuel Level Input(%)22.0
leared1
Distance since diagnostic trouble codes cleared(Km)Oxygen Sensor Current(Bank 1-Sensor 1)(mA)-0.051
Relative Throttle Position(%)24.3
Accelerator Pedal Position D(%)27.8
Number of DTCs stored in this ECU 0
Calculated LOAD Value(%)30.6
Long Term Fuel Trim - Bank 1(%)-1.6
Vehicle Speed Sensor(km/h)54
Absolute Throttle Position(%)31.0
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
Distance Travelled While MIL is Activated(Km)1
Distance since diagnostic trouble codes cleared(Km)Oxygen Sensor Current(Bank 1-Sensor 1)(mA)0.016
Commanded Equivalence Ratio1.000
Absolute Throttle Position B(%)19.6
Additional Data
Fuel system 1 statusOL-Drive
Engine Coolant Temperature(。C)85
Intake Manifold Absolute Pressure(kPa)32.0
Absolute Throttle Position(%)19.2
5
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
Time Since Engine Start(sec)574
Number of warm-ups since diagnostic trouble codes cEvap System Vapor Pressure(Pa)-537.75
Oxygen Sensor Current(Bank 1-Sensor 1)(mA)0.074
Commanded Equivalence Ratio1.000
Ambient air temperature(。C)16
Accelerator Pedal Position E(%)26.7
Number of DTCs stored in this ECU 0
Fuel System 2 status--
Engine Coolant Temperature(。C)85
Intake Manifold Absolute Pressure(kPa)88.0
Ignition Timing Advanced for #1 Cylinder(。)47.5
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.13
Time Since Engine Start(sec)575
Distance Travelled While MIL is Activated(Km)1
leared1
Distance since diagnostic trouble codes cleared(Km)Barometric Pressure(kPa)100
Oxygen Sensor Current(Bank 1-Sensor 1)(mA)-0.039
Commanded Equivalence Ratio0.999
Absolute Throttle Position B(%)30.6
Accelerator Pedal Position E(%)29.0
Number of DTCs stored in this ECU 0
Calculated LOAD Value(%)32.2
Short Term Fuel Trim -Bank 1(%)-5.5
Engine RPM(rpm) 3702
Ignition Timing Advanced for #1 Cylinder(。)53.5
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.16OBD requirements to which vehicle is designedOBDII
Commanded Evaporative Purge(%)91.0
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.022
Control module voltage(V)14.250
Relative Throttle Position(%)20.0
Absolute Throttle Position B(%)26.3
Commanded Throttle Actuator Control(%)20.4
Fuel system 2 status--
Calculated LOAD Value(%)25.5
Long Term Fuel Trim - Bank 1(%)-1.6
Engine RPM(rpm) 3735
Ignition Timing Advanced for #1 Cylinder(。)42.5
Location of Oxygen SensorsB1S12--B2S----
OBD requirements to which vehicle is designedOBDII
Distance Travelled While MIL is Activated(Km)1
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.209
Control module voltage(V)14.250
Relative Throttle Position(%)18.8
Absolute Throttle Position B(%)25.1
Commanded Throttle Actuator Control(%)18.4
Fuel system 1 statusOL-Drive
Engine Coolant Temperature(。C)84
Long Term Fuel Trim - Bank 1(%)-1.6
Vehicle Speed Sensor(km/h)52
Intake Air Temperature(。C)30
Location of Oxygen SensorsB1S12--B2S----
OBD requirements to which vehicle is designedOBDII
Distance Travelled While MIL is Activated(Km)1
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.002
Control module voltage(V)14.250
Relative Throttle Position(%)22.4
Accelerator Pedal Position D(%)27.1
Commanded Throttle Actuator Control(%)24.3
Fuel System 2 status--
Calculated LOAD Value(%)27.1
Short Term Fuel Trim -Bank 1(%)5.5
Engine RPM(rpm) 3725
Ignition Timing Advanced for #1 Cylinder(。)60.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.14
Time Since Engine Start(sec)581
Distance Travelled While MIL is Activated(Km)1
leared1
Distance since diagnostic trouble codes cleared(Km)Barometric Pressure(kPa)100
Oxygen Sensor Current(Bank 1-Sensor 1)(mA)-0.078
Commanded Equivalence Ratio1.000
Absolute Throttle Position B(%)28.6
Accelerator Pedal Position E(%)26.7
Number of DTCs stored in this ECU 0
Calculated LOAD Value(%)23.9
Short Term Fuel Trim -Bank 1(%)0.8
Engine RPM(rpm) 3741
Vehicle Speed Sensor(km/h)53
Absolute Throttle Position(%)23.1
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.15
Time Since Engine Start(sec)582
Commanded Evaporative Purge(%)30.6
Number of warm-ups since diagnostic trouble codes cBarometric Pressure(kPa)100
Oxygen Sensor Current(Bank 1-Sensor 1)(mA)0.172
Commanded Equivalence Ratio1.000
Absolute Throttle Position B(%)20.8
Commanded Throttle Actuator Control(%)13.7
Fuel System 2 status--
Engine Coolant Temperature(。C)83
Intake Manifold Absolute Pressure(kPa)59.0
Intake Air Temperature(。C)30
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.16
Time Since Engine Start(sec)583
Commanded Evaporative Purge(%)43.5
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.019
Commanded Equivalence Ratio1.000
Absolute Throttle Position B(%)23.5
Commanded Throttle Actuator Control(%)17.6
Fuel System 2 status--
Engine Coolant Temperature(。C)83
Intake Manifold Absolute Pressure(kPa)85.0
Ignition Timing Advanced for #1 Cylinder(。)60.0
0
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
Time Since Engine Start(sec)585
Commanded Evaporative Purge(%)94.1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.013
Absolute Load Value(%)37.6
Ambient air temperature(。C)16
Accelerator Pedal Position D(%)27.1
Number of DTCs stored in this ECU 0
Calculated LOAD Value(%)29.4
Short Term Fuel Trim -Bank 1(%)-0.8
Vehicle Speed Sensor(km/h)50
Intake Air Temperature(。C)30
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.16
Time Since Engine Start(sec)586
Commanded Evaporative Purge(%)92.5
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)0.998
Commanded Equivalence Ratio1.000
Absolute Throttle Position B(%)29.4
Commanded Throttle Actuator Control(%)24.3
Fuel System 2 status--
Engine Coolant Temperature(。C)83
Intake Manifold Absolute Pressure(kPa)94.0
Ignition Timing Advanced for #1 Cylinder(。)58.0
5
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
Time Since Engine Start(sec)587
Commanded Evaporative Purge(%)91.0
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.000
Absolute Load Value(%)58.4
Ambient air temperature(。C)16
Accelerator Pedal Position E(%)32.2
Number of DTCs stored in this ECU 0
Calculated LOAD Value(%)35.7
Short Term Fuel Trim -Bank 1(%)-2.3
Vehicle Speed Sensor(km/h)53
Intake Air Temperature(。C)30
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.14
Time Since Engine Start(sec)589
Commanded Evaporative Purge(%)100.0
leared1
Distance since diagnostic trouble codes cleared(Km)Oxygen Sensor Current(Bank 1-Sensor 1)(mA)-0.051
Commanded Equivalence Ratio0.999
Absolute Throttle Position B(%)87.8
Commanded Throttle Actuator Control(%)23.1
Fuel System 2 status--
Engine Coolant Temperature(。C)83
Intake Manifold Absolute Pressure(kPa)87.0
Intake Air Temperature(。C)31
Location of Oxygen SensorsB1S12--B2S----
OBD requirements to which vehicle is designedOBDII
Fuel Level Input(%)18.8
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)0.995
Absolute Load Value(%)25.1
Relative Throttle Position(%)13.3
Accelerator Pedal Position D(%)24.3
Commanded Throttle Actuator Control(%)15.3
Fuel System 2 status--
Calculated LOAD Value(%)19.2
Long Term Fuel Trim - Bank 1(%)-0.8
Vehicle Speed Sensor(km/h)53
Intake Air Temperature(。C)30
Location of Oxygen SensorsB1S12--B2S----
Short Term Fuel Trim Bank 1-Sensor 2(%)0.0
Distance Travelled While MIL is Activated(Km)1
Number of warm-ups since diagnostic trouble codes cEvap System Vapor Pressure(Pa)-583.75
Oxygen Sensor Current(Bank 1-Sensor 1)(mA)0.035
Commanded Equivalence Ratio1.000
Ambient air temperature(。C)16
Accelerator Pedal Position E(%)27.5
Number of DTCs stored in this ECU 0
Fuel System 2 status--
Engine Coolant Temperature(。C)82
Intake Manifold Absolute Pressure(kPa)94.0
Ignition Timing Advanced for #1 Cylinder(。)59.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.09OBD requirements to which vehicle is designedOBDII
Commanded Evaporative Purge(%)91.8
leared1
Distance since diagnostic trouble codes cleared(Km)Equivalence Ratio (lambda)(Bank 1-Sensor 1)1.013
Control module voltage(V)14.250
Relative Throttle Position(%)22.7
Absolute Throttle Position B(%)29.8
Commanded Throttle Actuator Control(%)24.3
Fuel system 1 statusCL
Calculated LOAD Value(%)27.5
Long Term Fuel Trim - Bank 1(%)-1.6
Engine RPM(rpm) 3720
Ignition Timing Advanced for #1 Cylinder(。)60.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.12
Time Since Engine Start(sec)594
Distance Travelled While MIL is Activated(Km)1
leared1
Distance since diagnostic trouble codes cleared(Km)Barometric Pressure(kPa)100
Catalyst Temperature Bank 1,Sensor 1(。C)632.0
Commanded Equivalence Ratio1.000
Absolute Throttle Position B(%)29.8
Accelerator Pedal Position E(%)27.1
Don't think you can use this data to diagnosis a p0300 (random misfire). It is more for a technician to know how to drive the vehicle to hopefully reproduce misfire.
Looking through the data only thing I notice is when youre in moderate load with pretty high RPMs, your EVAP is purging; with no change to fuel short term trim.
Usually lowers during purge to compensate for this extra incoming fuel. (even see it adding more fuel in the "during" frame)
Not familiar with how Fiats program their EVAP systems so cant say for sure this is an issue.
But hard to blame a random misfire on EVAP purging. Take this all with a grain of salt.
Have you checked with Fiat dealers? any service bulletins with software update for this issue?
I am not doubting your mechanical ability, but were the spark plugs gapped properly and torqued down correctly?
Yes, including new plugs that were gapped to correct standard.
Quote:
Originally Posted by GabAlmighty
Plug wires grounding/shorting out somewhere? Faulty ignition module? ECU could be fried (this one throws you for a loop)?
I have a suspicion it could be electrical or the ECU, the car has no noticeable stumbling or any noticeable feel to the misfire. A shop inspected it as much as they could mechanically and didn't find anything immediate.
Quote:
Originally Posted by Peturbo
Don't think you can use this data to diagnosis a p0300 (random misfire). It is more for a technician to know how to drive the vehicle to hopefully reproduce misfire.
Looking through the data only thing I notice is when youre in moderate load with pretty high RPMs, your EVAP is purging; with no change to fuel short term trim.
Usually lowers during purge to compensate for this extra incoming fuel. (even see it adding more fuel in the "during" frame)
Not familiar with how Fiats program their EVAP systems so cant say for sure this is an issue.
But hard to blame a random misfire on EVAP purging. Take this all with a grain of salt.
Have you checked with Fiat dealers? any service bulletins with software update for this issue?
My next step will be the dealership I guess, I held out for as long as I could.
The vehicle is now out of warranty and at 30,000 KMs ago the engine and turbo were replaced under warranty with a few reflashes done during the repair process by the previous owner. I'll go and see if they have any clue whats going on, hopefully it wont cost an arm and a leg.
You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!
The banners on the left side and below do not show for registered users!
