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Old 08-27-2005, 19:01   #1 (permalink)
John Shepardson
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Can 02 Mustang show which cylinder misfires on scanner?

I have an autotap OBD scanner with Ford parameters I am using with my
2002 GT.

I can see that the Ford generic parameters include ³Cumulative Cylinder
#1 Misfires², ³Cumulative Cylinder #2 Misfires², etc. through all 8,
but they don¹t show up on my list.

There are a lot of diagnostic parameters relating to engine misfire that
I can read on my scanner, but none of them indicate which cylinder is
misfiring.

Thanks for any help,

John
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Old 08-27-2005, 20:01   #2 (permalink)
Jim Warman
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Re: Can 02 Mustang show which cylinder misfires on scanner?

I'm not familiar with your scanner but do you have any misfire codes? Fords
WDS has the ability to use CPS data to determine misfiring cylinders.

AFAIK, using the supplied scan tools, we have no way of reading cummulative
misfire data. There are two different misfire conditions. Class A misfires
will start the CEL flashing, trigger Failure Mode Effects Management and
will generally cause the PCM to shut down the fuel injectors on the affected
cylinders to prevent catalyst damage. Class B misfires will merely set the
CEL and set a code. Sorry I can't remember the exact distinction between
misfire classes... by the time I get them, it doesn't matter, the customer
merely wants it's fixed.


"John Shepardson" <j.shepardson@comcast.net> wrote in message
news:j.shepardson-1AF16F.17091627082005@comcast.dca.giganews.com...
> I have an autotap OBD scanner with Ford parameters I am using with my
> 2002 GT.
>
> I can see that the Ford generic parameters include ³Cumulative Cylinder
> #1 Misfires², ³Cumulative Cylinder #2 Misfires², etc. through all 8,
> but they don¹t show up on my list.
>
> There are a lot of diagnostic parameters relating to engine misfire that
> I can read on my scanner, but none of them indicate which cylinder is
> misfiring.
>
> Thanks for any help,
>
> John



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Old 08-28-2005, 18:01   #3 (permalink)
John Shepardson
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Re: Can 02 Mustang show which cylinder misfires on scanner?

Thanks Jim,

You can see all Ford parameters at this page;
http://www.autotap.com/enhanced_parameters_ford.asp

When my scanner starts up, it communicates with the pcm and it reports
that it can display only the parameters at the end of this email (not
the full Ford list).

My scanner does not show any DTCs, but my car is obviously misfiring.

Most of my misfire related codes do not show anything , but I have found
that ³Low Word of Cumulative Misfires² corresponds very closely to the
stumbling that I am experiencing when I give it the gas. It shoots up
every time my car is running roughly.

I have noted that when it misfires the parameter Fuel System Status Bank
1 is set to OL-1 instead of CL-1, or closed loop which it normally runs
in.

I guess I don¹t know what I¹m doing, but I was expecting that my scan
tool would be more helpful to show what is going on.

John


0.020" dia idle evap leak check Run Always reads NO
0.020" dia idle evap leak check completed Always reads NO
0.20" dia idle evap leak check not allowed Always reads NO
4x4 Low This always reads 4x2
A/C Clutch Read off with A/C off
A/C Pressure Switch Open
Active Axle Ratio Always 3348 : 1
Active Tire Size Always 812
Air Conditioning Cycling Switch Off with a/c off
Anti-scan enabled and counting ??? Always Disabled
ACCESS TIMED
AIR RIDE CTRL-FAULT No
AUTO RIDE CTRL STATUS OFF
Absolute Throttle Position Sensor % Read 20 - 92
Absolute Throttle Position Sensor Voltage Read 0.9 to 4.5 Volts Same
pattern as above
BANK 1 UPSTREAM HEGO VOLT Strange chart ­ always less than 1 then
>60 at 4 points

BANK 2 UPSTREAM HEGO VOLT MUCH Different than ^ Varies from 0 to
1
Barometric Pressure Seems to always read 103.3 kPa
Battery Voltage
Brake On/Off Switch Always off
CFCIL Always off
CID SNES FAIL MODE
CONTINUOUS DTC COUNTER
Canister purge requested
Canister purge solenoid output driver fault
Catylyst Monitoring Status
CLUTCH SOL 3/2 TIMING PRES
Calculated Engine Load
Canister Vent Solenoid Duty Cycle
Check Fuel Cap Light Fault
Closed throttle position
Coast Clutch
Currently misfiring Log
Comprehensive component Monitoring Status
May be componentss monitor completed this driving cycle
Cumulative Misfires LOG
EGR DPFE sensor input at the time of misfire Always 1
HER System Monitoring Status
EGR System in Failure Mode
EVAP monitor soak time conditions have been met
EVR output driver fault (Open)
EVR output driver fault (Short)
Engine load at the time of misfire
Engine rpm at the time of misfire
Engine running time at the time of misfire (blanked on autotap
readout?)
Evaporative system monitoring Status (completed this driving cycle)
Engine-off soak time at the time of misfire
Fuel System Monitoring Status
Fuel Tank Pressure Sensor Failure
IAC output fault (Short to Ground)
IAC output fault (Short to Load)
Idle Speed Control Operating Mode
In Gear during time of misfire
Intake air temperature at the time of misfire
MIL
Maximum Intermittent HEGO B1S1 Fault Filter Value
Maximum Intermittent HEGO B1S2 Fault Filter Value
Maximum Intermittent HEGO B2S1 Fault Filter Value
Maximum Intermittent HEGO B2S2 Fault Filter Value
Misfire Monitoring Status
Misfire wheel profile learned in KAM
Number of trips since the time of misfire
O2 Sensor Heater Monitoring Status
O2 Sensor Monitoring Status
OBDII Trip Completed
Open Loop
PCM_ID
PCM_VFY
Throttle Position at the time of misfire
Total number of on-demand codes
Vehicle speed at time of misfire
Duty Cycle for Fuel Pump Control Output
EGO 21 FLT
EGO11 FLT
EGR Duty Cycle
EGR Sensor Voltage
ENG ENABLE IN
ENG OIL TEMP FAULT DETECTED
EVAP monitor soak time conditions have been met
Engine Coolant Temperature
Engine Coolant Temperature Voltage
Engine Speed
FAN SECONDARY CKT MONITOR
FLEX FUEL SENS ON/OFF
FLEX FUEL-ALCOHOL CONTENT LEARNED
FUEL CNTRL STATE
FUEL PUMP MONITOR ON/OFF
FUEL PUMP OUT FAULT DETECTED
Fuel Pressure
Fuel Pressure (gage)
Fuel Pump Monitor Duty Cycle
Fuel Rail Pressure
Fuel Rail Pressure Transducer Raw Input
Fuel System Status Bank 1
OL-1 Vehicle has not reached conditions to go to closed loop. It will
stay in this mode until vehicle warms up
OL-2 Because of driving conditions, vehicle is no longer using oxygen
sensors for feedback
OL-3 Because a fault has occurred, the vehicle is no longer using o2
sensors for feedback
CL-1 Vehicle has warmed up and is running normally using the o2
sensors to control the fuel mixture. This is
the normal operating mode.
CL-2 Vehicle is warmed up and using o2 sensors for feedback, but there
is a fault with at least one O2 sensor


Fuel Tank Level
Fuel Tank Pressure
Fuel Tank Pressure Voltage

HO2S11 Voltage
HO2S11 actual heater status
HO2S11 actual heater commanded
HO2S11 actual heater current
HO2S11 heater output driver fault

HO2S12 Voltage
HO2S12 actual heater status
HO2S12 actual heater commanded
HO2S12 actual heater current
HO2S12 heater output driver fault

HO2S21 Voltage
HO2S21 actual heater status
HO2S21 actual heater commanded
HO2S21 actual heater current
HO2S21 heater output driver fault HO2S11 Voltage

HO2S22 Voltage
HO2S22 actual heater status
HO2S22 actual heater commanded
HO2S22 actual heater current
HO2S22 heater output driver fault

High Speed Fan
INTAKE MANIF RUN CONT FAULT DET
INTAKE MANIF TUNING VALV CONT FAULT
INTAKE MANIFOLD RUN CTRL
INTAKE MNFLD TUNING VALV VAC CTRL
Idle Air Control or Idle Speed Duty Cycle
Ignition Timing Advance
Info for CARB Verification of Adaptive Fuel pump Monitor
Info for CARB Verification of Adaptive Fuel pump Monitor
Intake Air Temperature
Intake Air Temperature Voltage or Air Charge Temperature
LOW SPD FUEL PUMP FAULT DETECTED
LOW-SPD VAN OUT FAULT DETECTED
Long Term Fuel Trim Bank 1
Long Term Fuel Trim Bank 2
Low Speed Fan
Low Word MIS_NOCALL
Low Word Total Cylinder Events
Low Word of Cumulative Misfires
MALF INDICATE LMP OUT FAULT DET
MASS AIR FLOW RATE
MASTER KEY PRESENT
MED FAN SPD FAULT
MED FAN SPD REQ ON
MIS_NOCALL Cyl Events
Mass Air Flow Rate
Mass Air Flow sensor voltage
Module User RAM Start Address
Neutral/Drive Input
O2 Sensor - Bank 1 Sensor 1 (mV)
O2 Sensor - Bank 1 Sensor 2 (mV)
O2 Sensor - Bank 2 Sensor 1 (Volts)
O2 Sensor - Bank 2 Sensor 1 (mV)
O2 Sensor - Bank 2 Sensor 2 (Volts)
O2 Sensor - Bank 2 Sensor 2 (mV)
O2S DOWNSTREAM HTR CTRL
OBD Requirements
OPEN LOOP FUEL STATUS
PATTERN SELECT SW STATE
PRES CNTRL FLT
PROFILE IGN PICKUP
Park/Neutral Position
Power Steering Load
Power Take Off
Purge Duty Cycle
Rear O2 Fuel Trim, Bank 2
Rear O2 Fuel Trim, Bank1
Register Address for ALC_STRT_KAM
SECONDARY AIR FAULT INDICATOR
SECONDARY AIR MONITOR
SECONDARY THROT (TC) FAULT Always no
SERVMOD Always no
SOFTWARE OCTANE ADJUST Always noanyt
SPARE KEY PROGRAMMING Always Disabled
Spare Key Programming Always Enabled
SW4x4L Always Off
Security Access Time Always 0
Shift Solenoid 1 Always Off
Shift Solenoid 2 Always Off
Shift Solenoid 3 Always Off
Short Term Fuel Trim Bank 1 Always -95
Short Term Fuel Trim Bank 1 Always O
Short Term Fuel Trim Bank 1 Makes a chart, varies little
Short Term Fuel Trim Bank 2 Makes a chart, varies
Short Term Fuel Trim from O2 Bank 1 Sensor 1 Makes a chart, varies
Short Term Fuel Trim from O2 Bank 1 Sensor 2 Stuck at 99.2
Short Term Fuel Trim from O2 Bank 2 Sensor 1 Makes a chart, varies
Short Term Fuel Trim from O2 Bank 2 Sensor 2 Stuck at 99.2
Spark Advance
TC AVAILABLE Always ON
TCASE Always reads ESOF
TCC
TRANS RANGE SENS-DIGITAL
TRANSAXLE RATIO LEARNED
TRANSMISSION CNTRL SW FLAG
The Secondary Air Injection
Throttle Mode
Throttle Position Angle
Time Since Engine Start
Total Cylinder Events
Trans control indicator light
Transmission Control Switch
Transmission Output Shaft Speed
VEH ENABLE STATUS
Vapor Management Valve Output State Monitor
Variable Speed Fan Fault
Vehicle Speed
WOT A/C CUTOUT PRIMARY CKT FAULT
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Old 08-28-2005, 21:01   #4 (permalink)
Jim Warman
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Re: Can 02 Mustang show which cylinder misfires on scanner?

With some experience and a little help from autotap, I have no doubts your
scan tool will proove very useful. Some of our problem is the mix of
terms.... Our Ford scan tools list various loop conditions.... Open loop
drive is enabled when we go to wide open throttle, it is also enabled
briefly after a WOT event to act as a cool down cycle for the cat. Open
loop-fault is pretty self explanatory. Closed loop drive and closed loop
fault are also self explanatory....

I'm not sure how your OL-1 and CL-1 figure in to this. I'm sure that there
should be something in your documentation or assistance would be available
from the manufacturer to help clear this part. Autotap may also be helpful
in interpreting their misfire data...



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