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GENERAL => General => Topic started by: RareGMFan on October 30, 2005, 03:38:08 PM

Title: Help diagnosing scanner readings
Post by: RareGMFan on October 30, 2005, 03:38:08 PM
Welp, I finally barrowed a scanner off a guy I met who works for NAPA.  I have it till next Sunday, so I can try this a few times.  I tried to include anything I thought was vital, along with things I noted under different circumstances.  Here is what I got from the initial readings.

Engine off/Ignition in on Position (running 10 minutes prior to this):

Throttle angle - 0%  *Pressing pedal 1/4 - 1/2 way down pushes it to a high of 40?
TPS - .56 vlt  *Pressing pedal 1/4 - 1/2 way down pushes it to a high of 2.86 vlt
Battery -  12.2 vlt
Fuel Pump Sense - 0.0 vlt
Injection Pulse - 9.7 mS  *Pressing pedal 1/4 - 1/2 way down pushes it to 18 mS
Integrator - 124
Spark Advance - 0.0?
Desired A/F Mix - 13.3
O2 Sensor - 233 mvlt
Block Learn - 128
Rich/Lean Flag - Lean
Loop Status - Open
EGR - Off
Knock Retard - 0.0?
Knock Sensor - 19
Idle Air Mtr Pos - 98 steps
Barometric Press - 4.54 vlt
MAP Sensor - 2.33 vlt



Engine running/idling in park:

Throttle angle - 0%
TPS - .56 vlt
Battery - 13.6 - 13.7 vlt
Fuel Pump Sense - 13 vlt
Injection Pulse - 1.1 mS  *Climbs quickly to 3.0 mS, drops way down, then back to 1.1 when pedal lightly pressed
Integrator - 127  *Will not climb over 128, & actually drops to 119 while pedal is still pressed
Spark Advance - 9.8 - 14.7  *Heavy fluctuation at times
Desired A/F Mix - 14.7
O2 Sensor - High 300's - low 700's  *Responsive, heavy fluctuation
Block Learn - 125
Rich/Lean Flag - Fluctuates at idle rapidly, rich when pedal is pressed
Loop Status - Closed
EGR - Off  *Same with gas pressed
Knock Retard - 13.6? - 14.0?
Knock Sensor - Continously starts at 0, counts VERY quickly to 242-253, and starts all over again
Catalytic Temp - 572.0?
Idle Air Mtr Pos - 9 steps  *Jumps quickly to 40+ when pedal is pressed, then back down again
Barometric Press - 4.50 vlt
MAP Sensor - .96 vlt  *Jumps to ~1.17 with light pedal press, then to around .50, & back to .90 - .96



Driving around 20 MPH/occasional heavy throttle:

Throttle angle - 80% max when pushed hard
TPS - 3.33 vlt max when pushed hard
Battery - 13.4 - 13.7
Fuel Pump Sense - 13 vlt  *very small range of fluctuation
Injection Pulse - 8.6 mS max when pushed
Integrator - 128 max at WOT, will hit 130's when you first get back off the gas
Spark Advance - Heavy fluctuation from 12.2? - 16.8? @ a stop, ~25 @ light throttle, full throttle lowers it to 17?
Desired A/F Mix - 14.7
O2 Sensor - Still responsive, hitting the low 900's for a high
Block Learn - Will not pass 128
Rich/Lean Flag - Fluctuates with no throttle, rich when getting on it
Loop Status - Closed
EGR - On for a split second when pushing it, & off again even while pedal is still depressed
Knock Retard - 14.0? steady
Knock Sensor - Still doing the same thing as in park, throttle makes no difference
Catalytic Temp - 599.0?
Idle Air Mtr Pos - 80 steps when pushed
Barometric Press - 4.54 steady
MAP Sensor - 2.68 vlt max

Well, there you have it.  First things that sticks out is the knock sensor, which appears to be going nuts, and may also be causing some of the other off readings.  Then there's the throttle angle/TPS voltage being low (which is also one of the codes I have), and doesn't move when the car is started.  I will try unplugging the TPS and seeing what kind of readings I get (should be default, correct?).  I would have done it today, but the engine was just too damn hot.  The others codes I had before I started were 33, MAP sensor voltage low, and 43, ESC, which is most likely due to the KS.  You can see there is QUITE a bit of KR, which is probably causing shuttering feeling I get (almost like a fuel cut off) when I got on the throttle.  I *think* that's the max timing it will cut.  Is this because of the sensor itself, or is there still a possibility of internal motor problems?  I'm guessing the sensor is fried, or there's a wiring issue since it's still getting a reading even with the engine off.  Anything else stick out to anyone?  If I should conduct any other test while I still have the scanner, do tell.  If you need further clarification on anything, or more info, let me know.  Any help would be super duper appreciated.