2008 Saturn Aura P0068 With Freeze Frame Data

[Fishinguy40]

Daughter called last night and said the car was running really bad. She could only go 10mph and dash lights lit up. Service traction control and reduced engine power.

I drove out to where she was and plugged in a Bluetooth ELM327 code reader that works with my Android phone. The code P0068 - Throttle Position Correlation came up. No other codes. Naturally the car started and ran fine as I drove it back home. I suspect the TPS but understand that it could also be the MAF or MAP sensor too. I will disassemble the air intake and inspect for blockage and possible vacuum leaks.

My question is, how can I determine which sensor it is if I don't find any vacuum leaks or other mechanical issue? There was data stored along with the code such as engine load, etc. I can't remember everything. And I cannot access that data now. I will have to reconnect to the car and pull the code again to see it. These Bluetooth ELM327 code readers allow you to view real time data but I'm not sure how to interpret much of it. Looking for some insight.

Freeze Frame Data:

Note the Evap System Pressure in Bold. Is that normal?

Ambient Temp 37F

Accelerator Pedal Position 15.29%

Commanded Throttle Actuator 43.52%

Barometric pressure 0.9279 Atm

Short Term Fuel Trim Bank 1 13.28%

Relative Throttle Position 29.41%

Commanded Evap Purge 100%

Absolute Load Value 30.98%

Engine Coolant Temp 190F

Intake Manifold Absolute Pressure 0.8983

Vehicle Speed 56 MPH

Long Term Fuel Trim Bank 1 17.18%

Catalyst Temp Bank 1 1558F

Mass Air Flow 38.36 g/s

Absolute Throttle Position B 43.13%

Calculated Engine Load 91.76%

Command Equivalence Ratio 1.0 N/A

Timing Advance 38.0

Engine RPM 2308

Throttle Position 43.13%

Intake Air Temp 46F

Fuel System Status Closed Loop Using O2

Evap System Vapor Pressure -76.4165 Atm *E-03

Accelerator Pedal Position D 31.37%

Fuel Level Input 37.64%

[Macgyver55]

Quote:

Throttle Position 43.13%

Accelerator Pedal Position D 31.37%

Engine RPM 2308

Were you revving the motor when you took these readings or driving down the road?

If not, these would appear to be incorrect readings.

[Scott K]

Quote:

Vehicle Speed 56 MPH

[Macgyver55]

Oops, missed that, I was looking at the one in bold and noticed the others close to it. Either way some of the other numbers dont really jive. like Calculated Engine Load 91.76% at 56 mph

[Scott K]

This is the one that caught my eye. I would be looking for a plugged air filter, or a bad maf

Quote:

Calculated Engine Load 91.76%

[Jeremy airjer W]

isn't map sensor voltage low for the amount of throttle and rpm?

[leech~~]

I have a 2009 Saturn Vue and had the same code about a month ago with the same damage control speed around 10mph and chugging issues. I always have a code reader in the SUV. Pulled into a gas station, through in a bottle of ISO and Injector cleaner. Cleared the code, started it up, let it idle for a few minutes and it has never come back yet? I have had these little motor hick ups on a few SUV's and did the same thing to them and have never taken one in to a shop to get fixed for anything. But it seems to work for me?

[Fishinguy40]

My daughter was driving the car when it happened. The freeze frame data was stored with the code. What readings don't look right? The air filter doesn't look bad but easy enough to change. Because it happened and hasn't happened since, I'm assuming a senor is going or something electrical.

[Fishinguy40]

The code reader reads everything in engineering units not voltage. The manifold pressure is in atmosphere not voltage.

[Fishinguy40]

After doing some more digging. The MAP pressure 0.89 atmospheres converts to 26.6 inches of mercury vacuum. Is that high? Seems vacuum should be 15 - 22 inches.

[leech~~]

My daughter was driving the car when it happened. The freeze frame data was stored with the code. What readings don't look right? The air filter doesn't look bad but easy enough to change. Because it happened and hasn't happened since, I'm assuming a senor is going or something electrical.

I was driving mine at 60 mph and it didn't act up until I hit the off ramp.

[Fishinguy40]

I left the Bluetooth device plugged in as I drove the car home and was able to achieve over 90% engine load easily when I was accelerating.