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post #1 of 14 (permalink) Old 11-22-2010, 02:59 PM Thread Starter
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P0068 Throttle Position Correlation

Hi started this morning and rough surging idle then code P0068. Car was undriveable. Air temp about 30 degrees if that matters. That is the MAP sensor code, right?

I just did the MAP sensor two months ago, hardly any mile. Aftermarket autozone. Do we know if there is a problem with their parts? I just pulled off the connector and reattached. Seemes the old owner broke the locking clip, so, maybe it was not tight. THe contacts seem really loose, virtually no resistance to slide on. I taped the connector to the sensor.


2002 2.7.

Last edited by BobbyD; 11-22-2010 at 03:10 PM. Reason: found my old post
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post #2 of 14 (permalink) Old 11-22-2010, 11:11 PM
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check for vacuum leaks up and around the upper intake plenum...it is possible to have a bad lower intake gasket causing the problem too.
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post #3 of 14 (permalink) Old 11-23-2010, 05:45 AM
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Quote:
Originally Posted by TrepCruzin View Post
check for vacuum leaks up and around the upper intake plenum...it is possible to have a bad lower intake gasket causing the problem too.
This usually makes a hissing noise.

Throttle position correlation codes may also indicate a bad throttle position sensor.
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post #4 of 14 (permalink) Old 11-27-2010, 12:36 AM Thread Starter
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Hey,

I replugged the MAP sensor connector and it has cured the problem. Maybe without the locking mechanism on the clip, it worked itself loose. I'll let you know if it acts up again. I used electrical tape to secure the clip on the sensor housing.
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post #5 of 14 (permalink) Old 12-05-2010, 09:40 PM Thread Starter
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Ok, problem back....thought that was too good to be true. It is intermitten. I shut it down and came back later and it ran fine. I would think that would rule out a vacuum leak. Seems like messing with the gas pedal up and down can smooth it out. It likes to be accelerating, doesn't like idle or no throttle, bucks, rough, up and down.
Autozone says that he sells a lot of speed sensors...on the transaxle. A TPS is 80 plus bucks. Expensive if a bad guess.

The MAP sensor I put in was aftermarket.
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post #6 of 14 (permalink) Old 12-06-2010, 08:49 PM Thread Starter
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Map sensor was guaranteed for 2 years and Autozone replaced it. I'll let you know if that cures the problem. It was full of oil and that may have made it malfunction? Maybe that was why it was intermittent, when the oil left it started to function? Seeing this, I replaced the PVC valve, too.
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post #7 of 14 (permalink) Old 04-22-2011, 02:34 PM
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So did this fix it? I have the same issue.
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post #8 of 14 (permalink) Old 04-22-2011, 03:43 PM
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I read thru this thread, seems the throttle position sensor might be bad here.See the bold below

Quote:
Originally Posted by BobbyD View Post
Ok, problem back....thought that was too good to be true. It is intermitten. I shut it down and came back later and it ran fine. I would think that would rule out a vacuum leak. Seems like messing with the gas pedal up and down can smooth it out. It likes to be accelerating, doesn't like idle or no throttle, bucks, rough, up and down.
Autozone says that he sells a lot of speed sensors...on the transaxle. A TPS is 80 plus bucks. Expensive if a bad guess.

The MAP sensor I put in was aftermarket.
That might indicate a bad TPS, recheck connections on both MAP and TPS.

Late!
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post #9 of 14 (permalink) Old 04-25-2011, 04:39 PM Thread Starter
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Hello Diger and Scooter.

No, I still have not fixed it. It seems to be effected by cold weather. The cold mornings it was liklely to occur. Once warmed up, shut off and restart and it seemed to cure itself. Since it is not longer that cold, I have not had it happen in a month. Not good, since it isn't fixed and I'm sure will be a problem by next winter. I even gave up and went to the dealer and he could not find the problem. It would be nice if someone could weigh in with a hard fix. Guess TPS and being wrong is an 80 dollar guess
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post #10 of 14 (permalink) Old 08-30-2011, 09:36 PM Thread Starter
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Hi everyone,

Still have problem from time to time. Newest thing is poor driveability...hesitation from dead stop. Sometimes I'm pressing the gas pedal down to accelerate and nothing happening. I'm thinking just guess the TPS spend the 80 bucks for the part and hope it is fixed? Doing some searches here possibly the EGR valve? There was a post about capping it off, but I would flunk emissions I would think.
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post #11 of 14 (permalink) Old 08-30-2011, 09:41 PM
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Symptom:
P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION
- HIGH FLOW/VACUUM LEAK

When Monitored and Set Condition:
P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION - HIGH
FLOW/VACUUM LEAK
When Monitored: Engine Running, during all drive modes.
Set Condition: The relationship between the MAP and Throttle exceeds a predetermined
value.

POSSIBLE CAUSES

GOOD TRIP EQUAL TO ZERO
VACUUM LEAK
HIGH RESISTANCE IN MAP (K6) 5 VOLT SUPPLY CIRCUIT
RESISTANCE TO GROUND IN MAP (K6) 5 VOLT SUPPLY CIRCUIT
MAP SENSOR
HIGH RESISTANCE IN (K1) MAP SIGNAL CIRCUIT
RESISTANCE TO GROUND IN (K1) MAP SIGNAL CIRCUIT
HIGH RESISTANCE IN (K4) MAP GROUND CIRCUIT
PCM
TP SENSOR OPERATION
HIGH RESISTANCE IN TP SENSOR (K6) 5 VOLT SUPPLY CIRCUIT
RESISTANCE TO GROUND IN TP SENSOR (K6) 5 VOLT SUPPLY CIRCUIT
TP SENSOR
HIGH RESISTANCE IN (K22) TP SIGNAL CIRCUIT
RESISTANCE TO GROUND IN (K22) TP SENSOR SIGNAL CIRCUIT
HIGH RESISTANCE IN TP (K4) SENSOR GROUND CIRCUIT
PCM

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post #12 of 14 (permalink) Old 08-30-2011, 09:46 PM Thread Starter
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Thanks..did the MAP...guess I may as well guess TPS and go put one in.
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post #13 of 14 (permalink) Old 08-31-2011, 05:42 AM
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Quote:
Originally Posted by BobbyD View Post
Thanks..did the MAP...guess I may as well guess TPS and go put one in.
Leave the paper spacer on it when you install.
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post #14 of 14 (permalink) Old 04-05-2014, 03:42 PM Thread Starter
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Hey Guys,

Four years later now and still have the problem...still intermittent. I gave up trying to fix it. I just put up with it for about a day and then it disappears for about a month.
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