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Old 05-31-2011, 01:01 AM   #1 (permalink)
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Default P0068 MAP/MAF Throttle Postion Correlation

Ok... here is the issue and what I am running... Currently running, Mopar 3in intake, intercooler hard piping, AGP race front mount, Greddy type S, MPx throttle body and 93 oct Performance Tune from the Diablo Sport Predator. I am now throwing the P0068 code and when it happens the engine idles extremely steadily at 1400 RPM. When I simply turn the car off and restart it... it goes away.... also when it shows this problem it only is pushing 5 lbs of boost at WOT. When the code is not there... it pushes 19 lbs. I checked.. there is no vacuum leak at all. My only other though is a wiring issue... can anyone please help me?
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Old 05-31-2011, 06:48 AM   #2 (permalink)
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P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION

When Monitored: With the engine running and no MAP Sensor or TP Sensor DTC’s set.

Set Condition: The PCM determines a valid range in which the TP Sensor should be, at a given RPM/Load. The actual TP Sensor voltage is then compared to this value. If the TP Sensor voltage does not fall within the expected range within a predetermined time an error will be detected. Two Trip Fault.

POSSIBLE CAUSES:
GOOD TRIP EQUAL TO ZERO
HIGH RESISTANCE IN MAP (K7) 5 VOLT SUPPLY CIRCUIT
RESISTANCE TO GROUND IN MAP (K7) 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 (K167) SENSOR GROUND CIRCUIT
PCM

Check the throttle position sensor and manifold absolute pressure sensor wiring harnesses first with an Ohm meter then boost leak test to locate any possible vacuum leaks. You can check the MAP sensor by datalogging MAP and TIP with the engine off to make sure they read similar values (~95-105kPa).

Last edited by NorthNJSRT4; 05-31-2011 at 06:53 AM.
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