P0068 – Manifold Absolute Pressure (MAP)/Mass Air Flow (MAF) – Throttle Position Correlation

P0068 – Manifold Absolute Pressure (MAP)/Mass Air Flow (MAF) – Throttle Position Correlation
P0071 – Ambient Air Temperature Sensor Circuit Range/Performance
P0072 – Ambient Air Temperature Sensor Circuit Low
P0073 – Ambient Air Temperature Sensor Circuit High
Description:                 The DTC indicates the sensor signal is greater than the self-test maximum.
Possible Causes:       
 
AAT circuit open or short to voltage
Damaged AAT sensor
Diagnostic Aids:          An AAT sensor reading greater than the self test maximum with ignition ON engine OFF or during any engine operating mode indicates a concern is present.
Description:                 The powertrain control module (PCM) monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during a key ON, engine running (KOER) self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a DTC is stored in continuous memory.
Possible Causes:       
 
Air leak between MAF sensor and throttle body.
 
Damaged MAF sensor
TP sensor not seated correctly
Damaged TP sensor
Diagnostic Aids:          Diagnose any MAF or TP DTCs first. For Fiesta, if the throttle plate is closed and the LOAD PID is greater than 35%, or with the TP_REL PID at 28% with the LOAD PID less than 30% indicates a concern is present. For all others, if the throttle plate is closed and the LOAD PID is greater than 55%, or with the throttle plate at wide open throttle (WOT) with the LOAD PID less than 30% indicates a concern is present.
Application Key On Engine Off Key On Engine Running Continuous Memory
Ranger GO to Pinpoint Test DH.
All others GO to Pinpoint Test DV.
Description:                 The powertrain control module (PCM) continuously monitors this sensor for concerns. This DTC sets when the ambient air temperature (AAT) sensor reading does not correlate with the other temperature sensor readings at ignition ON. The PCM runs this logic after an engine off and a calibrated soak period, typically 6 – 8 hours. This soak period allows the AAT sensor and the other temperature sensors to stabilize and not differ by more than a calibrated value, typically 18°C (32.4°F).
Possible Causes:       
 
Damaged AAT sensor
Diagnostic Aids:          Make sure the AAT sensor reading and the other temperature sensor readings are similar when the engine is cold and the vehicle has not been in direct sun light.
Description:                 The DTC indicates the sensor signal is less than the self-test minimum.
Possible Causes:       
 
AAT circuit short to ground
Damaged AAT sensor
Diagnostic Aids:          An AAT sensor reading less than the self test minimum with ignition ON engine OFF or during any engine operating mode indicates a concern is present.
Related Topics  P00BA - Low Fuel Pressure Forced Limited Power

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