Hi, there is a post here on this issue: http://www.fordf150.net/forums/viewtopic.php?t=50060&highlight=p2104
Fig. 5.4L APP sensor connector
Fig. APP Diagnostic resistance chart
Since you have already changed the TPS, I assume you also cleaned the throttle body? Is the throttle actuating smoothly? If not, make any repairs needed to make it smooth and easy to rotate the throttle.
If the throttle is good, then test the accelerator position sensor per the procedure below.
Please let me know if you have any questions, and thanks for using FixYa.
OperationThe APP sensor is an
input to the powertrain control module (PCM) and is used to determine
the torque demand. There are 3 pedal position signals in the sensor.
Signal 1, APPS1, has a negative slope (increasing angle, decreasing
voltage) and signals 2 and 3, APPS2 and APPS3, both have a positive
slope (increasing angle, increasing voltage). During normal operation
APPS1 is used as the indication of pedal position by the strategy. The 3
pedal position signals make sure the PCM receives a correct input even
if 1 signal has a concern. There are 2 reference voltage circuits and 2
signal return circuits for the sensor.
Removal & Installation
To install:
Testing
Turn the ignition switch to the off position.
Disconnect the Accelerator Pedal sensor connector.
Measure the voltage between pin 6, 7 (ETCREF+) and 1, 3 (ETCRTN-).
The voltage should read between 4-6 volts, If not repair circuits in question.
Turn the ignition off.
Disconnect the Accelerator Pedal sensor connector.
Refer to Resistance Chart:
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