What wire color is the sensor reference circuit for the MAP, EVP and TP sensors?

Circuit 359, gray/red (GY/R), which also branches to the E4OD transmission (page 30-1) and the VIP Data Link Connector C198.

What is the signal return wire for these sensors?

Circuit 351, brown/white (BR/W), routed through splices S163 and S135 and connector C101 back to the PCM.

What does the TPS do according to this diagram?

It is a potentiometer with a DC output that varies with throttle plate angle; by monitoring TP Sensor output the PCM calculates fuel delivery requirements based on driver demand.

Which PCM pins are shown on this page?

Top-side pins 49, 46, 45, 26, 27 and 47; bottom pins 36, 56, 16 and 4, which lead via circuits 929 PK, 395 GY/O, 259 O/R and 382 Y/BK to the ignition system (page 21-1).

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Ford 4.9L Engine Controls Wiring Diagram - MAP, EVP, TPS & PCM (Page 23-4)

Ford 23-4 Engine Controls 4.9L wiring diagram with MAP, EGR valve position and throttle position sensors

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Engine controls wiring diagram for 4.9L showing manifold absolute pressure, EGR valve position and throttle position sensor circuits.

AI caption August 2018 · Photo 340 of 386

This is page 23-4 of a Ford factory-style wiring diagram covering Engine Controls for the 4.9L engine. It shows the wiring between the Powertrain Control Module (PCM, solid state) and three sensors: the Manifold Absolute Pressure (MAP) sensor at connector C1011, the EGR Valve Position (EVP) sensor at connector C182, and the Throttle Position Sensor (TPS) at connector C1026. Circuit 359 GY/R provides the shared sensor reference, circuit 351 BR/W the shared signal return (through splices S163, S135, S137, S161, S122 and connector C101), circuit 358 LG/BK is the MAP signal, 352 BR/LG the EVP signal, and 355 GY/W the TPS signal through connector C185. PCM pin numbers 49, 46, 45, 26, 27, 47 (top) and 36, 56, 16, 4 (bottom) are labeled, with circuits 929 PK, 395 GY/O, 259 O/R and 382 Y/BK routing to the ignition system (page 21-1). Notes indicate a branch to the E4OD transmission (page 30-1), an 'all except Bronco' branch on circuit 89 O to C103 (not used), and the VIP data link connector C198. Descriptive callouts explain the function of the MAP, EVP and TP sensors and the PCM.

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Frequently asked questions

What sensors are shown on the 4.9L engine controls wiring diagram page 23-4?: The Manifold Absolute Pressure (MAP) sensor at connector C1011, the EGR Valve Position (EVP) sensor at connector C182, and the Throttle Position Sensor (TPS) at connector C1026, all wired to the Powertrain Control Module (PCM).
What wire color is the sensor reference circuit for the MAP, EVP and TP sensors?: Circuit 359, gray/red (GY/R), which also branches to the E4OD transmission (page 30-1) and the VIP Data Link Connector C198.
What is the signal return wire for these sensors?: Circuit 351, brown/white (BR/W), routed through splices S163 and S135 and connector C101 back to the PCM.
What does the TPS do according to this diagram?: It is a potentiometer with a DC output that varies with throttle plate angle; by monitoring TP Sensor output the PCM calculates fuel delivery requirements based on driver demand.
Which PCM pins are shown on this page?: Top-side pins 49, 46, 45, 26, 27 and 47; bottom pins 36, 56, 16 and 4, which lead via circuits 929 PK, 395 GY/O, 259 O/R and 382 Y/BK to the ignition system (page 21-1).