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Home › Waveforms › 2015 Ford F-150 › Manifold Absolute Pressure Sensor

Manifold Absolute Pressure Sensor

2015 Ford F-150 · 3.5L V6 EcoBoost

1.4V1.1V0.8V1s/div | 1V/divdc-variable
Sensor Type
piezoresistive
Waveform Type
dc-variable
Location
Integrated into intake manifold on rear of engine between cylinder banks, or mounted on firewall with vacuum hose to intake manifold (varies by model year)
Pins
3-pin connector
0
Timebase
1s/div
Voltage Scale
1V/div
Trigger
N/A - DC signal

Wiring

Gray/Orange (5V reference from PCM), Black/Light Blue (signal ground), Gray/White (MAP signal output to PCM)

Expected Voltage Range

At Idle
0.8V to 1.4V
At Higher RPM
4.2V to 4.9V

Expected Pattern

Smooth DC voltage reflecting intake manifold pressure, low at idle (high vacuum), high under boost or WOT, showing turbo boost activity

Known-Good Waveform

MAP sensor outputs 0.8-1.4V at idle representing 8-14 inHg vacuum (0.4-0.6 bar absolute). Key-on engine-off should show approximately 4.5V (atmospheric pressure, ~14.7 psi). Under boost conditions, voltage rises to 4.2-4.9V representing up to 22 psi boost pressure. Signal should be very smooth with minimal ripple. Turbo spooling creates characteristic voltage rise during acceleration.

Common Failure Patterns

Voltage fixed at approximately 4.5V regardless of engine vacuum or boost
Cause: Disconnected or blocked vacuum hose to sensor, failed MAP sensor diaphragm, internally failed sensor
Related DTCs: P0106, P0107, P0108, P0299
Idle voltage too high (above 2.0V) indicating low vacuum reading
Cause: Large vacuum leak in intake manifold, stuck-open PCV valve, failed turbo wastegate stuck open
Related DTCs: P0106, P0171, P0174, P0299
Erratic signal with rapid fluctuations, electrical noise on waveform
Cause: Corroded MAP sensor connector, damaged signal wire, poor ground connection, failing sensor
Related DTCs: P0106, P0108
Lower than expected voltage under boost (below 3.5V at WOT)
Cause: Boost leak in intercooler system, failing turbocharger, stuck wastegate, restricted air filter
Related DTCs: P0299, P0234

Diagnostic Tips

EcoBoost MAP sensor is critical for turbo boost control and fuel delivery calculations. Always verify 5V reference and ground at sensor connector first. Compare MAP reading to barometric pressure at key-on engine-off - should match within 0.2V. Common failure is boost leaks at intercooler connections causing underboost codes P0299.

Related Diagnostic Trouble Codes

P0105P0106P0107P0108P0109
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.

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