P0106 - Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance (P0106). The reported signal is electrically valid but disagrees with other operating parameters (RPM, load, or other sensors).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance – Signal Voltage | Voltage (V) | 0.50 - 4.50 V (tracks operating range) | Ignition ON, connector engaged |
| 5 V Reference Voltage | Voltage (V) | 4.95 - 5.05 V | Ignition ON at sensor connector |
| Sensor Ground Voltage Drop | Voltage (V) | < 0.05 V (< 50 mV) | Under load to chassis ground |
| Signal Wire Continuity | Resistance (Ω) | < 0.5 Ω (Open = OL) | Disconnected harness between sensor and ECM |
Ignition ON, connector engaged
Ignition ON at sensor connector
Under load to chassis ground
Disconnected harness between sensor and ECM
Oscilloscope Waveform Analysis
100 ms/div, 1 V/divPossible Causes
Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance is electrically operational but performing outside calibrated tolerance
Chafed or pinched wiring harness along the signal path to Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance
Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance
Defective internal output driver or reference circuit in the control module for Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance
Symptoms
4
Recommended Solution
Log component live data across varying load points and verify plausibility against engine target model.
Verify loaded supply voltage and harness terminal pins at Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance.
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Manifold Absolute Pressure Sensor (MAP) / Barometric Pressure Sensor (BARO) Range/Performance.
Unplug the sensor:the signal must swing to a known rail. Replace the sensor or repair the wiring based on the result.
Mechanic's Tip
Always run a loaded voltage-drop test on the sensor ground with ignition ON. A drop above 0.1 V shifts the whole signal and tricks the module into setting sensor codes on a good sensor.