A Manifold Absolute Pressure (MAP) sensor is a vital component in modern automotive engines, playing a pivotal role in optimizing fuel injection, ignition timing, and emissions control. By measuring the pressure within the intake manifold, the MAP sensor provides real-time data to the Engine Control Unit (ECU), enabling precise adjustments to air-fuel ratios under varying load conditions. This ensures efficient combustion, reduced emissions, and improved engine performance.

Key Functions of MAP Sensors

1. Pressure Measurement: MAP sensors detect absolute pressure in the intake manifold, which fluctuates with throttle position and engine load.

2. ECU Communication: The sensor converts pressure readings into voltage signals, guiding the ECU to regulate fuel delivery and spark timing.

3. Turbo/Supercharger Support: In forced-induction engines, MAP sensors monitor boost pressure to prevent overloading and detonation.

Common MAP Sensor OEM Codes Across Vehicles

MAP sensor designs and OEM codes vary by manufacturer, engine type, and model year. Below are notable examples:

• Nissan/Infiniti:

  • OEM Code: 22693-XXXXX (e.g., 22693-5LA0A for Nissan Q50 3.0T)

  • Application: Turbocharged engines requiring precise boost pressure monitoring.

• Toyota/Lexus:

  • OEM Code: 22204-22010 (e.g., Toyota Camry 2.5L)

  • Feature: Integrated temperature compensation for accuracy in extreme climates.

• Ford:

  • OEM Code: F7TZ-9F479-A (e.g., Ford F-150 EcoBoost 3.5L)

  • Compatibility: Designed for high-torque engines with dual turbochargers.

• BMW:

  • OEM Code: 13628637905 (e.g., BMW 330i B48 engine)

  • Technology: Combines pressure sensing with digital signal processing for ECU integration.

• Honda:

  • OEM Code: 37870-R70-A01 (e.g., Honda Accord 1.5T)

  • Durability: Resistant to vibration and heat in compact turbo setups.

• Chevrolet/GM:

  • OEM Code: 12670234 (e.g., Chevrolet Silverado 6.2L V8)

  • Application: Heavy-duty engines requiring robust pressure tracking.

Symptoms of a Faulty MAP Sensor

A malfunctioning MAP sensor can trigger issues such as:

• Poor fuel economy

• Rough idling or hesitation

• Illuminated Check Engine Light (CEL) with codes like P0106 (range/performance) or P0107 (low voltage).

Maintenance and Replacement Tips

1. Diagnostics: Use an OBD-II scanner to confirm error codes before replacement.

2. Genuine vs. Aftermarket: OEM sensors ensure compatibility, while brands like Bosch or Delphi offer reliable alternatives.

3. Installation: Clean the intake manifold port to prevent debris interference.

Conclusion

MAP sensors are indispensable for balancing performance and efficiency in both naturally aspirated and turbocharged engines. Understanding their OEM codes and specifications is critical for accurate diagnostics and repairs. Always cross-reference sensor codes with the vehicle’s VIN or service manual to ensure optimal functionality.