P1107
ToyotaManifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage. This indicates that the Engine Control Module (ECM) detected an intermittent low voltage signal from the MAP sensor circuit, falling outside the expected operating range.
Medium SeverityThis code means your vehicle's Manifold Absolute Pressure (MAP) Sensor is sending an intermittently low voltage signal to the engine computer. This can lead to the engine receiving incorrect information about manifold pressure, affecting fuel mixture and engine performance.
⚠️ Before You Begin (Safety First)
Always disconnect the battery before working on electrical components. Ensure the engine is cool to prevent burns. Wear appropriate personal protective equipment, such as gloves and eye protection.
Common Symptoms
- Check Engine Light illumination
- Rough idle or stalling
- Poor fuel economy
- Hesitation or lack of power during acceleration
- Engine running rich or lean
- Difficulty starting the engine
Common Causes
- Faulty MAP sensor
- Damaged or corroded wiring in the MAP sensor circuit
- Loose or corroded electrical connectors
- Vacuum leaks in the intake manifold affecting MAP sensor readings
- Contamination or blockage in the MAP sensor port
- Faulty Engine Control Module (ECM) (less common)
Frequently reported on: Toyota Corolla 2000-2008, Toyota Camry 1997-2001, Toyota Tacoma 1995-2004, Toyota Tundra 2000-2006
Diagnostic Steps
- Locate the MAP sensor (typically on the intake manifold or connected via a vacuum line).
- Inspect the electrical connector for corrosion or damage. Clean if necessary.
- Examine the wiring leading to the MAP sensor for any visible cuts, chafing, or signs of heat damage.
- Check for any vacuum leaks around the intake manifold or the hose connected to the MAP sensor.
- If no obvious wiring or vacuum issues are found, consider testing the MAP sensor's voltage output with a multimeter if you have the proper vehicle specific voltage specifications.
- If the sensor is suspected to be faulty, disconnect the old sensor and install a new one. Ensure it's the correct part for your vehicle.
- Clear the P1107 code using an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If replacing the MAP sensor does not resolve the issue, or if you suspect wiring damage, it's best to consult a professional. Diagnosing intermittent electrical issues can be complex and may require specialized tools.
Commonly Asked Questions
What does 'intermittent low voltage' mean for my MAP sensor?
It means the sensor's electrical signal drops below the normal operating range inconsistently, rather than being constantly low. This can make diagnosis tricky.
Can I drive with a P1107 code?
While you might be able to drive, it's not recommended for long. A faulty MAP sensor can cause poor engine performance, reduced fuel economy, and potentially lead to other engine problems if ignored.
Is the MAP sensor hard to replace?
For most Toyota models, replacing the MAP sensor is relatively easy and involves disconnecting an electrical connector and removing one or two bolts. No special tools are usually required.
What's the difference between a MAP sensor and a MAF sensor?
A MAP sensor measures pressure inside the intake manifold to determine engine load. A MAF (Mass Air Flow) sensor measures the amount of air entering the engine. Both are crucial for fuel delivery calculations.
Could a vacuum leak cause P1107?
Yes, a vacuum leak can cause the intake manifold pressure to be different than what the ECM expects, which might indirectly lead to the MAP sensor reporting an out-of-range value, including an intermittent low voltage condition.