🚨 Code P1104: MAP Sensor / Circuit Problem
🔧 Definition
Code P1104 indicates a malfunction related to the MAP sensor (Manifold Absolute Pressure) or its circuit. This sensor transmits pressure data to the engine control module (ECM) to optimize fuel mixture. Some vehicles also use a MAP/BARO Switch solenoid valve to switch the air flow.
⚠️ Symptoms
- 🚨 Check Engine Light on (or about to come on).
- Unstable idle or loss of power.
- Abnormal fuel consumption.
🔍 Possible Causes
| 🛠️ Faulty MAP Sensor | Internal failure or incorrect readings. |
| 🔌 Damaged MAP Circuit | Cut wires, short circuit, or corrosion. |
| 🤝 Faulty Electrical Connection | Oxidized connector, bent pins, or loose connection. |
| 🤖 Faulty ECM | Rare, but to be checked as a last resort. |
🛠️ Solutions
- 🔎 Inspect the Circuit and Connectors
- Check the MAP sensor harness for exposed wires, burns, or corrosion.
- Inspect the connector pins (broken, bent, or dirty).
- 📏 Test the MAP Sensor
- Use a multimeter to measure voltage and resistance (compare to manufacturer specifications).
- Replace the sensor if values are out of range.
- 🔌 Check the MAP/BARO Switch Solenoid Valve
- Test its operation with a diagnostic tool.
- Ensure it correctly switches the air flow.
- ⚡ Check the Circuit Power and Ground
- Verify the supply voltage (usually 5V) and the sensor ground.
- 🔄 Reset the ECM
- Clear the P1104 code with an OBD-II scanner. If the code returns, continue testing.
- 🤖 Diagnose the ECM
- If suspected, consult a professional for an in-depth test.
💡 Pro Tip
If the MAP sensor and its circuit are working correctly, but the code persists, the problem might be a vacuum leak in the manifold or a fault in the intake system. Inspect hoses and gaskets to rule out these causes!
🔋 Key Takeaway
The MAP sensor is crucial for the air-fuel balance. A failure can lead to poor performance and excessive consumption. Act quickly to avoid damaging the catalytic converter!