P1104
NissanThe Engine Control Module (ECM) has detected an open or short in the ground circuit of the Mass Air Flow (MAF) sensor, indicating an electrical malfunction.
Medium SeverityThis code signifies that the Engine Control Module has detected an electrical fault in the ground circuit of the Mass Air Flow sensor. This malfunction can lead to inaccurate air intake readings, affecting fuel delivery and engine performance.
⚠️ Before You Begin (Safety First)
Always wear appropriate personal protective equipment, such as gloves and eye protection. Before attempting any electrical diagnosis or repair, ensure the vehicle's battery is disconnected to prevent accidental shorts or electrical shock. Allow the engine to cool completely before working on any components.
Common Symptoms
- Check Engine Light illumination
- Rough idle or stalling
- Hesitation or poor acceleration
- Reduced engine power
- Engine running rich or lean
Common Causes
- Damaged, corroded, or loose ground wire for the MAF sensor circuit
- Faulty MAF sensor connector
- Internal MAF sensor failure (though less common for a ground specific code)
- ECM internal fault (rare)
Frequently reported on: Nissan Altima 2002-2006, Nissan Maxima 2000-2003, Nissan Frontier 2005-2008, Nissan Pathfinder 2001-2004
Diagnostic Steps
- Visually inspect the wiring harness leading to the MAF sensor for any signs of damage, fraying, or corrosion, paying close attention to the ground wire.
- Check the MAF sensor electrical connector for bent pins, corrosion, or a loose fit. Clean any corrosion with electrical contact cleaner.
- With the ignition off and battery disconnected, use a multimeter to check for continuity between the MAF sensor ground pin (consult a wiring diagram for the specific pin) and a known good chassis ground.
- If no ground is present or resistance is high, trace the ground wire back to its splice or connection point, checking for breaks or poor connections.
- Reconnect all components, clear the P1104 code using an OBD-II scanner, and test drive the vehicle to see if the code returns.
👨🔧 When to Call a Professional
If after performing basic checks and repairs you are still unable to locate and fix the ground issue, or if the fault is intermittent and difficult to diagnose, it is best to consult a professional mechanic who has specialized diagnostic equipment for electrical system tracing.
Commonly Asked Questions
What does P1104 specifically mean for my Nissan?
P1104 indicates that your Nissan's Engine Control Module (ECM) has detected an electrical problem with the ground circuit of the Mass Air Flow (MAF) sensor, specifically a malfunction in its grounding.
Can I drive my car with a P1104 code?
While it may be possible to drive, it is not recommended for extended periods. The MAF sensor is crucial for engine operation, and a ground malfunction can lead to poor fuel economy, reduced power, and potential stalling. It's best to address it promptly.
Is cleaning the MAF sensor a solution for P1104?
Cleaning the MAF sensor is generally a good maintenance practice, but P1104 specifically points to a ground electrical malfunction, not necessarily a dirty sensor. While it won't hurt, you should focus on inspecting the wiring and connections for the ground circuit.
How can I test the MAF sensor ground circuit at home?
With the battery disconnected and ignition off, you can use a multimeter set to continuity mode. Touch one probe to the MAF sensor's ground pin (refer to your vehicle's wiring diagram) and the other to a known good chassis ground. A reading close to zero ohms indicates a good ground.
What if I can't find a visible problem with the MAF sensor ground wire?
If visual inspection doesn't reveal the issue, the fault might be internal to the wiring harness, a corroded pin within a connector, or a less obvious break. This is when tracing the circuit with a multimeter or consulting a professional becomes necessary.