2017 Dodge Durango Evap System Diagram

Let's dive into the 2017 Dodge Durango's Evaporative Emission (EVAP) system. Having a good understanding of this system, especially a clear diagram, is crucial for proper diagnosis and repair, ensuring your Durango runs efficiently and complies with emissions regulations. This article will break down the system, explain the diagram, and give you practical tips for troubleshooting. We have the full high-resolution diagram available for download, which you will find a link to at the bottom of this article.

Purpose of Understanding the EVAP System Diagram

The EVAP system diagram serves as a blueprint for your vehicle's fuel vapor control. Knowing this diagram's details empowers you to:

Diagnose Problems Accurately: Pinpoint faulty components, saving time and money.
Perform Repairs Confidently: Understand the system's layout before replacing parts.
Enhance Your Knowledge: Gain a deeper understanding of your Durango's engineering.
Comply with Emissions Standards: Ensure your vehicle meets environmental regulations.

Whether you're dealing with a pesky check engine light (CEL), diagnosing a fuel smell, or simply want to learn more about your vehicle, this diagram is your best friend.

Key Specs and Main Parts of the 2017 Durango EVAP System

The 2017 Durango's EVAP system is a complex network of components designed to prevent harmful fuel vapors from escaping into the atmosphere. Here's a rundown of the major players:

Fuel Tank: Stores the fuel. The EVAP system's primary job is to manage vapors generated here.
Fuel Cap: Seals the fuel tank and is a crucial component for maintaining system pressure. A loose or damaged fuel cap is a very common source of EVAP errors.
Canister: A charcoal-filled container that absorbs and stores fuel vapors. Think of it as a sponge for fuel fumes.
Canister Vent Solenoid Valve: Controls the flow of fresh air into the canister. This valve allows the engine to draw vapors from the canister when needed.
Purge Valve (Purge Solenoid): Controls the flow of fuel vapors from the canister to the engine's intake manifold. The PCM (Powertrain Control Module, i.e. the car's computer) controls this valve, opening it to allow vapors to be burned during normal engine operation.
Leak Detection Pump (LDP) or Natural Vacuum Leak Detection (NVLD) system: Some Durangos use a dedicated pump, while others rely on natural vacuum. This system pressurizes or draws a vacuum on the EVAP system to check for leaks.
Fuel Tank Pressure Sensor (FTP): Monitors the pressure inside the fuel tank. This sensor provides feedback to the PCM about the integrity of the EVAP system.
Hoses and Lines: Connect all the components, allowing fuel vapors to flow through the system.

Understanding the Symbols in the EVAP System Diagram

The diagram uses specific symbols and conventions to represent the components and their connections. Understanding these symbols is key to interpreting the diagram correctly:

Solid Lines: Typically represent fuel vapor lines. These lines show the paths fuel vapors take throughout the system.
Dotted Lines: Often indicate vacuum lines or signal wires. These lines carry vacuum pressure or electrical signals to control various components.
Colors: Colors might be used to differentiate between different types of lines, such as fuel vapor lines versus control lines. Consult the diagram's legend for specific color coding.
Component Symbols: Each component (e.g., canister, purge valve, FTP sensor) has a unique symbol. Refer to the diagram's legend for a key to these symbols. These symbols are industry standard but might vary slightly between manufacturers.
Arrows: Indicate the direction of flow (either fuel vapor, air, or vacuum).

Always refer to the diagram's legend or key to understand the specific meaning of each symbol and color used. The legend is your decoder ring to understanding the entire system.

How the 2017 Durango EVAP System Works

The EVAP system's operation can be broken down into a few key stages:

Vapor Generation: Fuel vapors are generated in the fuel tank as the fuel heats up and evaporates.
Vapor Storage: These vapors are routed to the charcoal canister, where they are absorbed and stored.
Purging: When the engine is running and certain conditions are met (e.g., engine temperature, speed), the PCM commands the purge valve to open.
Vapor Combustion: Opening the purge valve allows engine vacuum to draw fresh air through the canister vent solenoid, pulling the stored fuel vapors from the canister into the engine's intake manifold.
Leak Detection: Periodically, the PCM initiates a leak test. This typically involves sealing the EVAP system (closing the vent valve) and either pressurizing or drawing a vacuum on the system. The FTP sensor monitors the pressure. If the pressure doesn't hold steady, it indicates a leak.

The system constantly monitors itself using various sensors. If a fault is detected (e.g., a leak, a malfunctioning valve), the PCM will illuminate the check engine light (CEL) and store a diagnostic trouble code (DTC).

Real-World Use: Basic Troubleshooting Tips

Here are some common EVAP system problems and how to approach them:

Check Engine Light (CEL) with EVAP Codes (P0440, P0441, P0455, etc.): This is the most common symptom. Use an OBD-II scanner to retrieve the DTC(s). The code will provide a clue as to the location of the problem. Common culprits include a loose gas cap, a faulty purge valve, a leaking hose, or a cracked canister.
Fuel Smell: A fuel smell, especially after filling up the tank, can indicate a leak in the EVAP system. Inspect the hoses, fuel cap, and canister for signs of damage or leaks.
Difficulty Starting: In rare cases, a malfunctioning purge valve that is stuck open can cause a vacuum leak, making it difficult to start the engine.
Poor Fuel Economy: While less common, a malfunctioning EVAP system can contribute to poor fuel economy.

Troubleshooting Steps:

Read the Codes: Use an OBD-II scanner to retrieve the DTC(s).
Inspect the Gas Cap: Ensure it's tight and in good condition. Replace if necessary.
Visual Inspection: Carefully inspect all hoses and connections for cracks, leaks, or damage. Pay close attention to the area around the canister, purge valve, and FTP sensor.
Smoke Test: A smoke test is a very effective way to locate leaks in the EVAP system. This involves injecting smoke into the system and observing where it escapes.
Component Testing: Use a multimeter or scan tool to test the functionality of the purge valve, vent valve, and FTP sensor.

Safety Precautions

Working with the EVAP system involves handling fuel vapors, which are flammable and potentially hazardous. Here are some crucial safety precautions:

Work in a Well-Ventilated Area: Ensure adequate ventilation to prevent the accumulation of fuel vapors.
No Smoking or Open Flames: Absolutely no smoking or open flames near the work area.
Disconnect the Battery: Disconnect the negative battery cable before working on any electrical components.
Wear Safety Glasses: Protect your eyes from fuel splashes or debris.
Fuel System is Pressurized: The fuel system may be pressurized. When disconnecting fuel lines, relieve pressure slowly and carefully to avoid fuel spraying.
Canister: The canister contains charcoal which can be an irritant if inhaled or ingested.

Pay special attention to the fuel tank and any components directly connected to it. Fuel vapors are highly flammable and can pose a serious fire hazard. If you are uncomfortable working with fuel systems, it is best to consult a qualified mechanic.

We hope this detailed guide and EVAP System Diagram will help you get the most out of your 2017 Dodge Durango. Remember, safety first, and don't hesitate to consult a professional if you're unsure about any aspect of the repair.

Now that you're armed with this knowledge, you're better equipped to tackle EVAP system issues on your 2017 Dodge Durango. Good luck!

Click HERE to download the full 2017 Dodge Durango EVAP System Diagram.