Dodge Caravan and Chrysler Minivan EVAP System and ESIM Explained
A 2006 Dodge Caravan EVAP system diagram can seem confusing, but it explains how your van handles fuel vapors. The evaporative emissions system prevents harmful hydrocarbons from escaping into the air. For owners of Caravan, Grand Caravan, Town & Country, and Pacifica, understanding this diagram—including the evaporative system integrity monitor (ESIM)—helps diagnose check engine lights and common fault codes.
How to Read a Dodge Caravan EVAP System Diagram
The evaporative emissions system stores fuel vapor from the tank and later lets the engine draw it in and burn it, instead of venting it to the air. A diagram shows the fuel tank, filler neck and gas cap, rollover or vent valves, charcoal canister, purge valve, vent or leak-detection hardware, and the vapor lines between them. These components work together to keep vapors contained until the engine can consume them.
To read the diagram, start by identifying the fuel tank and follow the vapor lines to the charcoal canister. Note the purge valve near the engine that connects to the intake manifold, and the vent valve or ESIM on the canister's fresh air side. Symbols and line labels can vary by model year and emissions package, so use factory service information for your exact VIN rather than a generic picture.
EVAP Layouts on 2001–2007 Caravan, Grand Caravan and Town & Country
On 2001–2007 Caravan, Grand Caravan, and Town & Country vans, the general layout places the fuel tank and charcoal canister near the rear underbody, while purge hardware sits in the engine bay. However, exact positions vary, and short-wheelbase models may differ from extended versions. Some vehicles in this period used a leak detection pump instead of a later ESIM-style design, so confirm which system your van has before referencing diagrams.
Perform safe visual checks with the engine off and cool. Inspect the gas cap seal for cracks or deformation, look for cracked or loose hoses, and check for damage near the canister from road debris. Do not disconnect pressurized fuel or vapor lines, and always keep ignition sources away from fuel vapors.
EVAP Diagrams for the 2007 and 2017 Chrysler Pacifica
The 2007 Pacifica and the 2017 Pacifica are entirely different vehicle designs, so their EVAP layouts should not be treated as interchangeable. Diagrams for either model will show the tank, canister, purge control, and vent or integrity monitoring hardware, but their packaging differs significantly. The later Pacifica lineup includes various powertrains, and fuel and vapor system details depend on the exact configuration and VIN.
Before tracing lines or naming parts, obtain the service diagram for your specific year and trim. Relying on a generic image can lead to misidentification, especially with the different emissions packages available. Use factory service information to ensure accurate reference.
EVAP System Diagrams for 2010 and 2014 Dodge Caravan Models
Later Caravan and Grand Caravan models, including 2010 and 2014, typically show a vent-side integrity monitoring device instead of the older pump-style leak detection hardware, but this should be confirmed for the specific van. On the diagram, follow the vent path from the canister to fresh air, often through the ESIM, and the purge path from the canister to the engine intake through the purge valve.
The diagram may also show electrical connectors and wiring linking the purge valve and monitor to the engine control module. Wiring colors, connector pin numbers, and part numbers should come from VIN-specific service information, not from a general article, to avoid mistakes during diagnosis or repair.
What the Evaporative System Integrity Monitor (ESIM) Does
The evaporative system integrity monitor (ESIM) helps the engine computer check whether the sealed EVAP system is holding pressure or vacuum as expected. It uses natural vacuum or pressure changes that occur as the fuel tank cools after driving. The monitor typically runs after the vehicle sits with the engine off, when temperature changes create measurable pressure variations.
The ESIM is generally located on the vent side of the system near the charcoal canister, toward the rear of the van, but confirm the exact location in service information for your model year. Conditions such as fuel level, outside temperature, and recent refueling can affect whether the monitor runs, and a single drive may not complete it.
ESIM Concerns on 2010–2014 Dodge Grand Caravan
On 2010–2014 Dodge Grand Caravan models, owners might notice a check-engine light, an EVAP monitor that is not ready at inspection, or a fuel smell. These symptoms can indicate an EVAP problem, but they do not specify the cause. An EVAP code does not by itself prove the ESIM has failed, because leaking hoses, a bad gas cap seal, purge valve problems, or wiring faults can set similar codes.
Safe owner checks include examining the gas cap condition and fit, tightening it properly, and seeing if the check-engine light returns after a few drive cycles. Also inspect the canister area for visible damage. If the light persists, professional testing is needed. Smoke testing, scan-tool monitor tests, and electrical checks give a more reliable answer than replacing parts on a guess.
Common EVAP Trouble Codes and When to Get Professional Testing
Generic OBD-II EVAP codes in the P0440–P0457 range have standardized general descriptions, such as large leak, small leak, or purge flow problems. However, the exact wording and freeze-frame data should be read with a scan tool. Manufacturer-specific codes, and any code whose meaning depends on the manufacturer, must be checked against Chrysler/Dodge service information for the exact vehicle before interpreting them. Do not assume a universal definition.
A code points to a test result or circuit, not a confirmed failed part. See a professional promptly if you smell raw fuel, see a fuel leak, or notice drivability problems. EVAP diagnosis near fuel vapor should not be done with improvised pressure or open flames. Record the codes, the conditions when the light came on, and any recent refueling or repairs to share with the technician.