To be certain, you should:
* Consult your owner's manual: This is the best source for the precise location in your specific van.
* Check online forums: Search for your specific year, make, and model of Dodge van (e.g., "1994 Dodge Ram Van ECM location") on automotive forums. Many owners have posted pictures or detailed instructions.
* Look for a large, rectangular black box: The ECM is usually a relatively large, dark-colored box with numerous connectors.
Be cautious when working near the ECM as it contains sensitive electronics.