It's usually mounted to the firewall, near the steering column. It's often covered by a protective shroud.
To find the ECM, follow these steps:
1. Remove the driver's side kick panel: This is the plastic panel that covers the area under the dash, below the steering wheel.
2. Look for a black box: The ECM is usually a rectangular, black box with several connectors. It may be labeled "ECM" or "PCM" (Powertrain Control Module).
3. Check the wiring harness: The ECM will have a large wiring harness connected to it.
Important Note:
* The specific location of the ECM may vary slightly depending on the engine and options installed in the vehicle.
* If you're not comfortable working with electrical components, it's best to consult a qualified mechanic.
If you still can't find the ECM, you can refer to the owner's manual or a repair manual specific to your 1990 Astro van. You can also try searching online for a wiring diagram or locating a diagram at a local auto parts store.
