How to Locate the Electronic Control Unit Ignition Module Computer Brain Box in a 1990 Dodge D150
- 1). Raise the hood on your D150. Stand on the passenger's side of the engine compartment on the hubcap side of the front tire. You should be looking across the engine.
- 2). Locate the blower motor against the firewall to your immediate left. It resembles a medium sized, black metal can. Just below and to the left of the blower motor you should see a large plastic rectangular shaped box. The box also has a large 60 pin wiring harness connected to it that's held in place with a single bolt. This is your Dodge D150's powertrain control module.
- 3). Disconnect the negative cable from your D150's battery with a socket wrench before you attempt to remove the PCM. Remove the bolt holding the wiring harness onto the PCM with a socket wrench. Remove the two bolts on the left, upper and lower side of the powertrain control module with your socket wrench. Remove the single bolt on the lower, right side of the PCM with your socket wrench as well. Lift the powertrain control module out of the engine compartment using both hands.