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How to Wire a Chevy ECM

Electronic Control Monitors are often used in older Chevrolet vehicles. Once On-Board Diagnostics became standardized in 1996, the ECM units name largely changed to Powertrain Control Module (PCM). Either way, both are your Chevys computer. The ECM routinely performs system checks and monitors sensors throughout the vehicle. While both the part itself and its function sounds complex, the wiring is not. For ease in explanation, the following steps while also mirror how to replace the ECM.

Instructions

1

Prop open the hood over your Chevrolets engine. Disconnect the negative battery cable from the negative terminal. Wait at least five minutes until residual power within the vehicle has drained off.

2

Open your passenger side door, and then open the glove box.

3

Remove the glove box. How to do this depends on the model and year of your Chevrolet vehicle. Most often, the process involves releasing retaining clips, as well as stops on both sides of the glove box. Also depending on the model, you can either let the box hang down on its hinges, or you will have to remove the hinges to get the box completely out of the dashboard. For most Chevys with an ECM, the computer is located behind the glove box, and the box needs to be partially or fully removed for reasons of access.

4

Disconnect the wirings harness connectors from the ECM. You do not need tools for this task. The connectors look similar to an Ethernet cable, but only larger.

5

Remove the bolts holding the ECM to the ECMs retaining fixture.

6

Remove the old ECM and place its replacement onto the retaining fixture. Refasten the old retaining bolts.

7

Wire the new ECM to your Chevy. Take both wiring harness connectors and insert them into their appropriate ports on the new ECM. The larger harness connector will attach to the ECM in the larger left slot. The smaller Harness connector will attach to the smaller slot on the right.