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Where is the ECU on a 1991 Honda Civic DX and how do you replace it?

The ECU (Engine Control Unit) on a 1991 Honda Civic DX is located behind the center console. Here's a step-by-step guide on how to replace it:

Tools and Materials Needed:

- Phillips-head screwdriver

- Flat-head screwdriver

- Socket wrench set

- 10 mm socket

- New ECU (matching your vehicle's specifications)

Procedure:

Step 1: Disconnect the Battery:

--Disconnect the negative terminal of the battery to avoid any electrical hazards.

Step 2: Remove Center Console:

--Use a Phillips-head screwdriver to remove the screws securing the center console to the dashboard.

--Lift the center console and disconnect any electrical connections attached to it.

--This will expose the ECU.

Step 3: Disconnect ECU Connectors:

--Locate the ECU. It's usually a rectangular box held in place by screws or bolts.

--Disconnect all the electrical connectors attached to the ECU by gently pressing on the release tabs and pulling them out.

Step 4: Remove Mounting Bolts:

--Use a 10 mm socket to remove the bolts or nuts holding the ECU in place.

Step 5: Remove Old ECU:

--Once the bolts are removed, carefully pull out the old ECU from its housing.

Step 6: Install New ECU:

--Align the new ECU with its mounting bracket and insert the bolts or nuts that you removed in Step 4.

--Tighten the bolts or nuts securely.

Step 7: Reconnect ECU Connectors:

--Reconnect all the electrical connectors that you disconnected in Step 3.

--Make sure the connections are secure.

Step 8: Reinstall Center Console:

--Reposition the center console and secure it back in place using the screws you removed earlier.

Step 9: Reconnect Battery:

--Reconnect the negative terminal of the battery.

Step 10: Test the ECU:

--Start the vehicle and check if the engine is running smoothly.

--If the engine starts and runs without any issues, the ECU has been successfully replaced.

Note:

If you're not confident in performing this task or encounter any difficulties, it's recommended to seek assistance from a qualified mechanic or an automotive professional.