How To Solder A Severed Ecu Return To Battery Terminal Cable Repair Guide

Difficulty

Moderate

Steps

Time Required

                          15 - 25 minutes

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How to solder a severed ECU return to battery terminal cable
8 steps

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Back1984-1989 Toyota 4Runner
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Introduction

View this How To Guide on soldering if you need any more tips for this part of the guide.

How To Solder and Desolder Connections

What you need

Step 1

              How to solder a severed ECU return to battery terminal cable

Be sure to turn your car completely off before touching any component of the battery.
Disconnect the ECU and positive cable by using your 12mm wrench to loosen the bolt on the battery’s positive terminal.
Once the cables are disconnected, place the positive cable out of the way.

Be sure to turn your car completely off before touching any component of the battery.

Disconnect the ECU and positive cable by using your 12mm wrench to loosen the bolt on the battery’s positive terminal.

Once the cables are disconnected, place the positive cable out of the way.

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Step 2

Place a piece of cardboard on top of the battery to work on.
Peel the black electrical tape off of the ECU wire.
If that doesn’t work, carefully take a knife and cut the tape off

Place a piece of cardboard on top of the battery to work on.

Peel the black electrical tape off of the ECU wire.

If that doesn’t work, carefully take a knife and cut the tape off

Step 3

Spread the individual wires apart in each cable.
Then mesh the ends of the cables together.
Pinch down on the meshed cable ends.
They should hold themselves together.
If the cables are dirty, use the wire brush to clean off any debris.

Spread the individual wires apart in each cable.

Then mesh the ends of the cables together.

Pinch down on the meshed cable ends.

They should hold themselves together.

If the cables are dirty, use the wire brush to clean off any debris.

Step 4

Plug your soldering iron in to let it warm up.
The one I am using takes about 15 minutes to warm up.
Tape the white cable to the cardboard so that the cables don’t move around while you’re working.

Plug your soldering iron in to let it warm up.

The one I am using takes about 15 minutes to warm up.

Tape the white cable to the cardboard so that the cables don’t move around while you’re working.

Step 5

Gingerly apply solder to the severed cables.
For help with soldering best practices, check out our How to Solder and Desolder Connections guide.
When done the cables should have no issue supporting their own weight, and should be able to withstand a little tug.
If you see smoke, just back off and slow down.

Gingerly apply solder to the severed cables.

For help with soldering best practices, check out our How to Solder and Desolder Connections guide.

When done the cables should have no issue supporting their own weight, and should be able to withstand a little tug.

If you see smoke, just back off and slow down.

Step 6

Take your shrink wrap, and wrap it around the cable.
Use a hair dryer to blast the shrink wrap with heat. Move the dryer up and down over the wrap.
Do this for about a minute or until the wrap has formed around the wire.

Take your shrink wrap, and wrap it around the cable.

Use a hair dryer to blast the shrink wrap with heat. Move the dryer up and down over the wrap.

Do this for about a minute or until the wrap has formed around the wire.

Step 7

Wrap a few layers of electrical tape over the heat shrink tubing.
Work your way up the cable and cut the tape once you’ve reached the top.
Once more tape the cable starting a few inches below the solder and work your way back to the top. Cut the tape again.

Wrap a few layers of electrical tape over the heat shrink tubing.

Work your way up the cable and cut the tape once you’ve reached the top.

Once more tape the cable starting a few inches below the solder and work your way back to the top. Cut the tape again.

Step 8

Place the positive cable down first.
Then place a washer between the cables.
Place the ECU cable, then one final washer, and finally tighten the bolt on top.
Place the positive cable on the battery first. (The one we weren’t fixing)

Place the positive cable down first.

Then place a washer between the cables.

Place the ECU cable, then one final washer, and finally tighten the bolt on top.

Place the positive cable on the battery first. (The one we weren’t fixing)

To reassemble your device, besure to place the positive cable down first. Then place a washer between the cables. Place the last washer on top of the ECU cable, then bolt down.

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                    Kevin Fitzgerald

Member since: 04/29/2020

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