Skip the auto shop - Our mechanics make house calls

Q: Wiring nightmare

asked by on

I have a 2003 altima that recently received a 6mt trans after being automatic from the beginning of its life as well a a 2006 M/T computer. The competed is wired into the 2003 A/T harness and pins were moved into what I believe are the correct locations. Most of the pins were a direct move to a new location but some powers and grounds were spliced into existing ones since they no longer have dedicated pins in the ecm.

A: This is an extremely difficult task, and in...

This is an extremely difficult task, and involves taking wiring diagrams from the '03 vehicle, and the '06 drivetrain. Then mapping electrical power paths - power in "Start" position only, power in "Run/Start" etc. Then mapping sensors for the computer as you mention.

When I am involved with a swap like this, I put plywood on the walls, attach pegs to hang things from (both the vehicle and the drivetrain), grab some masking tape, and pens for attaching notes to wires, and start sorting it out on the board. When I'm convinced I have it right, then connect the bits in the car, and VERY carefully start applying power and checking for expected results. ECMs and TCMs are expensive.

If you need help with this, consider YourMechanic, as one of our mobile technicians come sort out your electrical issue. Good luck!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How many Intelligent Keys should be included?

You should have two Intelligent Keys with your car. Each Intelligent Key should also contain a mechanical key (a simple cutout key that’s housed inside the body of the Intelligent Key) and a key number plate with important information. However,...

Q: What does the lift gate open Warning Light mean?

The lift gate open Warning Light is located on the instrument panel. This light illuminates when the trunk is not properly closed. When you close the trunk, the light will turn off.

Q: Electric problems

Hello - this sounds like a real mess! Check fuses first of course, to eliminate the simple problems. Then, it's time to break out the electrical diagnostic equipment and dive into the wiring. There are likely multiple wiring and/or connector...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...