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Mystery: Mitsubishi Charisma 2002 - Link Between Transmission and Battery


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amosquitoz
New User

Mar 12, 2020, 11:31 AM

Post #1 of 4 (402 views)
Mystery: Mitsubishi Charisma 2002 - Link Between Transmission and Battery Sign In

Hey everyone,

I’m hoping you can help me solve a mystery.
This is a 2002 Charisma.
The gear shifts are far from smooth. I feel it when accelerating. And when I come to a full stop, 2 seconds later, the car “jumps” as the transmission shifts (late) back into 1st gear. This problem comes and goes.
There is a direct link between this issue and the car’s battery. For example, the issue was bad, and then I forgot the lights on when I parked. After I used another car’s battery to start the engine with cables, the problem went away. A week later, I forgot the lights again, the battery got emptied, and this time the issue came back after I started the car again.
My regular mechanic insists there can’t be a connection between the transmission problem and the battery, so he doesn’t know how to help.

HOWEVER.

I once went (two years ago) to this weird dude in another town, a mechanic who fixed the issue in a matter of about two minutes, including getting the yellow engine bulb to turn off. I couldn’t see what he was doing, but he was definitely doing something with the battery. He wouldn’t tell me what, he was super confidential about it, plus, he hasn’t returned my calls since.

Weird story, but I swear by it!
Anyone have any idea what the dude might have done? I’m not good with cars at all, but I’m sure it’s something simple I can do myself, if I only knew what it was.

Thank you!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 12, 2020, 11:42 AM

Post #2 of 4 (399 views)
Re: Mystery: Mitsubishi Charisma 2002 - Link Between Transmission and Battery Sign In

I can say yes and no that they are connected.

What is actually happening is a trouble code is setting in the transmission control Module which causes the trans to act differently. When your battery went dead it caused the Trans module to lose it's memory and clear the codes. Now it will drive normal until the malfunction occurs again and the code resets.

You problem is actually in the trans only.

We have a trans specialist named Gary that will be along to give you a better idea of what the trans issue is.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



gsferraro
Enthusiast

Mar 12, 2020, 2:47 PM

Post #3 of 4 (379 views)
Re: Mystery: Mitsubishi Charisma 2002 - Link Between Transmission and Battery Sign In

Hello,
If you do not have enough voltage going to the trans it will not operate correctly but a lot more would be happening not just banging on the downshift. Does this happen when the car is hot and cold? can you tell me if any codes are present for the trans? I'm not sure what transmission is in your car, we do not have that model here in the States, do you happen to know the name of the trans? Gary


White Trash CVP
User

Nov 10, 2020, 6:16 AM

Post #4 of 4 (63 views)
Re: Mystery: Mitsubishi Charisma 2002 - Link Between Transmission and Battery Sign In

Not to say one way or t'other .. but a few years back I had a Hino FB come in for a second opinion, the diagnosis was "Needs a transmission".

In fact it just needed an alternator.

Doing due diligence on the main electrics .. battery, clean and tight terminals, charging voltage, etc .. Well - it's not going to break anything, right?

Do you have access to a DVM? Battery measured across the terminals should be ~11-12V sitting key off, 13.5-14.2 with the engine running.






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