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battery light - no charge - alt good

 
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Old 20 Jul 2010, 10:18 am
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Default battery light - no charge - alt good

I have a 2001 PT limited with auto trans.

Sunday while driving a few hours from home, the battery light came on. Not knowing at the time how much of a PAIN it was to replace the alternator, I stopped at 2 different auto parts stores to pick up an alternator. No one had one in stock.

So I bought a battery so I would have a good charged one for us to continue home when the one in the car went too dead to keep us going.

We did have to change the battery, and the transmission did stop upshifting into high. But we took our time and made it home.

Now the alternator checks out OK, but the battery light is still on, even with a new alternator.

The codes I get are 0622 - Open or short circuit in alternator field control circuit. And 0700 - Transaxle control system malfunction.

Anyone have any ideas what and where to look for the problem?

Thanks! It's driving me nuts! I never owned a car before that you had to take the axle out in order to change the alternator!
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Old 20 Jul 2010, 10:38 am
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Default Re: battery light - no charge - alt good

Welcome to the forum.

From PT Do-It-Yourself.net:

P0700 is an informational DTC (Diagnostic Trouble Code) letting you know that a DTC(s) is stored in the Transmission Control Module.

A DTC is the result of a system or circuit failure, but does not directly identify the failed component or components. It could be any of the conditions. I would not assume that it is the solenoid pack without further tests with a DRB scan tool and diagnostic manual.

Second: I looked through the Haynes and Chilton manuals and neither say anything about taking the axle out to replace the alternator. There are quite a bit of steps to take it out but both manuals give you plenty of instructions and pictures.
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Old 20 Jul 2010, 10:46 am
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Default Re: battery light - no charge - alt good

Step 9 in Section 5-10 of my Chilton manual says remove the drive axle (see chapter 8).

There is NO WAY to get this thing out with the axle in the car!

I also had to remove the oil filter and move the power steering cooler.


So I guess I need to use a scan tool to see where to go from here.
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Old 20 Jul 2010, 10:52 am
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Default Re: battery light - no charge - alt good

Try AdvanceAuto,etc, and guy some pre-made battery cables and add some grounds - I added one to engine block and one to engine computer housing.
I've read posts of folks losing ground connections - and that's my hunch with yours.
THe P0700 is a generic Trans code..
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Old 20 Jul 2010, 10:53 am
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Default Re: battery light - no charge - alt good

Ooops. Sorry, read through it too fast and missed that one line. As I said, there are quite a bit of steps and pictures. Gotta read slower next time.
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Old 20 Jul 2010, 02:59 pm
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Default Re: battery light - no charge - alt good

A lot of people mistake this light for a "battery light" or "alternator light". It's neither; it's a charging light.

When the light comes on, it doesn't automatically mean there's a problem with the battery or alternator themselves, but just a general problem in the charging system.

In your case, you most likely have a bad positive or negative battery cable.
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Old 20 Jul 2010, 04:35 pm
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Default Re: battery light - no charge - alt good

If it's a bad cable, I would think the car wouldn't start with a charged battery.

If I charge the battery, it cranks and starts just fine.

I don't doubt that the problem could be a connection or ground some where, but do you really think it may be one of the 2 main cables if the car starts?
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Old 21 Jul 2010, 08:25 pm
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Default Re: battery light - no charge - alt good

Yes. There could be enough corrosion to not allow the alternator to properly charge the battery while driving.
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Old 24 Jul 2010, 01:13 pm
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Default Re: battery light - no charge - alt good

Still no luck. I've been going over wiring connections and cleaning things up, but everything checks out OK.

The only thing I have found strange is that one of the connectors to the computer has a lot of oil in it. Maybe this is creating some sort of short.

And can I get a computer from the junk yard to replace this one with out any problems?
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Old 24 Jul 2010, 05:22 pm
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Default Re: battery light - no charge - alt good

Well I found the problem with the battery light. After taking the alternator out which included removing the drive axle, the oil filter and the power steering cooler (whoever the heck approved this design should be strung up by their testicles!).

Well I've been going over grounds and wire connections for the last 6 hours only to find nothing and give up.

At that point I put the suspension all back together and buttoned it up.

After that was done, I started again tracing wires. And thats when I found a small hole rubbed through the braid on the wire harness going to the alternator.

That small hole was rubbed in the braid by the CV joint boot! And that rubbed a break in the green wire inside the wire loom.

So I have now cut back the loom and soldered in a splice. No more battery light.

But I am now getting a P1684 code - which isn't in my book. Anyone have any Ideas?
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