2001 4.0 PCM trouble shooting

2

2001BlackonBlack

NAXJA Forum User

Location

Denver Tech Center

• Apr 14, 2011

• #1

So many of you may have already seen my post a few weeks ago titled 4.0 voltage issue. Here is the update followed by a question with in my charging system I have now replaced the battery, all four leads coming off of it, the alternator, and check every other splice, and connecters, and they are all good the source and field voltage is where my problem is. The generator source voltage is 12.16 VDC, and the generator field is Zero. I'm trying to figure out if the generator field outputs from the PCM or comes off of the generator. So my question is this,

How can I verify that my PCM is faulty without spending the ridiculous about of money to buy another one?

 

O

orange

NAXJA Forum User

Location

Texas

• Apr 14, 2011

• #2

There is a temperature sensor in the bottom of the battery tray, center, it goes to PCM. If it is short/open can zonk system.

 

2

2001BlackonBlack

NAXJA Forum User

Location

Denver Tech Center

• Apr 14, 2011

• #3

Also I forgot to say that I am not pulling any codes

 

2

2001BlackonBlack

NAXJA Forum User

Location

Denver Tech Center

• Apr 14, 2011

• #4

Orange, do you know what pin and connector the battery sensor goes to on the PCM?

 

O

orange

NAXJA Forum User

Location

Texas

• Apr 14, 2011

• #5

No info on 2001.

Most likely place for problem is right near Battery, so quick looksee might find it.

Good Luck,
Orange

 

2

2001BlackonBlack

NAXJA Forum User

Location

Denver Tech Center

• Apr 14, 2011

• #6

I've done the deep looksee, So acording to ALLDATA I should have 5 VDC sent by the PCM I'll check for that to verifty the cable is good, and just buy a new BTS propably pretty cheap.

 

2

2001BlackonBlack

NAXJA Forum User

Location

Denver Tech Center

• Apr 15, 2011

• #7

Any tips to check the batt temp sensor without paying the 25 bucks for a new one?

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Apr 16, 2011

• #8

If you get stuck and have to replace some components, a good source is a salvage yard. Especially for something like the computer, which is expensive, even for an online refurb. Just be sure that it is a computer that is applicable for the year/ transmission.