1999 JEEP Cherokee NEED HELP
12-16-2017 | 09:21 AM
#18
CF Veteran
Joined: Jan 2015
Posts: 1,469
Likes: 26
From: North canaan Connecticut
Year: 01, 99, 98, 98,98
Model: Cherokee
Engine: 4.0
When you said you tested powers and grounds, do you mean at the data port? So you are getting power at the port? And the grounds for it are good? Not trying to ask dumb questions. Just want to make sure we all understand and don't have to assume. Another question as I don't think you stated whether you had check d the related fuses.
12-16-2017 | 10:32 AM
#19
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Newbie
Joined: Dec 2017
Posts: 12
Likes: 0
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0 L6
When you said you tested powers and grounds, do you mean at the data port? So you are getting power at the port? And the grounds for it are good? Not trying to ask dumb questions. Just want to make sure we all understand and don't have to assume. Another question as I don't think you stated whether you had check d the related fuses.
I tested it at the aldl(obd) port and at the ecm connectors and check every single fuse. One fuse was blown but it was unrelated and was replaced. At the aldl I got 59.8 ohms. Between the aldl and the ecm I got .4ohms ccd bus + and .4ohms ccd bus -
12-16-2017 | 10:52 AM
#20
CF Veteran
Joined: May 2015
Posts: 4,481
Likes: 18
From: Arizona
Year: 97
Model: Cherokee
Engine: 4.0
^^ anything's possible. I don't think so... but when I pulled the info on the code he said he got, that's what I saw in the research, and Jeeps are not the only vehicles with that issue.
It was listed as an actual data bus issue. What they call a collision is the same thing you get sending data in an IT realm. Data being sent goes down the wrong path for several reasons and literally hits the traffic coming the other direction on over the same segment of the network.
So means there's something wrong with the actual circuitry. Which is why I suggested possibly trying a known good ecm to either resolve the issue or rule it out.
It was listed as an actual data bus issue. What they call a collision is the same thing you get sending data in an IT realm. Data being sent goes down the wrong path for several reasons and literally hits the traffic coming the other direction on over the same segment of the network.
So means there's something wrong with the actual circuitry. Which is why I suggested possibly trying a known good ecm to either resolve the issue or rule it out.
12-17-2017 | 08:47 AM
#21
Thread Starter
Newbie
Joined: Dec 2017
Posts: 12
Likes: 0
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0 L6
When you said you tested powers and grounds, do you mean at the data port? So you are getting power at the port? And the grounds for it are good? Not trying to ask dumb questions. Just want to make sure we all understand and don't have to assume. Another question as I don't think you stated whether you had check d the related fuses.
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