'01 What is this relay?
Captain
Joined: Apr 2016
Posts: 647
Likes: 3
From: Alabama
Sorry, my first message was out of time and is just on top of this one.
Let see, I m following you guys for a little because I do have the same problem in my 2002 Dodge Ram Van 2.5 liters 318 engine, all are questions and no many answers, maybe one more in the conversation clear a little the concept.
Do we know how the communication is established between the PCM and the cluster? evidently have to be by cables. are these the #27 and #29 in connector C3 on the PCM.
Let see, I m following you guys for a little because I do have the same problem in my 2002 Dodge Ram Van 2.5 liters 318 engine, all are questions and no many answers, maybe one more in the conversation clear a little the concept.
Do we know how the communication is established between the PCM and the cluster? evidently have to be by cables. are these the #27 and #29 in connector C3 on the PCM.
Last edited by Friar Tuck; Jul 7, 2016 at 12:30 AM.
Thread Starter
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Captain
Joined: Feb 2012
Posts: 515
Likes: 5
From: N. KY
Friar...
thats the problem when a thread gets hi-jacked...
No offense meant to you...
I have to read and re-read this FSM for any of it to sink in... so any discussion is helpful that makes me think about what is going on. Before you chimed in I was unaware of the SCI bus and it's reason for being there... now i know.
thats the problem when a thread gets hi-jacked...
No offense meant to you...
I have to read and re-read this FSM for any of it to sink in... so any discussion is helpful that makes me think about what is going on. Before you chimed in I was unaware of the SCI bus and it's reason for being there... now i know.
Captain
Joined: Apr 2016
Posts: 647
Likes: 3
From: Alabama
The instrument cluster is not required, the vehicle should start/drive/stop without issue with the panel completely unplugged. Any voltage regulator found on the instrument cluster exists only to power a microcontroller chip, gauges, and ODBC connector. Go back to troubleshooting PCM and BCM connections. Start by verifying all ground wires. There are at least six wiring harness connections to ground that will prevent the vehicle from running if they arent making solid connection to battery negative.
Last edited by Friar Tuck; Jul 7, 2016 at 12:38 AM. Reason: Delete reference to CCD BUSS
Thread Starter
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Captain
Joined: Feb 2012
Posts: 515
Likes: 5
From: N. KY
Friar...
I believe the 5V power regulator from the cluster goes to C1 pin5 labeled Transmission Range Sensor Supply... again reminding everyone this is '01 van FSM pinout not '02. see connector pinout image and 8W-40-04 which shows wiring from pin5 to Trans Range Sensor
The 06.jpg seems to show that CCD bus power comes from BCD (body control module, or Central Timer as it is sometimes called) mounted near dog house under radio, but this is the only diagram that shows this relationship of the BCD and power to the CCD bus. I cannot verify this any other way.
In GEN 2, the CCD BUSS gets its 5 volt reference from the cluster, and the SCI BUSS is powered by the PCM.
The 06.jpg seems to show that CCD bus power comes from BCD (body control module, or Central Timer as it is sometimes called) mounted near dog house under radio, but this is the only diagram that shows this relationship of the BCD and power to the CCD bus. I cannot verify this any other way.
Captain
Joined: Apr 2016
Posts: 647
Likes: 3
From: Alabama
I found this information today... for a 1999 Dodge Durango
read the whole exchange here...
http://www.justanswer.com/dodge/12ok...n-problem.html
QUESTION
From what I read here the SCI bus communicates with the Dodge DRB3 scan tool, BUT which bus does the PCM communicate on, the SCI or the CCD bus for engine control?
read the whole exchange here...
http://www.justanswer.com/dodge/12ok...n-problem.html
QUESTION
From what I read here the SCI bus communicates with the Dodge DRB3 scan tool, BUT which bus does the PCM communicate on, the SCI or the CCD bus for engine control?
BTW, you brought up the Durango with your post about the link to JustAnswers.
Captain
Joined: Apr 2016
Posts: 647
Likes: 3
From: Alabama
Friar...
I believe the 5V power regulator from the cluster goes to C1 pin5 labeled Transmission Range Sensor Supply... again reminding everyone this is '01 van FSM pinout not '02. see connector pinout image and 8W-40-04 which shows wiring from pin5 to Trans Range Sensor
The 06.jpg seems to show that CCD bus power comes from BCD (body control module, or Central Timer as it is sometimes called) mounted near dog house under radio, but this is the only diagram that shows this relationship of the BCD and power to the CCD bus. I cannot verify this any other way.
I believe the 5V power regulator from the cluster goes to C1 pin5 labeled Transmission Range Sensor Supply... again reminding everyone this is '01 van FSM pinout not '02. see connector pinout image and 8W-40-04 which shows wiring from pin5 to Trans Range Sensor
The 06.jpg seems to show that CCD bus power comes from BCD (body control module, or Central Timer as it is sometimes called) mounted near dog house under radio, but this is the only diagram that shows this relationship of the BCD and power to the CCD bus. I cannot verify this any other way.
Registered User
Joined: Nov 2013
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tested in the 2002 Van
The 5 volts reference and the bias and termination resistors are all internal to the CCD circuitry in the cluster. There is no external 5 volts from anywhere that is connected to the CCD Buss. It is a part of the circuit inside the cluster. Prove or disprove it by unplugging the cluster and see if you have ~2.5 volts on either pin 3 or 11 of the buss at the DLC connector.
