I like to clarified my mistake, the pin 27 and 29 I mentioned before are the pins # 28 and 30 in the connector C#3 these are the cables carring the CCD from the PCM to the DCM (Data Connector Module), and the Instruments Cluster, with the cluster in place the cables in the connections show 2.49 and 2.51, removing the instruments cluster make the voltage in the CCD circuit disappear.
Is any one have the electrical diagram for the computer PCM connectors?, my computer Serial number is ending in 322AD.

 

The PCM from the 2001 truck uses the CCD Buss on C3-pins 28 and 30.
The PCM from the 2002 truck uses the PCI Buss on C3-pin 30 only.
Pin 28 is vacant.


Pins 27 and 29 are used for the SCI Buss on both.

 

Well that is my question, how do you know my computer is the new one or steal the old system, are you having the pin's function of every one? in the case Data was talking is right, 28 and 30 are CCD and communicate with cluster and PCM running through DLC and 302 Block. I test this and is ok.

 

yours is 2002 and uses the pci buss. There should not be a wire in connector 3-28.


his is 2001 and uses the ccd buss.

 

So, where is the crack in the engine block?

 

Hey, would any of this help or apply here?

When I got these, two of the charts were not working on their website. Got a 404 site error. But I guess this is better than nothing.

 

Well, back again after couple days with out reporting, sorry about that.
I was reading some information about the 5V in the PCM and how they work, in this case testing the connector C#1 on the PCM I have 12.10 on pin # 2 and with the key switch on and 12.10 on pin #22, on pin #17 I have 5 V and in the pin #4 sensor ground for the 5 V system.
I'm reading in other web: in connector C#1, Pin #17 and ground tested with the digital multi-meter have to show 5.19 V more or less depending of battery status, in between the pin #17 and pin #4 and with the digital multi-meter in the scale of 2K Ohm's have to show 400 Ohm's the lower and 600 Ohm's the higher.
For the connector C #2 which have 5 V. to, is the pin #31, tested equal than connector C #1, pin #31 and ground = 5.19 V, pin #31 and pin #4 in C #1 and the scale in 2K Ohm's the reading is 500 Ohm's or higher.
In my case the reading of the C #2 between pin #31 and C #1 pin #4 is real high 56K Om's, is any one know is this detail is good or bad?

 

I found on the other side some wires exposed on the transmission, specifically in the circular connector with 8 cables, near the insulating rubber connector three wires show the conductive material. the plastic insulation is missing. Other part to change soon. in the mid time new insulation is apply to the wires.

 

Thanks Stev, these diagrams help

 

Other tough day working in the van with no much progress, thank's to all for the help and encouragement provided.

Back to the ship, again after testing the cable's in look for the lost "bus", with the connector from the PCM C #1 unplugged, I test the continuity between pin #4, Sensor Ground and pin #17, 5 Volts. with the Digital meter set at 2 K measurement range, is reading 517 Ohm., meaning the circuit is in operational status.
On the connector C #2 unplugged, after that came out the test of continuity between the pin #31 and the pin #4 in the C #1 with the same setting's used on C #1 and the reading is 59.000 KOhms.
This look to me like some ground is missing in this circuit, then should be around 600 Ohms. the reading on C #2 in this specific test will be close to the result of C #1 test. If the circuit not return signal to the PCM that is the Missing "Bus" ??