NEED HELP Unknown Driver and No Start

[budwich]

you have done a lot of "sectional testing" but it does not prove a complete path.
AS I suggested, at the splice pack, put a jumper in from the the PCM to the DLC pin point. AT the DLC connector, now measure the resistance at the DLC connector for the data pin USING the ground AT THE DLC connector. Report the resistance reading. Do the same test, using the BCM. And finally, do the same test with both PCM AND BCM jumpered to the DLC pin at the splice pack.

IF those report the proper resistance, you then can move on to look at the electrical conditions (voltages / grounds) at the PCM and BCM... reporting the pin that you tested and the value. Once this is done. Then measure the resistance toward the PCM and BCM for those same pins.... **** (edit- I see you have done the resistances for the PCM... not sure I found similar for the BCM).

edit NOTE: TJbaker table is in post 228 and your PCM measurements are in 244 / 248. Your data pin measurements seem high... not good.

 

[budwich]

at the BCM, you need to check the following voltages: accessory, ignition 1 and ignition 0.... at key OFF, Key on/run, and key start. IF these are not correct, then there will be a "power mode" issue.

 

[Mramses]

you have done a lot of "sectional testing" but it does not prove a complete path.
AS I suggested, at the splice pack, put a jumper in from the the PCM to the DLC pin point. AT the DLC connector, now measure the resistance at the DLC connector for the data pin USING the ground AT THE DLC connector. Report the resistance reading. Do the same test, using the BCM. And finally, do the same test with both PCM AND BCM jumpered to the DLC pin at the splice pack.

IF those report the proper resistance, you then can move on to look at the electrical conditions (voltages / grounds) at the PCM and BCM... reporting the pin that you tested and the value. Once this is done. Then measure the resistance toward the PCM and BCM for those same pins.... **** (edit- I see you have done the resistances for the PCM... not sure I found similar for the BCM).

edit NOTE: TJbaker table is in post 228 and your PCM measurements are in 244 / 248. Your data pin measurements seem high... not good.

jumper sp205 pcm and dlc
resistance between pin 2 and pin 4 dlc

 

[Mramses]

you have done a lot of "sectional testing" but it does not prove a complete path.
AS I suggested, at the splice pack, put a jumper in from the the PCM to the DLC pin point. AT the DLC connector, now measure the resistance at the DLC connector for the data pin USING the ground AT THE DLC connector. Report the resistance reading. Do the same test, using the BCM. And finally, do the same test with both PCM AND BCM jumpered to the DLC pin at the splice pack.

IF those report the proper resistance, you then can move on to look at the electrical conditions (voltages / grounds) at the PCM and BCM... reporting the pin that you tested and the value. Once this is done. Then measure the resistance toward the PCM and BCM for those same pins.... **** (edit- I see you have done the resistances for the PCM... not sure I found similar for the BCM).

edit NOTE: TJbaker table is in post 228 and your PCM measurements are in 244 / 248. Your data pin measurements seem high... not good.

jumper sp205 bcm and dlc
resistance between pin 2 and pin 4 dlc

 

[Mramses]

jumper sp205 pcm, bcm and dlc
resistance between pin 2 and pin 4 dlc

 

[Mramses]

at the BCM, you need to check the following voltages: accessory, ignition 1 and ignition 0.... at key OFF, Key on/run, and key start. IF these are not correct, then there will be a "power mode" issue.

Power bcm
C3
A1, A18, A19 Y A20
B4, B13 Y B17
C1
A3

 

[Mramses]

at the BCM, you need to check the following voltages: accessory, ignition 1 and ignition 0.... at key OFF, Key on/run, and key start. IF these are not correct, then there will be a "power mode" issue.

Ground bcm
C3
B11 y A11

 

[TJBaker57]

I will be travelling today but here is a test of some of my BCM readings measured on the kitchen table... For comparison sake..

 

[Mramses]

I will be travelling today but here is a test of some of my BCM readings measured on the kitchen table... For comparison sake..

View attachment 97379

 

[Mramses]

C

I will be travelling today but here is a test of some of my BCM readings measured on the kitchen table... For comparison sake..

View attachment 97379

C3 A7-A11 OPEN

C3 A17-A11 OPEN

 

[TJBaker57]

The C1, A3 is measured to C3, A11?? Yes??

 

[Mramses]

cluster pin resistance. gives me measurement to ground or continuity between A4 and A1
A4 and B10

 

[Mramses]

The C1, A3 is measured to C3, A11?? Yes??

Yes

 

[Mramses]

equal result to C3 B11

 

[Mramses]

resistance measurement sp205 jumper bcm and DLC
pin2 and pin 4
the pcm is not connected

 

[Mramses]

resistance measurement when connecting pcm, bcm and dlc
pin 2 and pin 4 measurement

 

[TJBaker57]

equal result to C3 B11

Yes C3, A11 and C3, B11 are the same internally I believe. They measure zero ohms between them.

 

[Mramses]

resistance measurement when connecting pcm, bcm, cluster and dlc
pin 2 and pin 4 measurement

 

[TJBaker57]

C
C3 A7-A11 OPEN

C3 A17-A11 OPEN

According to the wiring diagrams these terminals have no wires to them from the vehicle so it should not matter if they are open?

 

[TJBaker57]

cluster pin resistance. gives me measurement to ground or continuity between A4 and A1
A4 and B10

Did you happen to measure the continuity of the cluster ground connection to a known good ground to be sure the cluster ground is good?

 

[budwich]

I have been away and am still trying to digest what has been posted / tested. Remember the purpose of the test is to find some consistency at various points.... so measuring a resistance at the splice pack toward a device (data line) should be close to the same / the same as measuring the same resistance at the DLC to the same device when it is the only device jumpered. These are the checks. It will take a bit to digest. Anyway, thanks for the return info. Hopefully something will jump out.

 

[budwich]

Power bcm
C3
A1, A18, A19 Y A20
B4, B13 Y B17
C1
A3

this is good testing but not quite what I suggested / asked for ... sorry.

You need to measure like you have done but only points c3-a18 (ign0), c3-a19 (ign1), c3-a20 (ign3) and c3-b15 (accessory). make a table... each of those points need to be measured when the key is OFF, then with Key ON, and then with Key start. Hopefully, you understand. table with 4 points and 3 voltages against each point based on key position.

 

[budwich]

note that these BCM resistance measurements are somewhat similar / same as those posted by tjbaker. This would likely mean that he and you are testing the same way and the same module. I am not sure that we can say the same thing about the PCM results... I haven't gone backwards that far.

ALSO NOTE: you didn't measure the resistance of c3-b15 (accessory pin).

ALSO NOTE: that the resistances for input power look very similar for all inputs of 12v which one might expect.

I am not sure why my "quoted reply" isn't in the post... I can see it during editing.

 

[budwich]

mramses... in post 244, you provide resistance test for the PCM. Can you do the test again and provide the table for both PCM's that you have so we can compare directly. thanks it will be easier than hunting back thru.

 

[budwich]

cluster pin resistance. gives me measurement to ground or continuity between A4 and A1
A4 and B10

The list of resistances for the IP seem ok. Again, those associated with input power and data comms are of interest and appear to be somewhat probable / reasonable. Based on your tests with it so far, it lights the all bulbs and seems basically operational but possibly not getting any communication from the PCM / BCM. Because you can't seem to communicate with it from the DLC jumpered at the splice pack, that would seem to indicate that the odb interface / app that you are using (based on tjbakers work) may have a problem. Have you been able to get the obd interface and app to work with another vehicle to confirm its operation?

 

[Mramses]

The list of resistances for the IP seem ok. Again, those associated with input power and data comms are of interest and appear to be somewhat probable / reasonable. Based on your tests with it so far, it lights the all bulbs and seems basically operational but possibly not getting any communication from the PCM / BCM. Because you can't seem to communicate with it from the DLC jumpered at the splice pack, that would seem to indicate that the odb interface / app that you are using (based on tjbakers work) may have a problem. Have you been able to get the obd interface and app to work with another vehicle to confirm its operation?

I couldn't do it today

 

[Mramses]

note that these BCM resistance measurements are somewhat similar / same as those posted by tjbaker. This would likely mean that he and you are testing the same way and the same module. I am not sure that we can say the same thing about the PCM results... I haven't gone backwards that far.

ALSO NOTE: you didn't measure the resistance of c3-b15 (accessory pin).

ALSO NOTE: that the resistances for input power look very similar for all inputs of 12v which one might expect.

I am not sure why my "quoted reply" isn't in the post... I can see it during editing.

skip measurement C3 B15-A11
Tomorrow I will do the missing and the measurement table of 2 pcm. I still could not test the elm327 in another vehicle nor could I use the elm327 usb in the absence of a laptop but I have it pending

 

[Mramses]

I have been away and am still trying to digest what has been posted / tested. Remember the purpose of the test is to find some consistency at various points.... so measuring a resistance at the splice pack toward a device (data line) should be close to the same / the same as measuring the same resistance at the DLC to the same device when it is the only device jumpered. These are the checks. It will take a bit to digest. Anyway, thanks for the return info. Hopefully something will jump out.

why can't it even read the PCM with the elm327 bluetooth?

 

[budwich]

why can't it even read the PCM with the elm327 bluetooth?

at this point, we don't know if your elm and app even work properly. Further, when you had access to a tech2 (way back) which did not connect, did you have two pcm's at that point?

 

[budwich]

one more question... early in your posts and tests, you indicated problems with reading resistances at the splice pack with some pins showing a "short to ground"... for example ebcm. Have you rechecked these test readings again now that you see what happens when only the PCM, BCM, and IPC are connected only.

 

[Mramses]

The ebcm has two connectors, when I disconnect the one from the electric brake pump, the light blue communication cable stops being grounded. if I reconnect it is back to ground

one more question... early in your posts and tests, you indicated problems with reading resistances at the splice pack with some pins showing a "short to ground"... for example ebcm. Have you rechecked these test readings again now that you see what happens when only the PCM, BCM, and IPC are connected only.

 

[budwich]

IF you go the ebcm module, unplug both cables and then do a resistance measurement for the same pin at the module measurement to ground, what does it read? It is possible that module may have taken out the data bus and caused problems for some modules in terms of their electrical interface... but that is just an idea. I would expect the design to be strong enough not to have that happen but grounds on "powered lines" is not very good long term.

It still may not explain why when only pcm, bcm and ipc are connected that they can't talk. You still need to verify your elm/app operation.

 

[budwich]

The ebcm has two connectors, when I disconnect the one from the electric brake pump, the light blue communication cable stops being grounded. if I reconnect it is back to ground

You are referring to the 2 wire connector, right? That connector carries ground and battery positive voltage, so when you remove it, there is no grounds (or voltage) actually going to the ebcm as the other connector only has signal / sensor pins. Check the pin alignment on all these connectors.

 

[Mramses]

IF you go the ebcm module, unplug both cables and then do a resistance measurement for the same pin at the module measurement to ground, what does it read? It is possible that module may have taken out the data bus and caused problems for some modules in terms of their electrical interface... but that is just an idea. I would expect the design to be strong enough not to have that happen but grounds on "powered lines" is not very good long term.

It still may not explain why when only pcm, bcm and ipc are connected that they can't talk. You still need to verify your elm/app operation.

when i disconnect both harness from ebcm and measure resistance between power wire on sp205 to ground pin 4 DLC, it registers infinite or open resistance

 

[Mramses]

IF you go the ebcm module, unplug both cables and then do a resistance measurement for the same pin at the module measurement to ground, what does it read? It is possible that module may have taken out the data bus and caused problems for some modules in terms of their electrical interface... but that is just an idea. I would expect the design to be strong enough not to have that happen but grounds on "powered lines" is not very good long term.

It still may not explain why when only pcm, bcm and ipc are connected that they can't talk. You still need to verify your elm/app operation.

I USE ELM327 BLUETOOH BLUE, APP TORQUE AND CAR SCANNER THAT THE FRIEND TJBAKER57 INDICATED ME

 

[Mramses]

You are referring to the 2 wire connector, right? That connector carries ground and battery positive voltage, so when you remove it, there is no grounds (or voltage) actually going to the ebcm as the other connector only has signal / sensor pins. Check the pin alignment on all these connectors.

Yes, to that thick cable connector. It certainly does not have ground except that coming from the connector that feeds the master cylinder.
I verify and inform you friend.

 

[Mramses]

friends, is it possible to use BCM, PCM and IP or cluster of another truck and require reprogramming? what happens in this case? please
My pre-account is going to be able to do tests avoiding a reprogramming of the BCM or IP or PCM

 

[budwich]

As mentioned by others, replacing the BCM requires significant "programming" as all the options for the truck have to "captured/input". The PCM replacement likely requires a relearn of security. I don't believe the IP requires anything special assuming it comes from the same year.

You mentioned that you used the same elm327 and apps that tjbaker uses / suggested BUT that doesn't prove that the elm327 interface actually works with any vehicle. You need to find a friend or otherwise, that you can verify that you can talk to the vehicle via your elm327 and read codes / data.
I know from experience that I have some elm327 that don't work on some vehicles or take a bit to get them to work / connect. As a cheap test, get a cheap simple code reader to help with at least verifying that a reader can plug into the dlc socket and get codes from the PCM. The work that tjbaker did and showed was to help sectionalize talking to various devices on the serial data bus which you weren't able to complete successfully. That either means that your elm327 interface is not working and / or those devices have issue. It is hard to believe that the PCM, BCM, and IP have all failed. The basic electrical tests that you have been doing and are doing is trying to understand that your basically electric sanity of the system is OK... so you need to complete those.
You need to follow the request for the BCM voltages as I suggested as those will tell you what state the BCM may be in (referred to as power mode).

 

[Mramses]

As mentioned by others, replacing the BCM requires significant "programming" as all the options for the truck have to "captured/input". The PCM replacement likely requires a relearn of security. I don't believe the IP requires anything special assuming it comes from the same year.

You mentioned that you used the same elm327 and apps that tjbaker uses / suggested BUT that doesn't prove that the elm327 interface actually works with any vehicle. You need to find a friend or otherwise, that you can verify that you can talk to the vehicle via your elm327 and read codes / data.
I know from experience that I have some elm327 that don't work on some vehicles or take a bit to get them to work / connect. As a cheap test, get a cheap simple code reader to help with at least verifying that a reader can plug into the dlc socket and get codes from the PCM. The work that tjbaker did and showed was to help sectionalize talking to various devices on the serial data bus which you weren't able to complete successfully. That either means that your elm327 interface is not working and / or those devices have issue. It is hard to believe that the PCM, BCM, and IP have all failed. The basic electrical tests that you have been doing and are doing is trying to understand that your basically electric sanity of the system is OK... so you need to complete those.
You need to follow the request for the BCM voltages as I suggested as those will tell you what state the BCM may be in (referred to as power mode).

Understood friend

 

[Mramses]

As mentioned by others, replacing the BCM requires significant "programming" as all the options for the truck have to "captured/input". The PCM replacement likely requires a relearn of security. I don't believe the IP requires anything special assuming it comes from the same year.

You mentioned that you used the same elm327 and apps that tjbaker uses / suggested BUT that doesn't prove that the elm327 interface actually works with any vehicle. You need to find a friend or otherwise, that you can verify that you can talk to the vehicle via your elm327 and read codes / data.
I know from experience that I have some elm327 that don't work on some vehicles or take a bit to get them to work / connect. As a cheap test, get a cheap simple code reader to help with at least verifying that a reader can plug into the dlc socket and get codes from the PCM. The work that tjbaker did and showed was to help sectionalize talking to various devices on the serial data bus which you weren't able to complete successfully. That either means that your elm327 interface is not working and / or those devices have issue. It is hard to believe that the PCM, BCM, and IP have all failed. The basic electrical tests that you have been doing and are doing is trying to understand that your basically electric sanity of the system is OK... so you need to complete those.
You need to follow the request for the BCM voltages as I suggested as those will tell you what state the BCM may be in (referred to as power mode).

I can ask you another question:
Why when I measure voltage between the light green BCM data cable on sp205 and on DLC pin 4, I do not measure any value, neither when it is off, nor when inserting the key, nor in run, nor start?
it's something that confuses me.
When I measure the gray cable of the IP or cluster it measures 1.19 vdc fixed, when I connect the PCM it reads voltage on the dark green cable fluctuating between 0.3 to 3 vdc and after about 10 seconds it drops to 0v. I also measure this value when the PCM is connected and I measure on a light green wire.
I know that measuring with the tester is not the best but something allows us to deduce.
the rest of the modules do not generate voltage at any time.
friend thanks for following my case