NEED HELP Unknown Driver and No Start

[TJBaker57]

As for the grounding of the EBCM class 2 serial data wire, as Mooseman says, that is a primary issue. If grounded then no communications will be possible.... That light blue wire travels through the engine compartment and could possibly be checked there also. There is a large connector directly next to fuseblock and the light blue wire goes through that. It could be another point where you could test by disconnecting and testing each side to see where the grounding is??

 

[Mramses]

question:
I am given these resistance values on the sp205 class2 data linr cables.
107 ohm white hvac wire
102 ohm gray hvac aux cable
Cable 165 ohm blue white connection sp205-sp306
3 ohm light blue ebcm wire (this gives continuity to ground)
the rest of the sp205 wires give infinite resistance
is this normal?
the only ground wire is the ebcm but it strikes me why, the mentioned ones have resistance

 

[Mramses]

As for the grounding of the EBCM class 2 serial data wire, as Mooseman says, that is a primary issue. If grounded then no communications will be possible.... That light blue wire travels through the engine compartment and could possibly be checked there also. There is a large connector directly next to fuseblock and the light blue wire goes through that. It could be another point where you could test by disconnecting and testing each side to see where the grounding is??

View attachment 96875

hello active friend from early. if it's that light blue ebcm cable that gives ground. but I also measured the resistances of each wire and found values that are not all the same and not all give infinite resistance. white 107 ohm, gray 102 ohm, light blue 3 ohm (this gives ground) and blue white 165 ohm. all measured to ground

 

[TJBaker57]

hello active friend from early. if it's that light blue ebcm cable that gives ground. but I also measured the resistances of each wire and found values that are not all the same and not all give infinite resistance. white 107 ohm, gray 102 ohm, light blue 3 ohm (this gives ground) and blue white 165 ohm. all measured to ground

I do not presently know what the resistance values should be. I can quite easily check my own truck for comparison. The EBCM value at 3 ohms does not sound correct.

 

[Mramses]

I do not presently know what the resistance values should be. I can quite easily check my own truck for comparison. The EBCM value at 3 ohms does not sound correct.

okay. these values are those obtained in the sp306 measured to ground
197 ohm brown wire
999 ohm tan or light brown wire
the rest of the cables gave infinite resistance

 

[TJBaker57]

question:
I am given these resistance values on the sp205 class2 data linr cables.
107 ohm white hvac wire
102 ohm gray hvac aux cable
Cable 165 ohm blue white connection sp205-sp306
3 ohm light blue ebcm wire (this gives continuity to ground)
the rest of the sp205 wires give infinite resistance
is this normal?
the only ground wire is the ebcm but it strikes me why, the mentioned ones have resistance

I see in your picture you have your test leads reversed at the meter end. Normal connections are Black = COM. Reverse those connectors and test again. I just tested mine and found some wires read different results with reversed leads.

 

[Mramses]

I do not presently know what the resistance values should be. I can quite easily check my own truck for comparison. The EBCM value at 3 ohms does not sound correct.

 

[Mramses]

I see in your picture you have your test leads reversed at the meter end. Normal connections are Black = COM. Reverse those connectors and test again. I just tested mine and found some wires read different results with reversed leads.

Ok ya corrijo amigo

 

[Mramses]

Ok ya corrijo amigo

I correct my friend. does not connect to elm327 everything remains the same

 

[TJBaker57]

For anyone else following,,, I was comparing my readings and discovered a module when read in one direction was infinite resistance but when read the opposite direction showed dead short, zero ohms to ground.

 

[TJBaker57]

I correct my friend. does not connect to elm327 everything remains the same

Is the resistance to ground for the EBCM the same with test leads reversed?

 

[Mramses]

that could be happening? will the bcm be damaged?
Before doing the test, check each data class 2 wiring from the pcm to sp205, the data class 2 connection between bcm and pcm, the connection from bcm to sp205, the power and grounds of bcm and pcm. everything was ok but there is no difference I am still the same and without being able to connect to the elm327

 

[Mramses]

Is the resistance to ground for the EBCM the same with test leads reversed?

I did the measurement with the red wire in V and the black one in COM to ground and they give me very similar results 110 ohm
I am trying to measure the output voltages of each wire of the sp205 but they do not give me logical values

 

[TJBaker57]

Have you done the test Mooseman recommended? Remove the comb from the splice pack, jumper only the PCM, BCM, and DLC?

 

[TJBaker57]

What app are you using with the ELM327?

 

[Mramses]

Torque_pro v1.8.16 apk

 

[Mramses]

What app are you using with the ELM327?

which one do you use friend

 

[TJBaker57]

which one do you use friend

I ask because there are maybe settings in Torque that should be verified. What does Torque say at the "Adapter Status" option?

 

[TJBaker57]

Have you done this jumper and tried to read with ELM327 or tried to start the truck??

 

[Mramses]

I ask because there are maybe settings in Torque that should be verified. What does Torque say at the "Adapter Status" option?

View attachment 96877

Could you please send the link or installer for that version of torque friend?
yes. I made the connection as you have it in your photo but it does not connect.
also use the car scanner but connect to the elm327 but not to the ecu.
Have you measured voltage between the Could you please send the link or installer for that version of torque friend?
yes. I made the connection as you have it in your photo but it does not connect.
also use the car scanner but connect to the elm327 but not to the ecu.
Have you measured voltage between the light green wire of the sp205 bcm and ground ???
What can be happening because I do not notice changes with these tests? changes with these tests?

 

[Mramses]

if it is the same application but it does not connect to the ecu friend

 

[Mramses]

I ask because there are maybe settings in Torque that should be verified. What does Torque say at the "Adapter Status" option?

View attachment 96877

if it brings the option of "adapter status"

 

[TJBaker57]

Have you measured voltage between the light green wire of the sp205 bcm and ground ???

When there is network signals being sent the voltage seen by a test meter will be low and will change rapidly. My meter in this video is set at 2000 mV (2.0 Volts DC). This video demonstrates the changinng voltages...

 

[TJBaker57]

Your results with Torque Pro and Car Scanner confirm the apps are connecting to the ELM327 device but fail to connect to the PCM.

When the ELM327 tries to connect to a PCM or ECM it broadcasts a request over the network addressed to any PCM or ECM on the network. If there is no answer then the connection to ECU fails. There is no request to any other module(s) so even if the BCM and EBCM, Instrument Cluster and all the other modules are working the scanner app fails because it is only seeking the PCM/ECM.

It is possible your PCM is not answering due to a PCM power connection (there are more than one and 2 of them are required before the PCM will communicate). Or it could be a fault in the serial data line to the PCM or the yellow serial data wire between the PCM and the BCM.

There is a way to use Car Scanner as a terminal and check for network traffic to and from other modules,,, but it is not automatic. The App does not do the job, the user must type in certain specific commands to attempt communication with another module.

 

[Mramses]

When there is network signals being sent the voltage seen by a test meter will be low and will change rapidly. My meter in this video is set at 2000 mV (2.0 Volts DC). This video demonstrates the changinng voltages...

friend but my values do not exceed 1 or 2 vol in dc. I am going to make a video of my measurements in line class2 of pcm and bcm
friend the land G106 where is it located and where does it come from? I checked all the grounds and I don't have the G106 which should go near the base of the shock. and the ground G110 I have it located in the upper adjustment screw of the alternator

 

[Mramses]

Your results with Torque Pro and Car Scanner confirm the apps are connecting to the ELM327 device but fail to connect to the PCM.

When the ELM327 tries to connect to a PCM or ECM it broadcasts a request over the network addressed to any PCM or ECM on the network. If there is no answer then the connection to ECU fails. There is no request to any other module(s) so even if the BCM and EBCM, Instrument Cluster and all the other modules are working the scanner app fails because it is only seeking the PCM/ECM.

It is possible your PCM is not answering due to a PCM power connection (there are more than one and 2 of them are required before the PCM will communicate). Or it could be a fault in the serial data line to the PCM or the yellow serial data wire between the PCM and the BCM.

There is a way to use Car Scanner as a terminal and check for network traffic to and from other modules,,, but it is not automatic. The App does not do the job, the user must type in certain specific commands to attempt communication with another module.

I checked the yellow connection cable between pcm and bcm with continuity and these to ground, but to ground they have no connection so I deduce that they are fine. I did the same with the data class 2 cables from the bcm and pcm to the sp205, checking that they are not grounded.
Could you tell me if the grounds from the negative terminal (3 thick cables come out, one to the body and the other 2 where they should be grounded?

 

[Mramses]

If I replace the bcm, should it connect with the pcm that I have without problems or will any anti-theft witness appear? I would like to know if the bcm and pcm are good.
I verified the 4 power of the BCM and the 2 lands too and everything is ok.

 

[TJBaker57]

but my values do not exceed 1 or 2 vol in dc.

This is normal. Test meters cannot read as quickly as the class 2 volts rise and fall.

 

[TJBaker57]

my values do not exceed 1 or 2 vol in dc

Here is a frame from my video above. With my meter set to 2000 millivolts this is equal to only 1.788 volts. You see, your readings around 1 or 2 volts is normal.

 

[Mramses]

friend help me with this. on pin 2 and pin 4 (black ground and purple data class 2) of the DLC when turning swtich gives me a resistance value that fluctuates between 85-90 ohm and then jumps to 118-120 ohm, but returns immediately to 85-90 ohm .
I have supposedly read that it must be between 55-60 ohm

 

[TJBaker57]

friend help me with this. on pin 2 and pin 4 (black ground and purple data class 2) of the DLC when turning swtich gives me a resistance value that fluctuates between 85-90 ohm and then jumps to 118-120 ohm, but returns immediately to 85-90 ohm .
I have supposedly read that it must be between 55-60 ohm

Is this measurement made with the combs in the splice packs?

 

[Mramses]

friend another test. if i disconnect the pcm and leave only the bcm connected to pin 2 of the DLC light green wire jumper with purple wire. it does not register neither resistance nor voltage. eye, but the pcm is disconnected from its 3 connectors.
Should I have voltage pulses and resistance between ground and pin 2 purple wire of the dlc?
I have no value
now, if i connect only the pcm and leave the bcm unconnected and i have jumper of the dark green cable with purple cable. I measure resistance on pin2 and pin4 of the dlc, I have resistance value 90 ohm and it jumps to 130 ohm returning to 90 ohm. and I have a small voltage pulse.
Could it be that the bcm is not sending the signal? he is not doing anything

 

[Mramses]

Is this measurement made with the combs in the splice packs?

consider what you told me now in all my tests and certainly those values are with only one polarity position. if I change the polarity it does not register values

 

[Mramses]

I have connected other modules and some do record resistance and voltage data between (-) pin2 and (+) pin4 of the dlc. testing each module with its respective jumper on the sp205 and the purple cable.
but when testing the bcm it does nothing, no resistance or voltage
will have my logical analysis? I think it doesn't matter if I test from the dlc or sp205 connector, if I connect one end of the tester to ground and the other end to the data class 2 line of each module, it should have a resistance value and a voltage. in my case ebcm, hvac aux and bcm

 

[TJBaker57]

friend another test. if i disconnect the pcm and leave only the bcm connected to pin 2 of the DLC light green wire jumper with purple wire. it does not register neither resistance nor voltage. eye, but the pcm is disconnected from its 3 connectors.
Should I have voltage pulses and resistance between ground and pin 2 purple wire of the dlc?
I have no value
now, if i connect only the pcm and leave the bcm unconnected and i have jumper of the dark green cable with purple cable. I measure resistance on pin2 and pin4 of the dlc, I have resistance value 90 ohm and it jumps to 130 ohm returning to 90 ohm. and I have a small voltage pulse.
Could it be that the bcm is not sending the signal? he is not doing anything

The PCM and the BCM are connected to each other independently of the splice pack by the yellow wire between them. You have tested the yellow wire between them for continuity. So connecting either of the dark green or the light green wire to the purple wire at the splice pack connects both the PCM serial data and the BCM serial data to the purple DLC connector pin 2. This should mean the difference in your test above is when the 3 PCM connectors are attached versus not attached.

The low voltage pulses are best seen when there is active traffic on the network. For the BCM this would be when there is a change of status like the key being inserted, the key being turned on or off, a door being opened or other action involving the BCM.

 

[Mramses]

could you help me with this test friend. disconnect the comb sp205 and test each module with the tester, one end to ground and the other end to each cable of the sp205 modules one by one. the tester must be in resistance of 200 ohm. When taking the readings the "good" modules should give a resistance value between 80-120 ohms and fluctuate. bad or disconnected module does not register resistance value
In my case I also have another PCM that was damaged in a repair shop trying to tell me what it was, and when I installed this PCM I did not register a resistance value unlike the other PCM that if it does, the latter is the one that turns on the check engine light

 

[TJBaker57]

could you help me with this test friend. disconnect the comb sp205 and test each module with the tester, one end to ground and the other end to each cable of the sp205 modules one by one. the tester must be in resistance of 200 ohm. When taking the readings the "good" modules should give a resistance value between 80-120 ohms and fluctuate. bad or disconnected module does not register resistance value
In my case I also have another PCM that was damaged in a repair shop trying to tell me what it was, and when I installed this PCM I did not register a resistance value unlike the other PCM that if it does, the latter is the one that turns on the check engine light

Here are my own readings. Key OFF

 

[Mramses]

Here are my own readings. Key OFF

View attachment 96894

I completely disconnected the pcm from the 3 connectors. so the yellow wire connecting the pcm to the bcm was left open. Then I measured resistance between the light green wire and ground. it did not give me any value.
but if I do the same procedure but for the pcm if it gives me resistance value

 

[Mramses]

Here are my own readings. Key OFF

View attachment 96894

Your measurements were with the negative terminal of the tester to ground and the positive terminal to the data class 2 lines of each module?
They are different from mine but it makes a lot of sense besides that they all give values that is as it should be

 

[Mramses]

Tomorrow I will check my measurements again but I think my bcm is damaged, friend. in addition to the ebcm, hvac aux