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On that vein I have seen similar problems with certain aftermarket devices too. I remember a remote start that I had on one truck that while functioning just fine, put so much noise and chatter on the data bus that no scanner could be used until it was first disconnected.
well if you use a 2 channel scope set one channel to the positive data channel of the module you are troubleshooting and the second channel to the negative data channel. the wave form should mirror each other as in opposites if they don't then you need to dig deeper into that module and its connected accessories.
well if you use a 2 channel scope set one channel to the positive data channel of the module you are troubleshooting and the second channel to the negative data channel. the wave form should mirror each other as in opposites if they don't then you need to dig deeper into that module and its connected accessories.
I will be using a one-channel scope, break-out-box and a fused jumper wire. Once I access Splice Pack 205 to start with I hope to find the anomaly. If it does not exist by isolating each pin that is being used further analysis will be necessary.
well you can do the procedure with a 1 channel the signals should still mirror each other on the positive and negative bus. just not as convenient to visualize as when both are on screen to look for any nuances between them.
Guess its possible that a module is corrupting data comms, but surely you would have seen some issues in your vehicle, so it still doesn't make sense.
One thing you could do is buzz-out the cable on the TECH2 itself, I've buzzed my cable and sketched the pinout (see attached PDF)
It wouldnt take long to check.
Also if you power-up the TECH2 on the bench, go to say "F2 Chassis"->"F1 Air Suspension"->"F1 Data Display" and check the signal on Pin2 (Data) and Pin 4 or 5 (GND) you should get something similar to that shown below. This signal looks a bit poor as its un-terminated but at least it would prove-out the TECH2 comms side and its easier than accessing SP205.
This is great information; however, I need clarification. What do you mean by “buzz-out” the cable on the Tech2? Since you attached the .pdf with the two sketches, I presume the second sketch, which is applicable to my situation, would accept bench power at pins 16 and 4 or 5.
I would then probe either pins 4 or 5 to obtain a waveform. Am I understanding this correctly?
