HOW DO WE MONITOR A SERIAL DATA LINE WITHOUT USING A SCAN TOOL
Feb 13, 2009 at 7:04 AM
2005 GMC C3500 SERIAL DATA
2005 GMC C3500
NBS AUTO REPAIR
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its hard to do without a scan tool but I will help as best I can.follow this info,Key in the off position
2) Use a dvom while reading resistance, put one lead with the correct probes on pin 6 of the aldl diagnostic connector and put the other lead on pin 14 at the dlc.
3) Measure the resistance results
If the resistance is out of limits (ol), look for a open in circuits 2500 or 2501 that runs from the dlc to the bcm on the LAN bus as per the wiring schematic. Repair as necessary.
4) The resistance value should be approximately 60 ohms +/- 10%. what problem are you having? no communication? need some more info.are you having a problem with the high and low speed LAN communication bus?post back with any other questions.
2) Use a dvom while reading resistance, put one lead with the correct probes on pin 6 of the aldl diagnostic connector and put the other lead on pin 14 at the dlc.
3) Measure the resistance results
If the resistance is out of limits (ol), look for a open in circuits 2500 or 2501 that runs from the dlc to the bcm on the LAN bus as per the wiring schematic. Repair as necessary.
4) The resistance value should be approximately 60 ohms +/- 10%. what problem are you having? no communication? need some more info.are you having a problem with the high and low speed LAN communication bus?post back with any other questions.
Feb 13, 2009 at 11:11 AM