OBD II not connecting to truck
#1
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OBD II not connecting to truck
Hello everyone! I am new to the forum, & have seen a few threads that have touched on this issue, but here I go.
I have a 1996 Chevrolet 1500 Centurion Conversion Crewcab truck. The check engine light has come on & gone off for the past few weeks & I have had zero luck in trying to diagnose the issue using an OBD II diagnostic tool.
I've gone to a few different places to see if it was just a bad machine, but they all will not connect to the truck & read.
Does anyone know which wire off the back of the diagnostic port is the serial data port wire? If so I'm wondering if that wire isn't damaged & if I could jump that wire with a new wire & splice it in near the computer under the hood.
Any help will be greatly appreciated!
Thanks,
Andy
I have a 1996 Chevrolet 1500 Centurion Conversion Crewcab truck. The check engine light has come on & gone off for the past few weeks & I have had zero luck in trying to diagnose the issue using an OBD II diagnostic tool.
I've gone to a few different places to see if it was just a bad machine, but they all will not connect to the truck & read.
- I have checked the lighter fuse & it is ok
Does anyone know which wire off the back of the diagnostic port is the serial data port wire? If so I'm wondering if that wire isn't damaged & if I could jump that wire with a new wire & splice it in near the computer under the hood.
Any help will be greatly appreciated!
Thanks,
Andy
#2
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I would disconnect the battery for 90seconds and reconnect and see if the check engine comes back on. I could be a random fantom code . What engine is in the truck?
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#5
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Like I said...Disconnect the battery and see if the computer resets. If not then look for a another problem. Get a repair manual. Hayes manuals are around $30.oo and contain a wealth of info about your trucks systems and include wiring diagrams for the factory systems. Just my 2 cents. The folks on this forum have a lifetime of knowledge. Do some basic diagnostic work and then come back with some meaningful info and you'll get the help you need.
#6
does the scan tool power up? at the dlc check for power at pin 16 orange wire. it should have battery voltage. check for grd at pin 5 black/white. the uart data line is pin 9 tan. the class 2 data line to the ecm is pin 2 purple wire.
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