- G-Quest Member
#268 is finally alive - 06 SS/SC. I've spent the last couple of months trying to figure out the source of several electrically-related issues that caused a variety of problems - from turning over but not starting to no gauge output, etc.
Once I figured out that I had confused the low speed GMLAN with the low speed Serial GMLAN (all those dark green wires) I thought I was home free. Unfortunately that only got me a working ODBII port. I then started reviewing grounds (it's always the grounds). I found all of the grounds called out in the wiring videos connected successfully however I found two grounds in the fusebox that were not terminated. Running grounds to those connections has brought the LSJ to life along with the dash and all the button panel functions.
However, there are a couple of lingering issues that I'm looking for suggestions on how to attack:
1. The engine starts immediately with a twist of the key. However, when I turn the key off, the engine will continue to run for 3 - 4 seconds before shutting down. I can even blip the throttle in this shut down stage and get a response. This is nowhere close to the run-on caused by dieseling - it's more like the power to the coils and injectors is not being cut by the switch.
2. The clutch position switch circuit does not prevent the engine from starting with the clutch released.
3. The only code I'm finding is P2229 (barometric sensor voltage high) (I retained the evap system so those codes have not shown up.) I read where @Chubbs had the same code but his thread never reached a resolution.
If any of the Gurus out there have any diagnostic suggestion I am open to hearing them all.
Once I figured out that I had confused the low speed GMLAN with the low speed Serial GMLAN (all those dark green wires) I thought I was home free. Unfortunately that only got me a working ODBII port. I then started reviewing grounds (it's always the grounds). I found all of the grounds called out in the wiring videos connected successfully however I found two grounds in the fusebox that were not terminated. Running grounds to those connections has brought the LSJ to life along with the dash and all the button panel functions.
However, there are a couple of lingering issues that I'm looking for suggestions on how to attack:
1. The engine starts immediately with a twist of the key. However, when I turn the key off, the engine will continue to run for 3 - 4 seconds before shutting down. I can even blip the throttle in this shut down stage and get a response. This is nowhere close to the run-on caused by dieseling - it's more like the power to the coils and injectors is not being cut by the switch.
2. The clutch position switch circuit does not prevent the engine from starting with the clutch released.
3. The only code I'm finding is P2229 (barometric sensor voltage high) (I retained the evap system so those codes have not shown up.) I read where @Chubbs had the same code but his thread never reached a resolution.
If any of the Gurus out there have any diagnostic suggestion I am open to hearing them all.
