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Grand Prix Facebook Pages

ADrugDealer

ADrugDealer

Schooner Tuner
They are a joke, dont join them. Someone asked a simple question about why is 04+ was loosing CAN Bus connection, I answered with 3 possible casues and why/fixes.

Someone with "4 years Auto Tech EXP" decided I was "A ****ing moron" and "The issue is 'too many devices plugged into the CAN Bus" and they switched to a 3 wire system in 05-08 so there isn't an issue anymore. LIKE WTF?!

First off your are aruing with someone who has A) Enough expierience in CAN Bus and VPW systems to tell you more than you ever needed to know, let alone the CAN Bus protocol is the same between all 04-08. Its standardized. Maybe they were having a problem with not enough throughput on the system but that isn't going to be caused by one thing plugged into the system that is scanning two pids.
B) An Electrical Engineer. Seriously.

Anger anger anger, Rant rant rant. morons morons morons.

/Rant.
 


Yeah they have 11 second cars with 32" rims. A 1400 hp 3800 GP GTP that sounds like a V8. You can put just a supercharged engine in a n/a car without any tuning. Cold Air Intakes and Exhaust add tons of power. The list of stupid goes on.

Oh yeah and

dd13d1ddd9596029e7b4c85163e36333.jpg
 
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It's fun to laugh at people sometimes. Kinda like when you go to Walmart but don't really need anything and find yourself spending most of the time wonder how most of these people have survived that long.
 


Care to elaborate on your rant a little? Unless the facebook fools are only talking about GXPs, 04-07 3800's don't have a CAN bus, only 05-08 GXPs and 08 3800's do...

Also, the 04-05 3800s have a known issue about running too many devices can bog down the throughput enough to screw up your dash gauges and TCS because the PCM can't communicate fast enough. But this is usually from 3+ devices with high refresh rates.
 
When i realized there were grand prix clubs on facebook i thought it was cool, but the more I go on there, The less I want to come back. I have found myself leaving most of the groups I was part of and am now down to 2 groups. I think if we are going to be part of a grand prix group on facebook we should all pick one or two and consolidate. that way when stupid people act like themselves it is easier to gang rape them.
 
SgtMarshal said:
When i realized there were grand prix clubs on facebook i thought it was cool, but the more I go on there, The less I want to come back. I have found myself leaving most of the groups I was part of and am now down to 2 groups. I think if we are going to be part of a grand prix group on facebook we should all pick one or two and consolidate. that way when stupid people act like themselves it is easier to gang rape them.
Click to expand...


Gang rape them? LOL
 
the 05.5+ "3 wire" was actually CAN. 04+ all have CAN bus in the PCM/active at the pins...the oem harness just doesnt use them instead keeping the serial bus during the switchover (shades of obd1.5 or Eobd2 transitions)

just be glad they didnt **** the proverbial football like they did back with the 1 to 2 changeover

ive had more than a few issues with alarm/remote starter systems tied into the CAN...if those ****ers dont ground the module properly...and ground loop voltage issues wreak all sorts of havoc on the bus....hell i found some joint had cut and twisted em in instead.

his issue of intermittent no comm is likely related to pin/plating fretting of the ****ty undersized micropack connectors....there's a TSB on it....clean/lube/reconnect and if its bad enough replacement of the terminals on both connector halves

basically the fix is to unplug and replug all your connectors that the bus passes through.

try explaining to a customer that after an hour of diagnostic work you cant get the vehicle to simulate the problem anymore....and that something like unplug and replug brings back memories of nintendo cartridges...
 


huh go figure i found it with working pics
http://www.gminsidenews.com/forums/f53/how-common-fretting-corrosion-105260/#post2379747

2005-09
All Vehicles - Diagnosing and repairing fretting corrosion
Do this--- Disconnect affected connector and apply lube
Dont do this--- Don't replace modules without duplicating condition
09-06-03-004




Fretting corrosion is a buildup of insulating oxidized debris (nonconductive material) caused by micro motion between two contact surfaces. (Fig 1)


It's commonly found on tin plated terminals, such as Micro pack 100and Micro pack 64 connections.


Past Serviceability Issues

Replacement of sensors, modules and other components will result in only a temporary relief of a fretting issue. Actually, just the cycling of a connector will clear the fretting corrosion from the terminal, correcting the condition for a short time until fretting corrosion builds back up again.

Typical issues caused by fretting corrosion include:
- Intermittent electrical component operations
- DTCs being set, or No Trouble Found (NTF)
- Low current signal circuits -- fretting corrosion (high resistance) can cause intermittent connections
- High currentpower circuits -- permanent increases in the connection resistance can lead to overheating


Evidence of Fretting

Fretting usually appears as:
- small, dark smudges on electrical terminals
- smudges at the locations of electrical contact (Fig. 2)

(Fig. 2)

In less severe cases, it may require a magnifying glassto identify a fretting condition.


Causes of Fretting

Fretting is caused by the motion between the connector and the terminal, which can be due to:
- Vibration - micro motion between two contact surfaces causing build up of insulating oxidized debris (nonconductive material)
- Thermal cycling
- Packaging of the connector, wiring harnessand/or device
- Poor connection/terminal retention


With continued microscopic fretting, enough insulating tin-oxide wear debris can build up high resistance creating intermittent connections. (Fig. 6)


Service Solution

Disconnecting and reconnecting a connector will temporarily "fix" a fretting condition, but it will eventually come back if the conditions for fretting still exist. The best preventative measure is to perform the following:
1. Disconnect the appropriate module(s)/connector(s)
2. Lube both sides of the connector (module side and harness side) with NyoGel® 760G lubricant, GM part number 12377900 (in Canada, P/N 10953529)
3. Reconnect the connector
4. Wipe away any excess lubricant
5. Duplicate the condition per the SI Diagnostic Procedure Instruction section
- Circuit/System Description
- Conditions for Running/Setting the DTC
- Circuit/System Verification

IMPORTANT: If the condition CANNOT be duplicated, the repair is complete. DO NOT replace the module/component/part.
 
Sweet! The base of the argument was this:

I installed an aftermarket radio in my car. Apparently this also causes the bus on 04s to stroke out and loose gauges, tc, abs etc, I have also had it where a poorly engineered OBD device will also cause this symptom. I stated this in a post. Guy proceedes to freaaaakk out and call me a "****ing idiot" because I am wrong, he is a 10+ year auto tech and its because the guy has too many things running causing the bus to "jam up". Commence large argument of me trying to be reasonable and him just going off.. I just left the page and stopped replying lol
 
Thats what I though, seems to happen very randomly... but if you install the factory radio in the trunk with a data line and a few other lines its happy again. Who knows.
 
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