***GM Diagnostic assistance***

[Gmtech1005]

If anyone has any trouble codes let me know and I can get you GM diagnostic help. I am a Pontiac tech, but I can get all help charts for any GM car. 1996 to 2002. Anything before will be difficult to find, but ask anyway and I'll see what I can do.

[sac2165]

That's Awesome [img]graemlins/thumbsup.gif[/img]

[Jerriko]

Ok, well I can help out. I have access to AllData and can fill in any gaps that you don't cover.
Jim

[99Camaro99]

<blockquote>quote:</font><hr>Originally posted by Gmtech1005:
If anyone has any trouble codes let me know and I can get you GM diagnostic help. I am a Pontiac tech, but I can get all help charts for any GM car. 1996 to 2002. Anything before will be difficult to find, but ask anyway and I'll see what I can do.<hr></blockquote>

hey can you hit me up on AIM sometime (Quantex008). I'd like to "pick your brain" on a few things with a 1999 Camaro's PCM. Thanks. [img]graemlins/thumbsup.gif[/img]

[ December 05, 2002: Message edited by: 99Camaro99 ]</p>

[azrscamaro]

i got one for you its a p1870 tranny code

[tWiStEdBird]

Originally posted by azrscamaro:
i got one for you its a p1870 tranny code

I've seen threads brought back from the dead, but ****, this thread was already decomposed.. Good job.. Only 2 years late on this one. :rolleyes:

[Need4Camaro]

If you got AIM, gimme a shout at "Need4Camaro"... I got a few codes to throw at you..

[azrscamaro]

does anyone know what a VAF is i forget the code that came up but it was something about my VAF

[CARdiac]

Originally posted by Gmtech1005:
If anyone has any trouble codes let me know and I can get you GM diagnostic help. I am a Pontiac tech, but I can get all help charts for any GM car. 1996 to 2002. Anything before will be difficult to find, but ask anyway and I'll see what I can do.

Here is one, I throw EGR solenoid 2 and 3 codes all the freaking time...when I monitor the EGR w/my code scanner I can see 2 and 3 functioning...then i get on the hwy and coast and get codes....the EGR is new, the tube is new...wtf is going on?

[Ian]

You guys have to be kidding me:

posted December 05, 2002 12:03 AM

that was the original post date. this thread is 2 years old. kill it. this guy probably has a different job and kids now. man...........

[tWiStEdBird]

[img]graemlins/omg.gif[/img] After my comment to the guy who brought it back from the dead I thought people would realize how old it was.... :rolleyes:

[Coriya71]

DTC P1870 Transmission Component Slipping 3.8L VIN K




Circuit Description
The PCM monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match transmission output speed. In D4 drive range with the TCC engaged, TCC slip speed should be between -20 and +20 RPM.

When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type A DTC.

Conditions for Setting the DTC
The following conditions are met for three TCC cycles with reported excessive TCC slip conditions:

No TP DTCs P0122 or P0123
No VSS DTC P0502
No TFT sensor DTCs P0172 or P0173
No 1-2 SS Valve DTCs P0751 or P0753
No 2-3 SS Valve DTCs P0756 or P0758
No TFP Valve Position Switch DTC P1810
No TCC PWM Solenoid Valve DTC P1860
No TCC Solenoid Valve DTC P1864
The engine speed is greater than 400 RPM for 8 seconds and not in fuel cutoff.
The engine vacuum is 0-106 kPa.
The engine torque is 50-500 lb ft.
The gear range is D4.
Not in 1st gear
The TP angle is 9-35%.
The TFT is 20°-120°C (68°-248°F).
The TCC is ON for greater than 5 seconds.
The TCC is at maximum apply for greater than 5 seconds.
The Shift Solenoid performance counter is zero.
The TCC slip speed is greater than 175 RPM for 7 seconds.

Action Taken When the DTC Sets
The PCM inhibits TCC engagement.
The PCM commands maximum line pressure.
The PCM inhibits 4th gear if in hot mode.
ThePCM freezes shift adapts from being updated.
The PCM illuminates the Malfunction Indicator Lamp (MIL).

Conditions for Clearing the MIL/DTC
The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

[ August 12, 2004, 10:14 PM: Message edited by: Coriya71 ]

[wantmorepower]

Are you still offering help figuring trouble codes????

How about P1406 and P1441 am geting both of these and so far cant figure out what they are refering to.

[98goldbird]

Hahahaha! Kill this post!

[rick herrick]

I see where you are a GM tech GMtech1005, thought I would ask you a question that I have asked on other forums, but I haven't gotten a response from a GM tech to my knowledge, so here it goes, I have a 96 3.8 and often but not always the engine will have a momentary engine rattle that lasts for 4-5 seconds and then go's away. The problem is in my opinion the extremely high rpm start up (1900rpm) that the engine does after the engine starts and the engine starts almost immediately after the engine is cranked. I have been able to stop it if I delay the starting of the engine (I installed a fuel pressure switch), but it is not practical to crank the engine for 5 seconds in the morning. I'am not sure exactly where the noise is coming from in the engine, but the noise on morning start up usually occurs mainly after I do some highway driving for 2-3 hours, and then the following morning the noise occurs. The noise strangely will slowly go away if I revert back to my normal daily driving pattern of 7-10 miles stop and go. This is the second 3.8 engine that the car has had (the first changed under warranty for the same problem) and after 8-10,000 miiles on the new engine the problem is back. I told the service manager that unless they solve the initial high rpm (1900 rpm) start up issue the problem is probably going to come back, he didn't seem to concerned about that and it wasn't addressed. When I went back to the dealership with the same problem (engine rattle) he now say's that is normal, of course the car is out af warranty now, and I'am sure that had something to do with his statement. First of all, does anybody else experience this problem with their 3.8 camaro? Second does anybody have any solution as to lower the initial start up rpm? After maybe 2-3 seconds the engine rpm does drop and fast idle's properly @12-1300rpm until the engine is warmed up. I have tried to fool with the IAC motor as I have in the past on other cars I have had, but with this OBD 2 computer it reverts back to the original setting, which is that stupid high rpm. With the older OBD 1 computer you could adjust the IAC motor to the desired fast idle number you wanted and it would stay there, but not with this system. I have checked the throttle body for leaks and have set the throttle plate also, to no avail. I believe the problem is probably in the computer mapping, but only a guess. I have had a scan tool (tech 1) on the engine several times and everything seems fine. I'am a school bus mechanic, not a chevy wrench so I don't have access to their equipment or their tech representatives. Being that both engines had and have the same problem I have to think other owners of the 3.8 engine have this problem also. Any thoughts? Does anybody have any good clues as to what the engine noise is? My guess is maybe rocker arm. I do use a good 5-30 oil (not systhetic though). Why is the problem not consistant, and finally does anybody have any opinions on how I can lower the initial start up rpm? I know this is rather lengthy but it required me to fully explain the issue. It took me some time to just find a web site that MAYBE people might be able to help, the dealerships are of no help and the 800 number for chevy service complaints is a joke. Thankyou, Rick Herrick
--------------------------------------------------------------------------------