Help! Trans/VCM issues TSB 667103
#1
01-30-2008, 01:36 PM
Help! Trans/VCM issues TSB 667103
I'm posting for my bf who has a 1996 Blazer 4wd. He replaced the trans last July and now it's slipping/revving and having general shifting issues.
After talking with the company about warranty procedures, we discovered there was a TSB bulleting that was supposed to fix the exact problems he was having.
We bought the part ($45 for a single 12" wire and sticker!) and tried to install it according to instructions. Here's the problem:
Instructions say to move wire from connector j3 (white) pin 18 to connector j3 (blue)pin 23 in the VCM. There is already a wire in J3, pin 23.
Same thing for the replacement wire. The jump wire was supposed to go from J3-18 to J2 (red) 26, but again, another wire is already in place in J2-26.
We followed the wires, and this is NOT a pervious fix. The instructions are worded as if there were not supposed to be any wires in these locations and to punch the cap so a new wire could be inserted. If we connect the replacement wire as instructed, there would be two wires (the ones already there) dangling.
Does each pin location have a specific function, or could we insert these dangling wires into an empty pin?
Help ASAP!! Por favor!!
Thanks,
Alanna
After talking with the company about warranty procedures, we discovered there was a TSB bulleting that was supposed to fix the exact problems he was having.
We bought the part ($45 for a single 12" wire and sticker!) and tried to install it according to instructions. Here's the problem:
Instructions say to move wire from connector j3 (white) pin 18 to connector j3 (blue)pin 23 in the VCM. There is already a wire in J3, pin 23.
Same thing for the replacement wire. The jump wire was supposed to go from J3-18 to J2 (red) 26, but again, another wire is already in place in J2-26.
We followed the wires, and this is NOT a pervious fix. The instructions are worded as if there were not supposed to be any wires in these locations and to punch the cap so a new wire could be inserted. If we connect the replacement wire as instructed, there would be two wires (the ones already there) dangling.
Does each pin location have a specific function, or could we insert these dangling wires into an empty pin?
Help ASAP!! Por favor!!
Thanks,
Alanna
#2
01-31-2008, 06:25 PM
RE: Help! Trans/VCM issues TSB 667103
#00-07-30-026 - (12/21/2000) Automatic Transmission 1-2 and/or 2-3 Upshift Slip/Flare, No 3rd or 4th gear, Launch Shudder (Revise VCM Wiring)
1996 Chevrolet and GMC C/K, S/T, M/L, G1, G2, P3 Models
1996 Oldsmobile Bravada
with VCM and 4L60-E (M30) or 4L80-E (MT1) Automatic Transmission
This bulletin is being reissued to ensure that correct procedures are followed for this condition. Please discard Corporate Bulletin Number 66-71-03A (Section 7 -- Automatic Transmission).
Condition
Some owners may comment that the automatic transmission has either a slip or flare on the 1-2 and/or 2-3 upshift, or no 3rd or 4th gear, or launch shudder. Upon investigation, the technician may find a DTC P1870 stored in the VCM.
Cause
A poor internal ground between the two circuit boards of the VCM may cause the VCM to command erratic line pressure at the pressure control (PC) solenoid valve.
Correction
Using harness jumper wire and instruction kit, P/N 12167310, revise the wiring harness at the VCM connector. Corrections were made to the VCM beginning 2/14/96. The corrected VCMs are identified with service number 16244210 on the VCM identification label.
Procedure
The following is a summary of the instructions included with the service kit:
1. Remove the negative terminal from the battery.
2. Move the wire located at connector J3 (WHITE/GREY/CLEAR), pin 18 to connector J1 (BLUE), pin 23.
3. Install the jumper wire between connector J2 (RED), pin 26 and connector J3 (WHITE/GREY/CLEAR), pin 18.
4. Install the tag included in the kit around the VCM wiring harness. This tag notes that the wiring harness has been modified.
5. Reconnect the negative battery terminal.
Road test to verify that the condition has been corrected. If any of the following conditions are noted, the transmission should be repaired or replaced using the most cost effective method. Canadian dealers should repair the transmission.
1. Transmission fluid oxidation or excessive sediment.
2. Transmission slip or flare after this service fix is performed.
3. DTC P1870 is stored on a 4L60-E (M30).
The following tools are available from Kent-Moore (1-800-345-2233) for use in removing and relocating the VCM wires:
1. J 41758 Terminal Tool; used to remove the wire from the VCM connector.
2. J 41759 Punch; used to punch a new hole through the connector seal.
Parts Information
Part Number: 12167310
Description: Harness Jumper Wire Kit
Qty: 1
1996 Chevrolet and GMC C/K, S/T, M/L, G1, G2, P3 Models
1996 Oldsmobile Bravada
with VCM and 4L60-E (M30) or 4L80-E (MT1) Automatic Transmission
This bulletin is being reissued to ensure that correct procedures are followed for this condition. Please discard Corporate Bulletin Number 66-71-03A (Section 7 -- Automatic Transmission).
Condition
Some owners may comment that the automatic transmission has either a slip or flare on the 1-2 and/or 2-3 upshift, or no 3rd or 4th gear, or launch shudder. Upon investigation, the technician may find a DTC P1870 stored in the VCM.
Cause
A poor internal ground between the two circuit boards of the VCM may cause the VCM to command erratic line pressure at the pressure control (PC) solenoid valve.
Correction
Using harness jumper wire and instruction kit, P/N 12167310, revise the wiring harness at the VCM connector. Corrections were made to the VCM beginning 2/14/96. The corrected VCMs are identified with service number 16244210 on the VCM identification label.
Procedure
The following is a summary of the instructions included with the service kit:
1. Remove the negative terminal from the battery.
2. Move the wire located at connector J3 (WHITE/GREY/CLEAR), pin 18 to connector J1 (BLUE), pin 23.
3. Install the jumper wire between connector J2 (RED), pin 26 and connector J3 (WHITE/GREY/CLEAR), pin 18.
4. Install the tag included in the kit around the VCM wiring harness. This tag notes that the wiring harness has been modified.
5. Reconnect the negative battery terminal.
Road test to verify that the condition has been corrected. If any of the following conditions are noted, the transmission should be repaired or replaced using the most cost effective method. Canadian dealers should repair the transmission.
1. Transmission fluid oxidation or excessive sediment.
2. Transmission slip or flare after this service fix is performed.
3. DTC P1870 is stored on a 4L60-E (M30).
The following tools are available from Kent-Moore (1-800-345-2233) for use in removing and relocating the VCM wires:
1. J 41758 Terminal Tool; used to remove the wire from the VCM connector.
2. J 41759 Punch; used to punch a new hole through the connector seal.
Parts Information
Part Number: 12167310
Description: Harness Jumper Wire Kit
Qty: 1
Remove J3 (gray) Pin 18 (black/white - engine ground) to J1 (blue) Pin 23 (OPEN)
The jumper wire goes from J2 (red) Pin 26 (OPEN) to J3 (gray) Pin 18 (now OPEN)
The pinouts I just looked up in my references state that J2-26 is open as well as J1-23... What color are the wires that are in these locations? And are you sure you are properly identifying the cavity locations?
Let me see if I can get the pinout info for you.
That should get it done for ya!
*EDIT* - Check out the pin-outs below:
C1 - Blue (called J1 in the TSB)
C2 - Red (called J2 in the TSB)
C3 - Gray (called J3 in the TSB)
#3
01-31-2008, 07:54 PM
RE: Help! Trans/VCM issues TSB 667103
Hello! Thanks for the reply. I actually printed out your instructions a couple days ago and that was what I used. It was my typo about J3 blue ... But, we did count and recount the pins. However, I'll do it again this weekend ... third time's the charm, right?
I'll also make note of the wire colors, I think the first one inblue pin 23was black and the second wire in the red pin 26 was tan.
Thanks for your assistence. If this jumper wire doesn't fix the prob, our next step is to do a tranny oil pressure check for a bad solenoid.
Gracias!
Alanna
I'll also make note of the wire colors, I think the first one inblue pin 23was black and the second wire in the red pin 26 was tan.
Thanks for your assistence. If this jumper wire doesn't fix the prob, our next step is to do a tranny oil pressure check for a bad solenoid.
Gracias!
Alanna
Thread
Thread Starter
Forum
Replies
Last Post
pkrawetz
2nd Generation S-series (1995-2005) Tech
9
08-09-2007 07:34 AM
