PCS tranny controller for 4l60e/4l80e

[DaveP]

Re: PCS tranny controller for 4l60e/4l80e

There are two other connectors that are smaller and go to the other two sockets on the transmission. One Is for VSS or Transmission speed input and has (orange/red & black/white) wires on a black two prong connector . The other is TURBINE SPEED or TCC Speed Input which has (orange/lt. green) wires on a black two prong connector.

Which one goes where?

VSS is the REAR.
Turbine speed is the FRONT

I would wait for one other peep to confirm this, but I'm sure I'm correct.

 

[SY-1193]

Re: PCS tranny controller for 4l60e/4l80e

Thanks gentlemen.

 

[denny]

Re: PCS tranny controller for 4l60e/4l80e

I figure it out and got the MAP and CLT working. Event thought the 4l80e harness had the two wires label CTL and MAP , you have to configure the analog inputs 2 and 3 for MAP and CLT, weird..

 

[tbauer03]

Re: PCS tranny controller for 4l60e/4l80e

Very few wires to tap into the stock ecm. They include.

Description / Wire Color / What terminal to tap into on syty harness

• Sensor ground........BLACK/WHITE .........B6
• RPM...................ORANGE/BLACK.........D8
• TPS..................YELLOW/BLACK...........F13
• MAP..................YELLOW/RED..............F15
• CLT..............YELLOW/LT.GREEN..........E16
• 12 Volt Ignition source
• Ground

I hooked all the above connection up for my 4l60e but what is controlling the TCC? Did I forget to wire something because it feel like it is not locking up.. the 4l60e does not use the TCC Speed sensor only the VSS.

 

[Quickstop [UK]]

Re: PCS tranny controller for 4l60e/4l80e

TCC lockup is configured within the PCS module as one of the settings.

 

[tbauer03]

Re: PCS tranny controller for 4l60e/4l80e

(This is in regards for a 4l60e Install) When I hooked up my controller I spliced a vss pigtail off of a junkyard car into the pcs vss wiring harness this worked to control the transmission but left me no speedometer on the dash. I figured my speedometer wasn't working because i bypassed the oem wiring so today I spliced the OEM wiring into the PCS wiring so that they would share the output from the vss. Now my dash nor the pcs controller picks up the speed signal and the truck wouldn't shift out of first as a result. After that idea failed I read more into it and noticed the pcs has a speedometer output wire (Orange/White). 3 questions. If I switch the wiring back to how I had it where just the pcs wiring is the only thing plugged into the VSS connector, Where do I run the Orange/White wire to power the speedometer. 2) Should the way I spliced both the oem and pcs wiring into the VSS connector work assuming all my connections are good 3) If both ways work which way is best?

 

[Quickstop [UK]]

Re: PCS tranny controller for 4l60e/4l80e

I think you're creating more work here.

The orange/white wires for the speedo - take a pic - did they come with a connector? My harness did and it doesn't go to anything as far as I could tell. My dash works and so does the PCS unit.

I didn't have to splice anything extra to get a speed input - the VSS/TOSS went into the trans and I spliced all the wires that you did. I didn't need to take a speed signal and splice that as well.

Find where the ECM get the speed from and go from there. Sounds like you have a short in the VSS lead.

 

[tbauer03]

Re: PCS tranny controller for 4l60e/4l80e

I think you're creating more work here.

The orange/white wires for the speedo - take a pic - did they come with a connector? My harness did and it doesn't go to anything as far as I could tell. My dash works and so does the PCS unit.

I didn't have to splice anything extra to get a speed input - the VSS/TOSS went into the trans and I spliced all the wires that you did. I didn't need to take a speed signal and splice that as well.

Find where the ECM get the speed from and go from there. Sounds like you have a short in the VSS lead.

The orange/white wire is the unterminated wire # 9 in that diagram above. The 4L60e does not have a VSS or TOSS like the 4l80e. The VSS is on the transfer case which requires a different connector than the one provided in the universal kit. The transmission shop told me to just splice the oem connector to the pcs wiring and I did that. I figured I if I used a connector from a donor vehicle I would avoid cutting up more of my factory harness. When my speedometer wasn't working I seconded guessed my actions and thought maybe they meant I need to splice into the wiring and not just cut off a connector and plug it in.
This unresolved post by eviltwin might help.http://www.syty.net/forums/showthread.php?t=82767&highlight=speedometer+aftermarket
Maybe I had it hooked up right the first time and there is an issue with my drac output to the dash. because at first the tcu was picking up the proper speed signal but not the dashboard.

 

[DaveP]

Re: PCS tranny controller for 4l60e/4l80e

I don't have any practical experience with these controllers. But I do know a little about electrical, and know how these speedos work, and the differences between 4L80e and 4L60e VSS.

The unterminated #9 orn/wht seems like it should be the output to the speedo. You could check it with a VOM on AC scale. At very low wheel speeds, you should see a 'pulsing' AC voltage. Increase the wheel speed, and the pulses should quicken. The wire to the speedo can be found at the DRAC. It is blu/blk. The speedo requires 128,000 pulses per mile to be properly calibrated. Hopefully, there is a way to calibrate the speedo output within the PCS software.

The next idea would be to use the original DRAC to drive the speedo. Try connecting the grn/blk and pur/wht wires to the t-case VSS. Piggy-back them onto the existing pair that goes to the PCS controller. I have no idea if this will work. I don't know if the two devices (DRAC and PCS) can be "paralleled" like this. But if it works, that would solve your problem.

Also, I don't know what your engine management is. But a stock ECM requires a speed input. It is used for the TCC (not needed for your app) and IAC operation. With no speed input, the engine may stall upon rapid deceleration. And you'll set a Code 24. The solution to this would be use the DRAC.

Good Luck. I like the 4L60e. It will be interesting to see how it does in a SyTy.
DaveP

 

[JSM]

Re: PCS tranny controller for 4l60e/4l80e

The speedo should work factory off the VSS on transfer case with a 700, 60e, or rubber band. I would agree with Mark in you created more work for yourself.

The 60e should still have a output shaft speed sensor I believe, the PCS would use that and harness should have come with the plug for it. Granted I have not messed with 60e yet. Worse case I would have tied into the VSS on transfer case and grabbed a signal there.

 

[DaveP]

Re: PCS tranny controller for 4l60e/4l80e

The 60e should still have a output shaft speed sensor I believe.

Jeff: No, It does NOT. That is this guy's dilemma. That's why he's confused. He needs to drive TWO systems from only ONE VSS. The one on the T-case.

I did some additional research on the PCS site. It appears you can configure one of the digital outputs to drive a speedo. Their notes say this may need to be done on GM's, if the #9 orn/wht is not 'strong' enough. Another possibility might be to use the ECM speed output from the DRAC to drive the PCS speed input. And put the VSS/DRAC system all back to stock configuration.

Last note for those of you that don't understand yet: The 4L60e does not have a VSS in the case like a 4L80e does. The VSS on a 2WD is in the extension housing, and the output shaft is about 18" long. But because the output shaft is so short (about 4') on a 4WD, there is no room for a VSS or the tone wheel in the adapter housing. So the VSS is moved to the T-Case.
DaveP

 

[tbauer03]

Re: PCS tranny controller for 4l60e/4l80e

I took apart the connections I made and tested out different combinations using test leads on the VSS connector. I can send the signal to either the drac or the pcs controller but when I try to do both I get nothing. When I send the signal to the pcs controller I can see the mph on my laptop and the truck shifts fine. I put the truck up in the air and measured the voltage on the orange/white wire and with the truck in gear and the brake applied I see zero volts when the brake is lifted and the wheels are in motion the voltage settles around 6.7 with the computer telling me the truck is moving about 7 mph. So this Orange/White wire appears to be analog and I would guess it could control the speedometer by tapping into the pracs blue wire but that would bypass the oem speed system and only send a signal to the dash so how would the stock ecm know how fast the truck is moving? If I also tapped that orange/white wire into the brown ecm wire BC6 it might do what I want but before I assume anything else I would like answers before doing anything stupid. Last time I called RPM they told me it was just a few wires to splice together but they did not mention this and I wasn't deep enough into the install to ask the right questions. On Monday I am sure rpm (rustynail) can walk me through this when his shop is open. Until then I will post this up maybe someone will chime in or others will learn from it. Thanks.

DRAC Wire Diagram

No VSS Output On the 4l60E, Only the main electrical connector.

 

[Quickstop [UK]]

Re: PCS tranny controller for 4l60e/4l80e

The orange white wire goes to the speedo - check it with the wheels turning like you did before.

Then you can configure one of the Digital Outputs (in the PCS calibration go to Transmission setup -> PWM/Digital Outputs -> Digital 4,5 or 6) to a speedometer output. Set it to ground).

Looks like you can use the digital output to drive the ECM - splice digital 4 into the BC6 brown wire to the ECM.

This bypasses the DRAC entirely so:

grn/blk (VSS) -> PCS

orn/wht = speedo,
pink/lt blue (Digital 4) = Brown/BC6(ECM)

You can setup the signal on the speedo output using the internal calibration. It's set to 2000 per mile and can be changed in the calibration wizard.

According to the diagram above, Code 24 says that cct 437 (the brown wire to the ECM) pulses at 2000 per mile. The PCS will ground it in the same way the DRAC would.

I have to say, I'm surprised that the GRN/BLK splice from the VSS can't drive both. Annoying, but now you can delete the DRAC entirely.