TCC Oscillates > 70MPH
TCC Oscillates > 70MPH New 4L70E in a 03 Silverado that was a 5 spd.
Trans shifts fine and TCC applies above 40 > 45mph.
However as soon as I go over 70 MPH, the TCC starts oscillating On / Off every .5 or 1 second.
I can lock the TCC on with HP tuners scanner and it stays on. Everything in the scanner looks good going down the highway.
Anyone have any Ideas ?
I have Misfire disabled. With it on, the TCC would not come on due to the small cam.
Trans shifts fine and TCC applies above 40 > 45mph.
However as soon as I go over 70 MPH, the TCC starts oscillating On / Off every .5 or 1 second.
I can lock the TCC on with HP tuners scanner and it stays on. Everything in the scanner looks good going down the highway.
Anyone have any Ideas ?
I have Misfire disabled. With it on, the TCC would not come on due to the small cam.
Hooked up through brake switch ?
I would think that the ECM would know when the brakes are engaged and dis engage the TCC via the add on harness ? Tho I may be wrong ?
As for the Mode of the TCC ? I'll have to drive it again to find out that. Tho I do know I selected shift from 3 > 4th with TCC on. If that's a good thing or not.. ?
What should it be ? I seen no mode selection in the tune, other then Automatic 4L60E , which is what I selected .
Here again, I can lock it up and it stays on with HP Scanner .
I would think that the ECM would know when the brakes are engaged and dis engage the TCC via the add on harness ? Tho I may be wrong ?
As for the Mode of the TCC ? I'll have to drive it again to find out that. Tho I do know I selected shift from 3 > 4th with TCC on. If that's a good thing or not.. ?
What should it be ? I seen no mode selection in the tune, other then Automatic 4L60E , which is what I selected .
Here again, I can lock it up and it stays on with HP Scanner .
TCC Mode is a PID you data log. You have to determine if it is a PCM issue or a trans issue. If the PCM is commanding lockup and the converter is unlocking then it is a trans issue.
Hooked up through brake switch ?
I would think that the ECM would know when the brakes are engaged and dis engage the TCC via the add on harness ? Tho I may be wrong ?
As for the Mode of the TCC ? I'll have to drive it again to find out that. Tho I do know I selected shift from 3 > 4th with TCC on. If that's a good thing or not.. ?
What should it be ? I seen no mode selection in the tune, other then Automatic 4L60E , which is what I selected .
Here again, I can lock it up and it stays on with HP Scanner .
I would think that the ECM would know when the brakes are engaged and dis engage the TCC via the add on harness ? Tho I may be wrong ?
As for the Mode of the TCC ? I'll have to drive it again to find out that. Tho I do know I selected shift from 3 > 4th with TCC on. If that's a good thing or not.. ?
What should it be ? I seen no mode selection in the tune, other then Automatic 4L60E , which is what I selected .
Here again, I can lock it up and it stays on with HP Scanner .
I don't think it's a trans issue as I can keep it locked with HP Scanner.
As for the brake light wire, This would create an issue above 70mph ? As it locks fine until 70 .
As for the brake light wire, This would create an issue above 70mph ? As it locks fine until 70 .
