There is also a pressure switch assembly which tell the computer the actual gear the trans is in based on the gear shift position and any override decisions the trans may have. I suspect the computer/trans will go into limp mode and not shift at all if a solenoid burns out. a friend of mine has a prob with a 4L60E in a '99 4WD Tahoe. This process is known as adaptive learning or shift adapts and is similar to the closed loop fuel. By adjusting the line pressure, the PCM can maintain acceptable transmission shift times. The 4L60-E transmission utilizes a line pressure control system during upshifts to compensate for the normal wear of transmission components. Velvet Drive 71C/72C Torque SpecĬanyon08Z71.
4L60E Valve Body Rebuild Instructions 4L60E/4L65E Rebuild Kit Options GM 4L60E Hardware Torque Specifcations 4L60E Filter Style Guide 4L80E Hardware Torque Specifications Marine Transmission Information. To accomplish this, adjust the force motor solenoid After driving the vehicle, it may be necessary to make the shift firmer or softer. Test drive the vehicle to perform shift test.
4l60e anti clunk spring installation install#
Install MLPS and adjust according to the manufacturer's specifications. Still say ask dynamic396, he knows much more than I about the inner workings of the 4l60e EPC SOLENOID for AODE/4R70W '92-'97 76923 2.48 to 5.66 ohms 10. The pressure control solenoid, or its wiring to the pcm could be bad also. I was referring to the pressure valve thats in the pump itself, but you have a valid point also. g from the pump, when in drive ranges from Min: 55-65psi to Max:170-190psi from factory.Stabilizing pressure starts with precise valve-to-bore clearances (PR valve bore wear is common in 4L60/E units) and a quality, leak-free boost valve Pressure pulsation from poor PR valve control is the real danger, and a sure sign of this problem is gauge needle-bounce when testing line pressure.
4l60e anti clunk spring installation how to#
I think it is a simple adjustment and need advice on how to turn back the firmness I do not want to change the MAP in the PCM. It is too firm and want to reduce it to firm when I change fluids and filter. My original transmission builder increased the Line Pressure on my 4L60E for a very firm shift. T: tcc solenoid (on/off in pump) U: tcc pwm solenoid (valve body 4L60E Line Pressure Adapting - GearHead EF E: ignition power feed from TCM to solenoids. Transmissions plug pin identification 1995 and up. TCC PWM Solenoid TCC PWM solenoid is used to control fluid. Hydraulic pressure is regulated to smoothly release 3-4 clutch and 2-4 band during 3-2 downshift. In all other gears, 3-2 control solenoid is 90 percent on. The 3-2 control solenoid is off in first gear. Does this mean the PCS can only ever be in 1 of 2 positions? I was under the impression that the PCS would be post width modulated to get more varying fluid pressure or is this just not the case Control module modulates current (duty cycle) to control 3-2 control solenoid. The pressure control solenoid produces a torque signal pressure which determines the final transmission line pressure Looking at the pinout for the connector for the 4l60e there are 2 pins for the pressure control solenoid. The PCM can vary the current from 0.0 amps (high pressure) to 1.1 amps (low pressure). The pressure control solenoid (or force motor) is controlled by the PCM by varying the current flow to the solenoid. Home 4l60e pressure control solenoid adjustment
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