How does the EPC work on a transmission line?
How does the EPC work on a transmission line?
It then pulses this solenoid on and off to raise or lower line pressure according to demand. The EPC controls a pressure regulating spool valve and spring that holds or releases fluid pressure, typically to the transmission’s sump. It’s a variable force solenoid that changes at a rate of around 32 Hz…
How does the EPC Electronic Pressure control solenoid work?
The EPC Electronic Pressure Control Solenoid. Today’s electronic transmissions use a control module to control transmission line pressure, shift timing and quality. It receives inputs from sensors like the MAF or MAP, VSS, and ECT and then compares them to information stored in its memory.
Why does my EPC have a high duty cycle?
EPC Duty Cycle High line pressure is often the result of an unplugged or damaged circuit leading to the solenoid. The control module pulses the solenoid longer with a high duty cycle to reduce line pressure (~70-80% on-time) and a shorter duty cycle to increase line pressure. The longer it’s on, the lower the pressure.
Where is the shift solenoid on an automatic transmission?
When it’s time to shift, the transmission control unit sends out power or ground to the required shift solenoid, and it causes the solenoid to open and let the transmission oil flow into the valve body, which then shifts to the next gear. The Transmission shift solenoids are located inside the valve body of your automatic transmission.
What happens if I remove the wire to the TCC solenoid?
You just lose the lock up torque converter function which will reduce fuel mileage. If the TCC solenoid is sticking causing the engine to stall at idle, you might try this. Purchase a can of SeaFoam TransTune and add a half a can to the transmission fluid.
How to troubleshoot a transmission shift solenoid problem?
Using a diagnostic scanner is a must when it comes to shift solenoid related problems. Here is a list of how you can carry out the troubleshooting with a scanner: Find a transmission wiring diagram for your transmission. Find out which pins are going to the affected shift solenoid.
Where are the solenoids located in a transmission?
When the TCM triggers this coil, the plunger moves, allowing pressurized hydraulic fluid to flow to certain parts of the transmission. This allows the transmission to shift into the desired gear. There are two or more shift solenoids inside your transmission. The solenoids are typically integrated into the transmission valve body.
How much does it cost to replace a shift solenoid?
In the picture above, you see the shift solenoids located on the valve body. The shift solenoids are the tubes with yellow, green, and black colors. A single shift solenoid’s replacement cost is between 100$ to 350$ and a shift solenoid pack costs between 400$ to 700$, including transmission fluid, filter, parts, and labor work.
