Here is what the service manual says about the EPC solenoid, the processor looks at allot of different inputs to command the solenoids, such as Throttle Position Sensor, Vehicle Speed Sensors, Transmission Range Sensor and RPM signal, The PCM controls the shift patterns for the transmission. Electronic Pressure Control (EPC) Solenoid
The electronic pressure control (EPC) solenoid is located on the main control valve body and is controlled by the PCM. The EPC controls line pressure used to apply and release clutches and bands in the transmission.
The 2-3 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 2-3 shift solenoid activates the 2-3 shift valve which controls the automatic shifting between second and third gear. Second gear is established when the 2-3 shift solenoid is switched on. The 2-3 shift solenoid is switched off when vehicle speed increases and requires a second to third gear upshift.
The 3-4 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 3-4 shift solenoid activates the 3-4 shift valve which controls the automatic shifting between third and fourth gear. Third gear is established when the 3-4 solenoid is switched off. The 3-4 shift solenoid is switched on when vehicle speed increases and requires a third to fourth gear upshift.
SOURCE: 2000 ISUZU TROOPER WITH AUTO TRANSMISSION. CHECK
If the fluid is up -
it could be a vacume loss or the shifting module..
The shifting module is what tells it to shift - and it is controled by vacume pressure..
SOURCE: 06 Corolla Pressure Control Solenoid D Electrical Fault
There is a technical service bulletin to correct this condition. Replacement of the car's Electronic Control Unit (the computer) will cure this. Take it to a Toyota dealer and have them replace it for free.
SOURCE: Pressure Control Solenoid D electrical fault (P2716)
There is a Bulletin on this concern, and it is a warrantable condition for 8 years or 80,000 miles so you are still covered by the factory warranty.
The problem is a logic issue in the PCM. The correction is a new PCM with updated software.
Reference bulletin #TC015-07
The contents are below:
TRANSMISSION & CLUTCH
TC015-07
Title:
HARSH SHIFT AND M.I.L. "ON"
DTC P2716
Models:
'05 - '07 Corolla & Matrix (1ZZ-FE)
September 20, 2007
Introduction
Some 2005 - 2007 model year Corolla and Matrix vehicles equipped with
an automatic transaxle may exhibit a harsh shift condition and a M.l.L.
ON" with DTC P2716 stored.
Improvements have been made to the Engine Control Module (ECM) (SAE term:
Powertrain Control Module/PCM) to reduce the possibility of this condition occurring.
Applicable Vehicles
^
2005 - 2007 model year Corolla and Matrix (2WD) vehicles equipped with the 1ZZ-FE engine.
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Federal Emissions Warranty.
This warranty is in effect for 96 months or 80,000 miles, whichever
occurs first, from the vehicle's in-service date.
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SOURCE: trouble with the transmission solenoid
USUALLY A SHIFT SOLENOID DTC IS REPAIRED BY REPLACING THE TRANS SOLENOID PACK ASSEMBLY..LOCATED ON OUTSIDE OF TRANSMISSION..YOU MUST BE CAREFUL WHEN CHANGING PACK..CLEAN ALL DIRT/DEBRIS FROM OUTSIDE OF PACK..YOU DON'T WANT ANY DIRT TO ENTER TRANSMISSION..SOLENOID IS A SMALL BOX LOCATED ON SIDE OF TRANS FACING FRONT OF VEHICLE..YOU MUST REMOVE TRANS COOLER LINE HOSES FROM FITTINGS ON TRANS..REMOVE INPUT SPEED SENSOR..UNPLUG PACK..8MM SCREW HOLDS IT..3 BOLTS HOLD PACK TO TRANS..YOU MUST CLEAN ALL GASKET RESIDUE THOROUGHLY BEFORE INSTALLING PACK..I'D RECOMMEND GETTING SOMEONE WHO HAS DONE THIS BEFORE IF YOU ARE NOT COMFORTABLE DOING THIS..I HOPE THIS HELPS
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