I have a '03 MR2 with 27,000 mi. I'm getting error codes P0860 and P1646.

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The car starts and runs, but will not go into gear. It runs for about 10 seconds and dies before flashing several lights, including the N – neutral light and the Gear light. The HPU runs for about 17 seconds upon opening the door and then shuts off. When the key is at the ON position, the HPU switches on and off several times with the clutch solenoid engaging and disengaging in between. Then it finally stops. I have inspected the SMT fluid and there appears to be no metal that I can see, but I did replace it anyway. I also replaced the battery. It is brand new. I checked the door switch and it works link it should. I have a read out of the diagnostic codes from the TCU. They are: P0900 – Clutch solenoid circuit P0934 – Accumulator pressure sensor/Low voltage P2716 – Pressure solenoid I tested the HPU relay and it is fine. I also switched the shift stroke sensor and the clutch stroke sensor, but the codes were the same when checked again. Any help would be appreciated!