Neutral Engine On

Neutral Engine On

When the transmission is operating in Neutral (Engine OFF), and the HPCM determines that vehicle operating conditions (low state of battery charge) are appropriate, the internal combustion engine (ICE) is started, the auxiliary fluid pump is turned OFF, and the main fluid pump provides hydraulic fluid pressure (refer to Engine Start Engine Start ). After Engine Start, the following changes would occur to the transmission's hydraulic and electrical systems.

1-3 Reverse Clutch Releases

Pressure Control (PC) Solenoid 4

The PC solenoid 4 is commanded OFF, allowing PCS 4 signal fluid to exhaust from the 1-3 reverse clutch regulator valve.

Shift Solenoid 2

The shift solenoid 2 is commanded OFF, allowing solenoid 2 signal fluid to exhaust. When solenoid 2 signal fluid exhausts, the shift solenoid valve- mode A moves to the released position.

1-3 Reverse Clutch Assembly

13 reverse clutch fluid pressure is exhausted from the 1-3 reverse clutch housing assembly, allowing 1-3 reverse clutch spring force to move the 1-3 reverse clutch piston and release the 1-3 reverse clutch plates.

Shift Solenoid Valve - Mode A

13 reverse clutch fluid pressure exhausts at the shift solenoid valve- mode A.

#3 Ball Check Valve

13 reverse clutch feedback fluid pressure exhausts into the 13 reverse clutch/A cooling feed circuit, allowing actuator feed limit fluid to seat the ball.

1-3 Reverse Clutch Regulator Valve

1-3 reverse clutch regulator valve spring force moves the 1-3 reverse clutch regulator valve to the released position, allowing 13 reverse clutch/A cooling feed fluid pressure to exhaust.

Torque Dampener Clutch Releases

Pressure Control (PC) Solenoid 5

The PC solenoid 5 is de-energized (OFF) allowing PCS 5 signal fluid to exhaust from the dampener bypass clutch valve.

Torque Dampener Clutch Assembly

Dampener clutch fluid exhausts from the torque dampener clutch assembly to the dampener bypass clutch valve allowing the torque dampener clutch to release.

Dampener Bypass Clutch Valve

Dampener bypass clutch valve spring force moves the dampener bypass clutch valve to the released position, allowing dampener clutch fluid pressure to exhaust through the valve into the exhaust backfill circuit.

Transmission Fluid Temperature (TFT) Sensor

Dampener clutch fluid pressure in the exhaust backfill circuit exhausts at the TFT sensor.

Shift Accumulation

1-3 Reverse Clutch Accumulator

13 reverse clutch fluid also exhausts from the 1-3 reverse clutch accumulator assembly. Accumulator spring force moves the 1-3 reverse clutch accumulator piston to the released position.

Neutral Engine On