Drive Range, First Gear. Chevrolet Spark 2005

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2005 🢒 Spark 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Jatco 🢒 Drive Range, First Gear

Table 1:	Operation Clutch
Table 2:	Input and Out
Table 3:	Rotating Conditions Of The Gear And Carrier

Operation Clutch

Low clutch	Engages the rear internal gear with the front carrier
Low and reverse brake	Locks the front carrier

Input and Out

Input	Rear sun gear
Output	Rear carrier

Rotating Conditions Of The Gear And Carrier

--	Gear	Front	Rear
Input rotation n _s RPM	Internal Gear	Rotates Clockwise (N _i RPM)	Locked (Stationary)
Output rotation: n _c RPM	Carrier	Locked (Stationary)	Rotates Clockwise (n _c RPM)
n _s is greater than n _c	Sun Gear	Rotates Counterclockwise (N _s RPM)	Rotates Clockwise (n _s RPM)
n _s is greater than n _c indicates that output rotation has been reduced compared to input rotation. Engine brake occurs because the low clutch and the low and reverse brake are engaged.

The operational clutch, input and output, and rotating conditions of each gear and carrier are almost the same as those in the "L" range. However, since the low and reverse brake is not operating, the rear internal gear is locked only against counterclockwise rotation by the 1-way clutch, and can rotate clockwise.

Even if engine brake is desirable, the rear internal gear is allowed to rotate clockwise. Therefore engine brake does not occur.


(1)	Input Shaft (Rear Sun Gear)
(2)	Low and Reverse Brake
(3)	Low Clutch
(4)	1-Way Clutch
(5)	Front Carrier
(6)	Front Sun Gear
(7)	Front Internal Gear
(8)	Rear Carrier
(9)	Rear Internal Gear

1st Gear ("L" Range)

Pilot Pressure

Since shift solenoid valves A and B are ON, pilot pressure operates the shift valve A and B. Since the manual valve is positioned for "L" range, oil pressure which has passed through shift valves A and B is applied tot he low and reverse brake. Therefore, line pressure passes through the manual valve and shift valves A and B, and then operates the low clutch and the low and reverse brake. Since the low and reverse brake is operated, engine brake occurs when the accelerator pedal is released.

1st gear ("D" and "2" ranges)

Pilot Pressure

Since shift solenoid valves A and B are ON, pilot, pressure operates shift valves A and B. Therefore, line pressure passes through the manual valve and shift, valves A and B, and then operates the low clutch. Unlike in the case of "L" range, the low and reverse brake does not operate and the rear internal gear engaged to the front carrier by the low clutch is locked only against counterclockwise rotation by the low 1-way clutch; however, it can rotate clockwise. Therefore, engine brake does not occur when the accelerator pedal is released.