Honda Civic. Manual — part 176

VOLTAGE)

reference
voltage

ignition
switch ON
(II): About 5
0 V

C14

GRN/WHT SG1 (SENSOR

GROUND)

Sensor ground Less than

1.0 V at all
times

C22

WHT/BLK POILCS (ENGINE OIL

PRESSURE (EOP)
SENSOR)

Detects EOP
sensor signal

With
ignition
switch ON
(II). About
0.5 V
With engine
running:
About 0.7 V
(depending
on engine
oil pressure)

C36

BLK/YEL IG1 (IGNITION

SIGNAL)

Detects ignition
switch signal

With
ignition
switch ON
(II): Battery
voltage

C40

BRN/YEL LG1 (LOGIC

GROUND)

Ground circuit
for PCM circuit

Less than
1.0 V at all
times

C43

BLK/BLU NC (OUTPUT SHAFT

(COUNTERSHAFT)
SPEED SENSOR)

Detects output
shaft
(countershaft)
speed sensor
signal

With
ignition
switch ON
(II): About 0
V or about 5
0 V
With vehicle
moving
About 2.5 V

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Hydraulic Controls

The valve body includes the main valve body, the regulator valve body, and the
servo body. The ATF pump is driven by splines on the end of the torque converter
which is attached to the engine. Fluid flows through the regulator valve to maintain
specified pressure through the main valve body to the manual valve, directing
pressure to each of the clutches. Shift solenoid valves A, B, C, and D are mounted
on the servo body. A/T clutch pressure control solenoid valves A, B, and C are
mounted on the transmission housing.

(pulses)

C44

BRN/YEL LG2 (LOGIC

GROUND)

Ground circuit
for PCM circuit

Less than
1.0 V at all
times

NOTE:

Standard battery voltage is about 12 V.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Fig. 33: Identifying A/T Clutch Pressure Control Solenoid Valves Components
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Main Valve Body

The main valve body contains the manual valve, cut valve B, shift valves A, C, and
D, the relief valve, the lock-up control valve, the cooler check valve, the servo
control valve, and the ATF pump gears. The primary function of the main valve
body is to switch fluid pressure on and off to control hydraulic pressure going to the
hydraulic control system.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Fig. 34: Identifying Main Valve Body Components
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Regulator Valve Body

The regulator valve body is located on the main valve body. The regulator valve
body contains the regulator valve, the torque converter check valve, the lock-up
shift valve, the 1st accumulator, and the 3rd accumulator.

Fig. 35: Identifying Regulator Valve Body Components
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Regulator Valve

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)