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Home >> Honda >> 2021 >> Accord Touring >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - Service, Testing And Troubleshooting (Except Hybrid) >> Description And Operation >> A/T System Description - System Diagram (A/T)

A/T System Description - System Diagram (A/T)

For locations of each component on the vehicle, refer to Component Location Index.

Electronic Control 

GHH389457Courtesy of HONDA, U.S.A., INC.

Hydraulic Control 

Circuit Diagram 

GHH389458Courtesy of HONDA, U.S.A., INC.
: Shift Solenoid Valve A : Transmission Fluid Pressure Switch
: Shift Solenoid Valve B : Parking Actuator Valve Stroke Sensor
: Shift Solenoid Valve C : Two-Way Clutch Actuator Valve Stroke Sensor
: Shift Solenoid Valve D : ATF Temperature Sensor
: Shift Solenoid Valve E : Main Regulator Valve
: Shift Solenoid Valve F : Lubrication Regulator Valve
: Shift Solenoid Valve G : Torque Converter Regulator Valve
: Clutch Pressure Control Solenoid Valve A : PL Accumulator Valve
: Clutch Pressure Control Solenoid Valve B : B1 Cut Valve
: Clutch Pressure Control Solenoid Valve C : SD Cut Valve
: Clutch Pressure Control Solenoid Valve D : SF Cut Valve
: Clutch Pressure Control Solenoid Valve E : Parking Actuator Valve
: Clutch Pressure Control Solenoid Valve F : Parking Inhibitor Valve
: Clutch Pressure Control Solenoid Valve G : Parking Ball Valve
: Clutch Pressure Control Solenoid Valve H : Two-Way Clutch Actuator Valve
: Transmission Fluid Pressure Sensor A : Lock-Up Shift Valve
: Transmission Fluid Pressure Sensor B : Lock-Up Control Valve
: Transmission Fluid Pressure Sensor C : Idle Stop Ball Valve
: Transmission Fluid Pressure Sensor D : Accumulator Relief Valve
: Transmission Fluid Pressure Sensor E : Accumulator
: Transmission Fluid Pressure Sensor F : Reducer

Operation Chart 

Position/Mode Clutch Pressure Control Solenoid Valve Operation Shift Solenoid Valve Operation
A B C D E F G H A B C D E F G
P x x/o x x x x x x o/x o/x x o x o x
R o/x o x x x o x x o o x x o x x
N x x/o x x x x x x o/x o/x o o o x x
D Low o/x x x x x o o o/x x x o/x x o x x
2nd o/x x o x x o o o/x x x o/x x o x x
3rd o/x o x x x o o o/x x x o/x x o x x
4th o/x o o x x x o o/x x x o/x x o x x
5th-A o/x o x o x x o o/x x x o/x x o x x
5th-B* o/x x o o x x o o/x x x o/x x o x x
6th o/x o o o x x x o/x x x o/x x o x x
7th o/x o x o x o x o/x x x o/x x o x x
8th o/x x o o x o x o/x x x o/x x o x x
9th o/x x x o o o x o/x x x o/x x o x x
10th o/x x o o o x x o/x x x o/x x o x x

o: Operatedx: Not operated

*: Select from 6th only