2009 RENAULT SCENIC Automatic Transmission AJ0 BVA Workshop Manual

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 9V3 MR-372-J84-23A000$135.mif
AJ0 BVA
Vdiag No.: 04, 05AUTOMATIC TRANSMISSION
Fault finding - Role of components
Role of main automatic transmission components
Automatic transmission computer:
The gearbox computer is used to manage the entire system.
Its role is to define the optimum operating mode for the automatic transmission (modify the torque transmitted to the
drive wheels by the automatic transmission), inform the driver (instrument panel, information display, buzzer) and
communicate with the other computers.
To carry out this function, the transmission computer takes account of:
–the operation of the gearbox,
–signals exchanged with other computers,
–driver requests.
Transmission oil temperature sensor:
Its role is to inform the automatic transmission computer of the transmission oil temperature.
Transmission input speed sensor:
Its role is to inform the automatic transmission computer of the turbine speed.
Transmission output speed sensor:
Its role is to inform the automatic transmission computer of the vehicle speed.
Brake light switch:
Its role is to inform the automatic transmission computer that the driver has depressed the brake pedal.
Multifunction switch:
Its role is to inform the automatic transmission computer of the gear lever position.
Shift-lock:
The role of this function is to lock the lever in position "P" and to immobilise the vehicle when stationary.
Solenoid valves:
The solenoid valves are fitted in the factory and cannot be removed from the hydraulic distributor to ensure optimum
gearbox operation, therefore they cannot be replaced separately.
The automatic transmission has two types of solenoid valve:
–2 "all or nothing" solenoid valves,
–6 "progressive" solenoid valves.
Of these 8 solenoid valves, 7 are used to control gear changes in automatic and manual modes, and one solenoid
valve controls the oil pressure in the automatic transmission hydraulic distributor.
Instrument panel display:
The purpose of this function is to manage the transmission of multiplex line signals required for the instrument panel
display.
On the instrument panel:
–a fault warning light,
–a message on the instrument panel in case of irregularity,
–an information display: gear lever position/gear engaged/brake pedal depressed indicator light/lever position in P
or N request indicator light.
On the gear lever:
–Position: P / R / N / D / M+/-,
–Shift-lock: lever lock.
MR-372-J84-23A000$135.mif

AUTOMATIC TRANSMISSION
Fault finding - Operating diagram
23A
23A - 10V3 MR-372-J84-23A000$180.mif
AJ0 BVA
Vdiag No.: 04, 05AUTOMATIC TRANSMISSION
Fault finding - Operating diagram
Line pressure
OIL PUMP
Hydraulic
distributor
Primary regulation valve (pressure regulating valve)
LS pressure regulation solenoid valve
Manual valve
Clutch
modulating
solenoid valve 1
Clutch
modulating
solenoid valve 2Clutch
modulating
solenoid valve 3Brake
modulating
solenoid valve 2Modulating solenoid
valve
lock-up/brake 1
Sequence
solenoid valve 1Sequence solenoid
valve 2
Clutch 1 Clutch 2 Clutch 3 Brake 2Brake
1Torque
converter
lock-up
Hydraulic receivers
MR-372-J84-23A000$180.mif

AUTOMATIC TRANSMISSION
Fault finding - Operating diagram
23A
23A - 11V3 MR-372-J84-23A000$180.mif
AJ0 BVA
Vdiag No.: 04, 05
Hydraulic distributor
Clutch modulating
solenoid
valve 1Clutch modulating
solenoid
valve 2Clutch modulating
solenoid
valve 3Brake modulating
solenoid
valve 2Modulating solenoid
valve, lock-up/brake 1
Sequence
solenoid valve 1Sequence solenoid valve 2
Clutch 1
pressure switchClutch 2
pressure switchClutch 3
pressure switchBrake pressure
switch 2Brake pressure
switch 1
Clutch 1 Clutch 2 Clutch 3 Brake 2 Brake 1Torque
converter
lock-up
Hydraulic receivers
Line pressure

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 12V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05AUTOMATIC TRANSMISSION
Fault finding - Role of components
The automatic transmission computer performs the following functions:
–Transmission operating mode selection:
According to the vehicle speed and the driver's request expressed by the accelerator pedal position, the automatic
transmission determines the best moment for the gear change. The automatic transmission computer corrects any
driver errors and inhibits engagement of a gear that would cause the engine to over- or under-rev.
–Gear changes:
Taking into account the various input factors, the computer will decide whether to actuate the various solenoid valves
to ensure smooth system operation (automatic transmission clutches, brakes and hydraulics).
The computer is also involved in:
–the gear change quality,
–protecting the automatic transmission in the event of a malfunction.
–Disengaging clutch when stopped:
This function enables creep* to be inhibited temporarily when the vehicle is stationary with a gear engaged and the
brake pedal depressed.
The aim of this function is to reduce drag on the vehicle in order to:
●reduce fuel consumption,
●reduce vehicle vibrations,
Creep*: describes the action of the vehicle moving forwards without acceleration and with a gear engaged.
MR-372-J84-23A000$225.mif

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 13V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05
"Automatic transmission management" FUNCTION:
Purpose of this function:
This function enables the automatic transmission computer to define the gear change programs.
Position of multifunction switch and its associated tracks on the computer:Multifunction switch:
Internal switches
(see table below)
"Automatic
transmission
management"
function:Modes: automatic or
manual
Oil temperature
sensor: Oil
temperatureGear upshifts or
downshifts in
manual position
Shift pattern control
(on lever)
M+, M-Gear lever position:
P, R, N, D
Position
TrackPRND
2
1
3
4
56

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 14V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05
"GEAR CHANGE" FUNCTION:
Purpose of this function:
The purpose of this function is to control gear changes in automatic and manual modes.
"Lever selection"
function
"Gear
change"
functionClutch 1
solenoid valve
Brake pedal action Brake 2 solenoid valve
Vehicle speed Clutch 2 solenoid valve
Turbine speed Clutch 3 solenoid valve
Lock-up and brake 1
solenoid valve
Solenoid valve EVS1
Solenoid valve EVS2
–Accelerator
–Engine speed
–Gear change inhibition
–...CAN
"Torque management"
function

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 15V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05
System operation table:
O = Active
*Cltch = Clutch
*EVS = Shift solenoid
*O: Check (engine running at idle speed and brake pedal depressed), status ET261 "Clutch 1" lever in "D" position:
ET013 "Gear engaged" = "1" →→ → →
status ET261 "Clutch 1" is "active"; if status ET013 "Gear engaged" is
"Disengaged" (disengaging clutch when stationary) → ET261 "Clutch 1" is "inactive".
PRESSURE SWITCHES SOLENOID VALVESSOLENOID
VALVES
(ALL OR NOTHING)
Clutch*
1Brake
2Clutch*
2Clutch*
3Brake
1Clutch*
1Brake
2Clutch*
2Clutch*
3lock-up
and
brake 1*EVS1 *EVS2
PO
ROO O O O
NOO O
fixed 1st
gearOOOOOOO
D1O* O O O O
D2OO OOOO
D2 with
lock-upOO OOOO O
D3OO O O
D3 with
lock-upOO O OO
D4OOOO
D4 with
lock-upOOOOO
D5OO O
D5 with
lock-upOO O O
D6OO OO O
D6 with
lock-upOO OO OO

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 16V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05
"PRESSURE CONTROL" FUNCTION:
Purpose of this function:
The purpose of this function is to regulate the oil pressure inside the transmission hydraulic distributor.
"Lever selection"
function
"Pressure
control"
function Oil temperature
Line pressure solenoid
valve
Vehicle speed
Turbine speed
–Accelerator pedal
position
–Engine speed
–Engine torqueCAN
"Gear change" function