2009 RENAULT SCENIC engine

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 - 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

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 17V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05
"CONVERTER lock-up" FUNCTION:
Aim of this function: The aim of this function is to lock up the converter.
–lock-up/release definition:
The converter is a hydraulic clutch which provides a hydraulic connection between the engine and the automatic
transmission pressure plate.
The purpose of the lock-up function is to lock the turbine and the converter casing together, transforming a hydraulic
connection into a mechanical connection. The role of the lock-up function is to prevent slipping losses.
EVS2*: sequence solenoid valve 2."Lever selection"
function
"Converter
lock-up"
functionLock-up and brake 1
solenoid valve
Solenoid valve EVS2*
Oil temperature
Vehicle speed
Turbine speed
Brake pedal action
"Torque management"
function
–Accelerator pedal
position
–Engine speed
–Engine torqueCAN
"Gear change" function

AUTOMATIC TRANSMISSION
Fault finding - Role of components
23A
23A - 18V3 MR-372-J84-23A000$225.mif
AJ0 BVA
Vdiag No.: 04, 05
"TORQUE MANAGEMENT" FUNCTION:
Purpose of this function:
The purpose of this function is to manage the torque setpoints during certain gear shifts by informing the injection
computer. This function means smoother gear shifts and better mechanical protection.
–Accelerator pedal
position
–Engine speed
–Engine torqueCAN
"Torque
management"
function Vehicle speed
CAN–Torque request
–Torque converter status
–Gear changes
(in progress)
Turbine speed
"Gear change" function

AUTOMATIC TRANSMISSION
Fault finding - Replacement of components
23A
23A-22V3 MR-372-J84-23A000$270.mif
AJ0 BVA
Vdiag No.: 04, 05
Tool fault Diagnostic tool title Defect modes
DF236Invalid engine speed multiplex signal No defect mode.
DF238Signal: raw engine torque multiplex
signal*If the fault occurs while driving, the gearbox
engages fixed 5
th gear.
Restarting is in 3rd gear.
DF256Erratic gear jumping – If caused by brake 2 solenoid valve, system
switches to fixed 3
rd or 5th gear safe mode.
–If caused by clutch 2 solenoid valve, system
switches to fixed 2
nd or 6th gear safe mode.
–If caused by clutch 3 solenoid valve, system
switches to fixed 2
nd, 3rd or 5th gear safe
mode.
–If caused by clutch 1 solenoid valve, system
switches to fixed 3
rd, 5th or 6th gear safe
mode.
In all cases, restarting is in 3
rd gear.
DF273Clutch 1 solenoid valve circuit If the fault occurs while driving, the
transmission engages fixed 5
th gear.
Restarting in fixed 5th gear (no more gear
changes).
DF274Clutch 2 solenoid valve circuit – in the event of open circuit or short circuit+:
No defect mode.
–in the event of short circuit-:
If the fault occurs while driving, the
transmission engages fixed 5
th gear.
Restarting in fixed 3rd gear (no more gear
changes)
DF275Clutch 3 solenoid valve circuit – in the event of open circuit or short circuit+:
No defect mode.
–in the event of short circuit-:
If the fault occurs while driving, the
transmission engages fixed 5
th gear.
Restarting in fixed 5th gear (no gear change)
DF289Automatic transmission multiplex
signalNo defect mode.
DF290Multiplexed ABS signal No defect mode.
DF298Gear shifts – If caused by brake 2 solenoid valve, system
switches to fixed 6
th gear safe mode.
–If caused by clutch 2 solenoid valve, system
switches to fixed 5
th gear safe mode.
Restarting in 3rd gear.
–If caused by clutch 3 solenoid valve, system
switches to fixed 5
th gear safe mode.

AUTOMATIC TRANSMISSION
Fault finding - Replacement of components
23A
23A-23V3 MR-372-J84-23A000$270.mif
AJ0 BVA
Vdiag No.: 04, 05
Tool fault Diagnostic tool title Defect modes
DF300Brake 2 solenoid valve circuit – in the event of open circuit or short circuit+:
No defect mode.
–in the event of short circuit-:
If the fault occurs while driving, the
transmission engages fixed 5
th gear.
Restarting in fixed 3rd gear (no gear change)
DF301Clutch 1 pressure switch circuit No defect mode.
DF302Clutch 2 pressure switch circuit No defect mode.
DF303Clutch 3 pressure switch circuit No defect mode.
DF304Brake 1 pressure switch circuit No defect mode.
DF305Brake 2 pressure switch circuit No defect mode.
DF306Lock-up/brake 1 solenoid valve circuit Fixed 5
th gear engaged.
Restarting in fixed 3rd gear (no gear change).
DF307Engine braking No defect mode.
DF308Computer earth Fixed 5
th gear engaged.