warning RENAULT SCENIC 2007 J84 / 2.G Anti Lock Braking System Bosch 8.0 ABS Workshop Manual

ANTI-LOCK BRAKING SYSTEM
Fault finding - System operation
38C
38C - 7V2 MR-372-J84-38C000$132_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - System operation
The main functions of ABS on this vehicle are the electronic balancing of front and rear braking by controlling rear
wheel slip and preventing the brakes from locking by controlling the slipping of all four wheels.
The system also supplies the other computers with information on the vehicle speed via a wire connection for the
discharge bulbs, the radio and the electric sunroof, and via the multiplex network for the other computers. The ABS
computer supplies the multiplex network with the odometry for the instrument panel and navigation system. If heavy
braking produces very rapid deceleration, the ABS computer sends out a request to the UCH via the multiplex network
to ask it to switch on the hazard warning lights (depending on the law in the relevant country).
Fault finding warning light illumination strategy for Mégane II ph1 and Scénic II ph 1
Instrument panel warning lightInstrument panel message
Meaning
MEGANE II SCENIC II
Brake faultsABS SERVICE STOPNo message"Brake
fault"Electronic brake
distribution and ABS
functions inoperative.
ABS SERVICENo messageCheck the
ABSABS function
inoperative.
Brake faults
flashing at
2 HzABS flashing
at 2 HzNo messageNo
messageABS computer is in
fault finding mode.
ABS flashing
at 8 HzNo messageNo
messageTachometric index not
programmed.
NOTE:
The STOP warning light is always accompanied by a single audible warning (1 beep).
ABS 8.0X84 4.0
MR-372-J84-38C000$132_eng.mif

ANTI-LOCK BRAKING SYSTEM
Fault finding - System operation
38C
38C - 8V2 MR-372-J84-38C000$132_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
Fault finding warning light illumination strategy for Mégane II ph 2 and Scénic II ph 2
Instrument panel warning lightInstrument panel message
Meaning
MEGANE II
PH2SCENIC II
PH2
Brake faultsABS SERVICE STOPBraking faultElectronic brake
distribution and ABS
functions inoperative.
ABS SERVICECheck ABSABS function
inoperative.
Brake faults
flashing at
2 HzABS flashing
at 2 HzNo messageABS computer is in
fault finding mode.
ABS flashing
at 8 HzNo messageTachometric index not
programmed.
Vehicle speed at
initialisation not
programmed.
Tachometric index and
vehicle speed at
initialisation not
programmed.
Brake faultsABS flashing
at 8 HzSTOPNo messageVehicle parameters not
programmed.
Vehicle parameters
and tachometric index
not programmed.
Vehicle parameters
and vehicle speed at
initialisation not
programmed.
Vehicle parameters
and tachometric index
and vehicle speed at
initialisation not
programmed.
NOTE:
The STOP warning light is always accompanied by a single audible warning (1 beep).
ABS 8.0X84 4.0

ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
38C
38C - 21V2 MR-372-J84-38C000$396_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
DF017
PRESENT
OR
STOREDCOMPUTER
1.DEF : Feed fault or internal electronic fault
2.DEF : Programming / initialisation invalid
NOTESSpecial notes:
The voltage displayed in the parameter (PR005) is the + after ignition feed voltage of
the computer and not the hydraulic unit power feed.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present following a road test at a speed of > 36 mph (60 km/h).
Check the connections and the condition of the battery terminals.
Check the condition and position of the ABS fuses in the engine fuse and relay box.
Check the 50A power fuse in position 5 on the power fuse board.
Check the 25A fuse F13 on the UPC and the correct locking of the grey 4-track PPHI connector (Vdiag 44) or
test the 25A fuse F8 on the UPC and the correct locking of the black 6-track CM connector (Vdiag 48).
Check the connection and condition of the tab 1 red wire of the grey connector.
Check the connections on the 26-track connector of the ABS computer.
Check the ABS earths on tracks 1 and 4 (attached under the ABS unit) and carry out an inspection of the entire
ABS wiring.
Check the continuity between the fuses and tracks 2 and 3 of the computer connector (+ Before ignition present
on the tracks) and between the UCH and track 18 of the computer (+ After ignition present on the track).
Clear the computer fault memory. Switch off the ignition.
Switch on the ignition again and carry out another check using the diagnostic tool.
If the fault is still present, contact the Techline.
2.DEF
NOTESSpecial notes:
No programming for PR020 Vehicle speed at initialisation.
ABS warning light flashing at 8 Hz outside fault finding
conditions.
Run command VP032 and select "Type 1" or "Type 2" according to the information supplied by the diagnostic tool.
Clear the computer fault memory, switch the ignition off and carry out a road test. If the fault is still present, contact
the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_DF017 /ABS8.0_V0D_DF017/ABS8.0_V0E_DF017/ABS8.0_V0F_DF017 ABS 8.0X84 4.0

ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
38C
38C - 22V2 MR-372-J84-38C000$396_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
DF020
PRESENT
TACHOMETRIC INDEX PROGRAMMING
NOTESSpecial notes:
ABS warning light flashing at 8 Hz outside fault finding conditions.
The BOSCH ABS 8.0 computer supplies the vehicle speed signal to all vehicle systems that use this information
(instrument panel, engine management, etc.).
This vehicle speed signal replaces the one supplied by the speed sensor located on the gearbox. The ABS
computer calculates the vehicle speed from the speed of the wheels and the circumference of the tyres fitted on
the vehicle.
Note:
The vehicle speed is sent by wire (track 23) to the xenon bulb computer, radio and electric sunroof, and via the
multiplex network to the other computers.
The tyre circumference must be programmed into the memory of a new computer. This consists of
entering a number X using the VP007 "Tachometric index" command on the diagnostic tool.
Once the index has been entered using the VP007 command, clear the computer fault memory and then switch
off the ignition.
Use the parameter PR030 to check that the index entered has been stored correctly.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_DF020 /ABS8.0_V0D_DF020/ABS8.0_V0E_DF020/ABS8.0_V0F_DF020 ABS 8.0X84 4.0

ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
38C
38C - 31V2 MR-372-J84-38C000$396_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0F
DF055
PRESENT
VEHICLE PARAMETER PROGRAMMING
1.DEF : No vehicle parameter programming
2.DEF : Programming invalid
NOTESSpecial notes:
No programming for PR063 Vehicle parameters.
ABS warning light flashing at 8 Hz outside fault finding conditions.
Read PR063 Vehicle parameters, use command VP004 Vehicle parameters to define the appropriate vehicle
type variant.
It is essential to select the parameters that correspond to the vehicle undergoing fault finding.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0F_DF055ABS 8.0X84 4.0

ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
38C
38C - 40V2 MR-372-J84-38C000$396_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
DF186
PRESENT
OR
STOREDNO INSTRUMENT PANEL MULTIPLEX SIGNAL
NOTESSpecial notes:
Even though it is stored in the computer, this fault does not cause the warning lights to
come on or a fault message. Using the diagnostic tool, run fault finding on the
instrument panel.
Note:
Once the fault in the instrument panel system has been repaired, clear the ABS
computer fault memory.
The multiplex signal from the instrument panel is sent to the ABS via the Protection and
Switching Unit.
Priorities when dealing with a number of faults:
Deal with faults DF152 and DF153 first, whether they are present or stored.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present when the engine is started up.
Check the condition and correct locking of the blue PEH connector on the UPC (Vdiag 44) or the grey CT1
connector of the UPC (Vdiag 48).
Carry out a multiplex network test.
If the fault is still present, perform fault finding on the instrument panel and repair accordingly.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_DF186 /ABS8.0_V0D_DF186/ABS8.0_V0E_DF186/ABS8.0_V0F_DF186 ABS 8.0X84 4.0

ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
38C
38C - 41V2 MR-372-J84-38C000$396_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
DF188
PRESENT
OR
STOREDBRAKE LIGHT SWITCH CIRCUIT
NOTESSpecial notes:
This fault does not cause illumination of any warning lights, nor does it generate any
fault message.
Conditions for applying the fault finding procedure to stored faults:
Clear the stored fault, carry out a road test at a speed of > 37 mph (60 km/h) and test
the brakes using ABS.
Check the conformity of the brake light bulbs.
Using the diagnostic tool, check on the statuses screen that ET017 Brake pedal displays the pressed and released
positions of the brake pedal correctly.
If the correct pedal position is not displayed, use the interpretation of ET017.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_DF188 /ABS8.0_V0D_DF188/ABS8.0_V0E_DF188/ABS8.0_V0F_DF188 ABS 8.0X84 4.0

ANTI-LOCK BRAKING SYSTEM
Fault finding - Dealing with commands
38C
38C - 48V2 MR-372-J84-38C000$792_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - Dealing with commands
CLEARING
RZ001:Fault memory.
This command is used for clearing the computer's stored faults.
ACTIVATION
AC003:
AC004:
AC005:
AC006:Front left-hand wheel solenoid valves.
Front right-hand wheel solenoid valves.
Rear left-hand wheel solenoid valves.
Rear right-hand wheel solenoid valves.
These commands permit a check on the hydraulics of each wheel.
Position the vehicle on a 2-post lift so that the free rotation of the wheels can be checked.
Keep the brake pedal depressed enough to prevent the wheel being tested from being turned by hand (do not brake
so hard that the anti-lock function operates).
Select and confirm the command for the wheel in question (e.g. Left-hand front wheel solenoid valve, etc.).
Turn the wheel concerned by hand: 5 braking/releasing cycles should be detected.
AC013:Wheel speed sensor supply test.
This command is used to check that voltage pulses of approximately 12 V are detected on the faulty
sensor by a multimeter at the terminals of the sensor connector on the computer side.
You must use command AC013 once only.
AC016:Pump motor test.
This command is used to test the pump motor control circuit.
Select command AC016 Pump Motor Test.
The motor must run for 5 seconds.
AC195:Vehicle speed signal.
This command serves to generate a speed other than 0 mph at the computer's vehicle speed wire output
(Track 23) for users of that signal (xenon bulbs, radio, sunroof).
Note:
This command has no visible effect on the dashboard speedometer needle.
–Xenon headlights: Switch on the dipped headlights and run command AC195. Check for slight
variation in the height of the headlight beam while the command is running (the height of the beam is
adjusted to improve visibility according to vehicle speed).
–Radio: Turn on the radio and make sure that the Adjust volume as a function of speed function is
active. Run command AC195. Check that the volume of the sound increases and then decreases
while the command is running.
–Sunroof: This command has no visible effect on the sunroof. This command changes the activation
threshold of the anti-pinch system (the pressure exerted by the sunroof varies with vehicle speed due
to aerodynamic factors).
AC196:Request to switch on hazard warning lights.
This command sends the UCH a request to switch on the hazard warning lights to test their operation
during emergency braking (depending on UCH configuration).
ABS 8.0X84 4.0
MR-372-J84-38C000$792_eng.mif

ANTI-LOCK BRAKING SYSTEM
Fault finding - Customer complaints
38C
38C - 50V2 MR-372-J84-38C000$858_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - Customer complaints
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
FAULTS DETECTED ON BRAKING WITH ABS/BRAKING REGULATION
LOCKING OF ONE OR MORE WHEELS ALP2
PULLINGALP3
DRIFTALP4
UNEXPECTED ABS OPERATION AT LOW SPEEDS AND SLIGHT PEDAL
PRESSUREALP5
UNEXPECTED ABS OPERATION ON A POOR ROAD SURFACE ALP6
UNEXPECTED ABS OPERATION WHEN USING SPECIAL EQUIPMENT (RADIO
TELEPHONE, CB, etc.)ALP7
LENGTHENING OF BRAKE PEDAL TRAVEL FOLLOWING A REGULATION
PHASE (WITH PEDAL RECEDING WHEN ENTERING THE REGULATION
PHASE)ALP8
SPONGY PEDAL ALP9
BRAKE PEDAL VIBRATION ALP10
NOISES FROM THE PUMP, PIPES OR HYDRAULIC UNIT ALP11
OTHER CASES
NO DIALOGUE WITH THE ABS COMPUTER ALP1
"ABS COMPUTER NOT DETECTED" DURING MULTIPLEX NETWORK TEST
ON CLIPALP12
INTERMITTENT ILLUMINATION OF THE BRAKE, ABS, SERVICE AND STOP
FAULT WARNING LIGHTS AND THE MESSAGE “BRAKE FAILURE” ON THE
INSTRUMENT PANEL WITH NO FAULT CODES IN THE COMPUTERALP13
ABS 8.0X84 4.0
MR-372-J84-38C000$858_eng.mif

ANTI-LOCK BRAKING SYSTEM
Diagnostic - Fault finding chart
38C
38C - 53V2 MR-372-J84-38C000$924_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ALP3 Pull
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Disconnect one wheel speed sensor. Start the
engine and ensure that only the ABS fault warning
light comes on. Do not drive the vehicle if the brake
fault warning light is also lit, as the brake limiter
function is no longer guaranteed to operate correctly.
Carry out a road test with the ABS thus out of order.
Is the fault still present under these conditions?
NO
Raise the vehicle so that you can rotate the wheels
and check:
Possible inversion when connecting the speed
sensors.
Possible inversion of pipes on the hydraulic unit.
To perform these tests, refer to and apply the
procedures defined in ALP2. Check the condition
and conformity of the ABS targets. Also check the
sensor/target air gap by rotating each front and rear
wheel one revolution. If the fault is still present,
contact the Techline.
YESIf the brake pedal travel is relatively long,
bleed the brake circuit. If the travel is
normal, check the tyre pressures, the
front axle, or for any leaks in the circuit.
AFTER REPAIRClear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_ALP03 /ABS8.0_V0D_ALP03/ABS8.0_V0E_ALP03/ABS8.0_V0F_ALP03 ABS 8.0X84 3.0