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

ANTI-LOCK BRAKING SYSTEM
Fault finding - Introduction
38C
38C - 2V2 MR-372-J84-38C000$066_eng.mif
138C
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper version.
Type of diagnostic tools
–CLIP
Special tooling required
3. RECAP
Procedure
To perform fault finding on the vehicle's computers, switch on the ignition in fault finding mode.
Proceed as follows:
–vehicle's card in reader;
–press and hold the Start button (longer than 5 seconds) with start-up conditions not present,
–connect the diagnostic tool and perform the required operations.
To cut off + after ignition feed, proceed as follows:
–disconnect the diagnostic tool,
–press the Start button twice briefly (less than 3 seconds),
–Ensure that the + after ignition feed has been cut off by checking that the computer indicator lights on the instrument
panel have gone out. Vehicle(s): Mégane II, Scénic II
Function concerned: ABSName of computer: BOSCH ABS 8.0
Vdiag No: 0C, 0D, 0E, 0F
Special tooling required
Multimeter
Elé. 1681Universal bornier
Note:
The left and right-hand discharge bulb computers are supplied when the dipped headlights are lit. Therefore fault
finding can only be carried out on them after the ignition has been switched on in fault finding mode (forced + after
ignition feed) and the dipped headlights have been switched on.
ABS8.0_V0C_PRELI /ABS8.0_V0D_PRELI /ABS8.0_V0E_PRELI/ABS8.0_V0F_PRELI ABS 8.0X84 4.0
MR-372-J84-38C000$066_eng.mif

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 - Configurations and programming38C
38C - 10V2 MR-372-J84-38C000$264_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - Configurations and programming
Settings
VP001: Write VIN.
This command allows the vehicle identification number to be entered into the computer. Use this
command each time the computer is replaced. The VIN number (VF...) can be found on the
manufacturer's plate on the front right-hand door pillar and on the body panel under the left-hand side
of the windscreen.
VP004: Vehicle parameters.
This command is used to configure the engine type + braking definition + body type.
Select command VP004 on the diagnostic tool (it is imperative to check that the variants selected
correspond to the vehicle type).
VP006: Write date of the last After-Sales service.
Whenever the ABS system is worked on in the shop, the date must be entered.
Select command VP006 on the diagnostic tool.
Enter the operation date with the tool keyboard.
VP007: Tachometric index.
This command is used to program the computer memory with the index required to calculate vehicle
speed from the speed at which the wheels turn.
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 number has been entered using the VP007 command, delete the fault in the computer memory
and then switch off the ignition. Use the parameter PR030 to check that the index entered has been
stored correctly.
VP032: Vehicle speed at initialisation.
Vehicle speed transmitted via the multiplex network when the computer is initialised.
Select "Type 1" or "Type 2" according to the information supplied by the tool.
ABS 8.0X84 4.0
MR-372-J84-38C000$264_eng.mif

ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault summary table38C
38C - 11V2 MR-372-J84-38C000$330_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - Fault summary table
Tool fault Associated DTC Diagnostic tool title
DF001 50CCComputer supply
DF006 501FFront left-hand wheel speed sensor circuit
DF007 503FRear left-hand wheel speed sensor circuit
DF017 50C3Computer
DF020 50C3Tachometric index programming
DF026 500FFront right-hand wheel speed sensor circuit
DF027 502FRear right-hand wheel speed sensor circuit
DF055 50C3Vehicle parameter programming
DF063 5046Wheel speed inconsistency
DF066 5180No injection multiplex signal
DF090 5041Front right-hand wheel target
DF091 5042Front left-hand wheel target
DF092 5043Rear right-hand wheel target
DF093 5044Rear left-hand wheel target
DF152 50E6Multiplex network
DF153 50C3Multiplex network
DF186 5182No instrument panel multiplex signal
DF188 50C6Brake switch circuit
DF193 5180Invalid injection multiplex signals
ABS 8.0X84 4.0
MR-372-J84-38C000$330_eng.mif

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 - 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 - 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 - 63V2 MR-372-J84-38C000$924_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ABS8.0_V0C_ALP13 /ABS8.0_V0D_ALP13/ABS8.0_V0E_ALP13/ABS8.0_V0F_ALP13
ALP 13Intermittent 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 computer
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
Check the condition and connection of the
battery terminals.
Is the battery in good condition?
YES
Check the 50A power fuse in position 5 on
the power fuse board. Check fuse F13 (25A)
on the UPC and the correct locking of the
grey 4-track PPH1 connector (Vdiag 44) or
the 25A fuse F8 on the UPC and the correct
locking of the black 6-track CM connector
(Vdiag 48 or higher).
Are the fuses and connectors correct?
YES
Check the connection and condition of the tab
1 red wire of the grey connector.
Is the connector correct?
YES
NOClean the battery terminals.
NOIf the connector is faulty and there is a repair
procedure (see Technical Note 6015A,
Electrical wiring repair, Wiring: Precautions
for repair), repair the connector, otherwise
replace the wiring.
Replace any faulty fuses. Switch on the ignition
again.
Is the replaced fuse or fuses correct?
NO
Check the insulation to earth between:
–fuse 50A and track 2 of the computer
–fuse 25A and track 3 of the computer
Are the connections correct?
NO YES
Contact the Techline.
If the connection(s) are faulty and there is a repair method
(see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring, otherwise
replace it.
NO
If the connector is faulty and there is a repair method (see Technical
Note 6015A, Repairing electrical wiring, Wiring: Precautions for repair),
repair the connector, otherwise replace the wiring.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.