light 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 - Introduction
38C
38C - 5V2 MR-372-J84-38C000$066_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
4. FAULT FINDING PROCEDURE (continued)
Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulators and wiring harness routing.
Look for signs of oxidation.
Tactile inspection
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
Make sure that the connectors are properly locked.
Apply light pressure to the connectors.
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component
Disconnect the connectors and check the appearance of the clips and tabs, as well as the crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Check that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Resistance check
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, to + 12 V or to another wire.
If a fault is detected, repair or replace the wiring harness.
ABS 8.0X84 4.0

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 - Interpretation of statuses
38C
38C - 45V2 MR-372-J84-38C000$660_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0FANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of statuses
ET017
BRAKE PEDAL
NOTESSpecial notes:
Carry out the checks only if the "pressed" and "released" statuses are not
consistent with the pedal position.
STATUS IS "RELEASED" WITH BRAKE PEDAL PRESSED.
If brake lights operate:
–Check the continuity of the connection between track 1 of the brake light switch connector and track 20 of the
computer connector.
If the brake lights do not operate:
–Check the condition and fitting of the brake light switch and brake lights fuse.
–Remove the brake light switch and check that it is operating correctly:
Continuity between tracks Insulation between tracks
Switch pressed
(Brake pedal released)3 and 4 1 and 2
Switch released
(Brake pedal depressed)1 and 2 3 and 4
Replace the switch if necessary.
Check for + after ignition feed on tracks 2 and 4 on the brake light switch connector.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_ET017/ ABS8.0_V0D_ET017/ABS8.0_V0E_ET017/ABS8.0_V0F_ET017 ABS 8.0X84 4.0
MR-372-J84-38C000$660_eng.mif