light RENAULT SCENIC 2007 J84 / 2.G Anti Lock Braking System Bosch 8.0 ABS User Guide

ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of statuses
38C
38C - 46V2 MR-372-J84-38C000$660_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ET017
CONTINUED
Status is "pressed" with brake pedal released.
–Check the condition and fitting of the brake light switch, the brake lights fuse and the conformity of the bulbs.
–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 and ensure insulation against 12 V on the connection between track 1 of the brake switch connector and
track 20 of the computer connector.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
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

ANTI-LOCK BRAKING SYSTEM
Diagnostic - Fault finding chart
38C
38C - 54V2 MR-372-J84-38C000$924_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ALP4 Drift
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
Normal behaviour linked to the system operation
during the regulation phase, mainly on surfaces with
uneven grip or which are poorly laid.
YESRoad holding fault not related to the ABS.
Check the condition of the brake linings
and that they are to specification and
check the tyre pressures, the front axle,
etc.
AFTER REPAIRClear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_ALP04 /ABS8.0_V0D_ALP04/ABS8.0_V0E_ALP04/ABS8.0_V0F_ALP04 ABS 8.0X84 3.0

ANTI-LOCK BRAKING SYSTEM
Diagnostic - Fault finding chart
38C
38C - 55V2 MR-372-J84-38C000$924_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ALP5Unexpected ABS operation at low speeds and slight pedal
pressure
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Warning: the ABS is sensitive on slippery surfaces (ice, wet tiles, etc.).
It is possible to feel brake pedal vibrations which are associated with the reaction of the system in particular
circumstances, such as:
crossing rumble strips,
tight cornering with lifting of the inside rear wheel.
These vibrations may be linked to simple brake limiter activation, when the pressure on the rear axle is limited.
If the fault is different, check the speed sensor connectors (micro-breaks) as well as the air gaps.
AFTER REPAIRClear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS8.0_V0C_ALP05 /ABS8.0_V0D_ALP05/ABS8.0_V0E_ALP05/ABS8.0_V0F_ALP05 ABS 8.0X84 3.0

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.