Page 26 of 57

38C-26
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$090.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
ABS BOSCH 8.1
Vdiag No.: 18
DF027
CONTINUED 1
YES
If pulses are detected, the rear right-hand wheel speed sensor is defective, replace
the sensor.
NOCheck the connection and condition of the connections of the ABS computer,
component code 118.
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.
Check and ensure the continuity of the following connections:
–4S between components 150 and 118,
–4T between components 150 and 118.
Also check the insulation between these two connections.
If the connection or connections are faulty and if there is a repair procedure (see
Technical Note 6015A, Electrical wiring repair, Wiring: Precautions for repair),
repair the wiring, otherwise replace it.
If the fault is still present, contact the Techline.
Page 27 of 57

38C-27
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$090.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
ABS BOSCH 8.1
Vdiag No.: 18
DF027
CONTINUED 2
1.DEFNOTESNone.
Visually inspect the condition of the target and sensor (for dirt, metallic contamination, bearing grease, etc.), and
clean using compressed air if necessary.
If there is a lot of grease on the target, contact the Techline.
Check that the wheel speed sensor mounting is in good condition.
Check the conformity of the target (condition, number of teeth = 48 or 44 depending on the version) with the specific
command SC001 Check target teeth.
If the checks are correct:
– clear the computer fault memory using the command RZ001 Fault memory,
– exit fault finding mode, switch off the ignition and carry out a road test.
Replace the instrumented bearing if the fault recurs.
If the fault is still present, contact the Techline.
Page 28 of 57

38C-28
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$090.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
ABS BOSCH 8.1
Vdiag No.: 18
DF063
PRESENT
OR
STOREDWHEEL SPEED CONSISTENCY
1.DEF: Interference
NOTESPriorities when dealing with a number of faults :
Deal with faults DF006 Front left-hand wheel speed sensor circuit, DF007 Rear left-
hand wheel speed sensor circuit, DF026 Front right-hand wheel speed sensor
circuit and DF027 Rear right-hand wheel speed sensor circuit first even if they are
stored.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present during a road test.
Check the condition of the braking system (condition of linings, sealing, grating, bleed, etc.).
Check the condition of the axles and the conformity and good condition of the tyre mountings.
Check how well the wheel speed sensors are fitted (correct clipping).
Repair if necessary.
If the fault is still present, contact the Techline.
ABS8.1X76_V18_DF063
Page 30 of 57

38C-30V1 MR-376-X76-38C000$100.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Conformity check38C
ABS BOSCH 8.1
Vdiag No.: 18
MAIN SCREEN (CONTINUED)
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool.
FunctionStatus or parameter
checked or actionNotes Fault finding
Front right-hand wheel
speedPR001:Front right-
hand wheel
speedEnsure that the wheel
speed is consistentIn the event of a fault, apply
the interpretation of fault
DF026 Front right-hand
wheel speed sensor circuit
Front left-hand wheel
speedPR002:Front left-
hand wheel
speedEnsure that the wheel
speed is consistentIn the event of a fault, apply
the interpretation of fault
DF006 Front left-hand wheel
speed sensor circuit
Rear right-hand wheel
speedPR003:Rear right-
hand wheel
speedEnsure that the wheel
speed is consistentIn the event of a fault, apply
the interpretation of fault
DF027 Rear right-hand wheel
speed sensor circuit
Rear left-hand wheel
speedPR004:Rear left-hand
wheel speedEnsure that the wheel
speed is consistentIn the event of a fault, apply
the interpretation of fault
DF007 Rear left-hand wheel
speed sensor circuit
Page 31 of 57

38C-31V1 MR-376-X76-38C000$100.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Conformity check38C
ABS BOSCH 8.1
Vdiag No.: 18
BRAKING REGULATION
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool.
FunctionStatus or parameter
checked or actionNotes Fault finding
Front right-hand wheel
solenoid valvesAC004:Front right-
hand wheel
solenoid
valvesThis command is used to
perform a hydraulic
check of the front right-
hand wheel.In the event of a fault, apply the
interpretation of command
AC004.
Front left-hand wheel
solenoid valvesAC003:Front left-hand
wheel
solenoid
valvesThis command is used to
perform a hydraulic
check of the front left-
hand wheel.In the event of a fault, apply the
interpretation of command
AC003.
Rear right-hand wheel
solenoid valvesAC006:Rear right-
hand wheel
solenoid
valvesThis command is used to
perform a hydraulic
check of the rear right-
hand wheel.In the event of a fault, apply the
interpretation of command
AC006.
Rear left-hand wheel
solenoid valvesAC005:Rear left-hand
wheel
solenoid
valvesThis command is used to
perform a hydraulic
check of the rear left-
hand wheel.In the event of a fault, apply the
interpretation of command
AC005.
Pump motor testAC016:Pump motor
testThis command is used to
test the pump motor
control circuit.In the event of a fault, apply the
interpretation of command
AC016.
Wheel speed sensor
supply testAC013:Wheel speed
sensor supply
testThis command allows
testing every wheel
speed sensor supply.In the event of a fault, apply the
interpretation of command
AC013.
Page 37 of 57
38C-37V1 MR-376-X76-38C000$140.mif
38C
ABS BOSCH 8.1
Vdiag No.: 18
Tool
commandDiagnostic tool title Comments
RZ001Fault memory This command is used to clear the faults stored in the computer.
AC003Front left-hand wheel
solenoid valvesSee interpretation of command AC003.
AC004Front right-hand wheel
solenoid valvesSee interpretation of command AC004.
AC005Rear left-hand wheel
solenoid valvesSee interpretation of command AC005.
AC006Rear right-hand wheel
solenoid valvesSee interpretation of command AC006.
AC013Wheel speed sensor supply
testSee interpretation of command AC013.
AC016Pump motor test See interpretation of command AC016.
ANTI-LOCK BRAKING SYSTEM
Fault finding – Command summary table
Page 40 of 57
38C-40
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$150.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of commands38C
ABS BOSCH 8.1
Vdiag No.: 18
AC013WHEEL SPEED SENSOR SUPPLY TEST
NOTESConditions of use of the command:
Ignition on, engine stopped and vehicle speed zero.
Before running the command, check that the battery is properly charged (see 80A,
Battery, Battery: Customer complaints).
You must use command AC013 once only.
This command is used to check that voltage pulses of approximately 12 V are detected on the faulty sensor by a
multimeter on the connector terminals on the computer side, component codes 150, 151, 152, and 153.
Select the command AC013.
Note:
To restart an AC013 command, restart then stop the vehicle engine and ensure that the battery is properly
charged.
ABS8.1X76_V18_AC013
Page 47 of 57

38C-47
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$170.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault Finding Chart38C
ABS BOSCH 8.1
Vdiag No.: 18
ALP2 Locking of one or more wheels
NOTESOnly address this customer complaint after a complete check with the diagnostic
tool.
Reminder:
Locking of the wheels on a vehicle fitted with ABS or squealing of tyres, interpreted by the customer as locking,
could be related to a normal reaction of the system and should not automatically be assumed to be a fault (braking
with ABS regulation on a very bad road causes considerable squealing).
However, if the wheel(s) is/are actually locking, lift the vehicle so that you can turn the wheels and check for:
– Possible inversion when connecting the speed sensors.
Use parameters PR001 Front right-hand wheel speed, PR002 Front left-hand wheel speed, PR003 Rear
right-hand wheel speed and PR004 Rear left-hand wheel speed by turning the relevant wheels and checking
the consistency of the results obtained.
If the value measured is zero, rotate the other wheels to confirm an electrical inversion of the sensors and repair
the wiring harness.
– Possible inversion of pipes on the hydraulic unit.
Use commands AC003 Front left-hand wheel solenoid valves, AC004 Front right-hand wheel solenoid
valves, AC005 Rear left-hand wheel solenoid valves and AC006 Rear right-hand wheel solenoid valves
while depressing the brake pedal and check for the occurrence of locking/unlocking cycles on the wheel
concerned (see Command summary table). If the cycles do not occur on the wheel tested (wheel remains
locked), check whether they occur on another wheel to confirm reversed pipes.
If the cycles do not occur on one wheel and the pipes have not been inverted, contact the Techline.
ABS8.1X76_V18_ALP2