Page 15 of 101

38C-15V3 MR-413-X44-38C050$070.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
REPLACING THE COMPUTER:
When replacing the computer (see MR 411, Mechanical, 38C, Anti-lock braking system, Braking computer:
Removal - Refitting), use the following procedure:
–Switch off the ignition.
–Replace the computer.
–Enter the VIN number using command VP001 Enter VIN (see Configurations and Programming).
–Configure the tachometric index using command VP007 Tachometric index (see Configurations and
programming).
–Configure the vehicle parameters using command VP004 Vehicle parameters (see Configurations and
programming).
–Inhibit or authorise illumination of the automatic brake lights (depending on the country's legislation) using
command VP021 Inhibit automatic brake lights or VP022 Authorise automatic brake lights.
–Clear the ESP sensor offsets using command RZ011 Sensors offsets (see Configurations and programming).
–Enter the After-Sales date using command VP006 Enter last APV* operation date.
–Perform a road test followed by a fault reading to confirm that the system is operating correctly.
REPLACING THE STEERING WHEEL ANGLE SENSOR:
–Calibrate the steering wheel angle sensor using command VP003 Steering wheel angle sensor (see
Configurations and programming).
–Clear the ESP sensor offsets using command RZ011 Sensor offsets.
REPLACING THE COMBINED SENSOR:
–Clear the ESP sensor offsets using command RZ011 Sensor offsets.
* APV: After-Sales
ANTI-LOCK BRAKING SYSTEM
Fault finding – Replacement of components
Page 16 of 101

38C-16V3 MR-413-X44-38C050$080.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
Parameters:
VP001: Enter 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 (VF...) is engraved on the manufacturer's plate on
the front right-hand door pillar and stamped on the body under the windscreen on the left-hand side.
VP003: Steering wheel angle sensor
This command is used to calibrate the steering wheel angle.
With the steering wheel horizontal and the front wheels set straight ahead, calibrate the steering wheel angle sensor
using command VP003 on the diagnostic tool.
VP004: Vehicle parameters
This command configures the engine type configuration, the braking definition and the body type. Select the
command VP004 on the diagnostic tool.
VP006: Enter last After-Sales operation date
Whenever the ABS system is worked on in the shop, the date must be entered.
Select command VP006 on the diagnostic tool.
Enter the service date using the diagnostic tool keypad.
VP007: Tachometric index
This command is used to program the computer memory with the index required to calculate the vehicle speed
according to the tyre size.
The BOSCH 8.1 ESP computer supplies the vehicle speed signal to all areas where this information is needed
(instrument panel, engine management, etc.). This vehicle speed signal replaces the one supplied by the speed
sensor located on the gearbox.
The ESP computer calculates the vehicle speed from the wheel speed and the tyre circumference.
The tyre circumference must be programmed into the memory of a new computer. This consists of entering an index
"X" using the command VP007 "Tachometric index" 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 parameter PR030 "Tachometric index" to check that the index entered has been
recognised by the system.
VP021: Inhibit automatic brake lights
This command deactivates the automatic brake lights.
Select command VP021 on the diagnostic tool.
VP022: Automatic brake lights authorisation
This command authorises the automatic brake lights.
Select command VP022 on the diagnostic tool.
* APV: After-SalesNote:
The vehicle speed is supplied by a wire (connection 47F) to the radio, to the electric power-assisted
steering, to the electric sunroof and by the multiplex network for the other computers.
ANTI-LOCK BRAKING SYSTEM
Fault finding – Configurations and programming
Page 18 of 101

38C-18V3 MR-413-X44-38C050$090.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault summary table38C
Bosch 8.1 ESP
Vdiag No.: 05
* inj: InjectionTool faultAssociated
DTCDiagnostic tool title
DF100 5158Steering wheel angle multiplex signal absent
DF108 5158Steering wheel angle sensor
DF126 50F4Combined sensor signal plausibility
DF152 50E6Multiplex network
DF153 50C3Multiplex network
DF186 5182No instrument panel multiplex signal
DF187 50CEBrake light activation relay circuit
DF188 50C6Brake light switch circuit
DF189 50F4Combined sensor circuit
DF190 50F4Combined sensor
DF191 50C9ESP on/off button circuit (only on RS version)
DF193 5180Invalid inj.* multiplex signals
DF202 5183Invalid UCH multiplex signals
DF216 5158Steering wheel angle programming offset
DF300 50CAPump motor control circuit
DF311 5188No sequential gearbox multiplex signal (depending on vehicle)
DF313 5188Invalid sequential gearbox multiplex signals (depending on vehicle)
DF321 5180Clutch switch signal consistency
Page 40 of 101
38C-40
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool
If the fault is still present, contact the Techline.
V3 MR-413-X44-38C050$101.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF086
PRESENT
OR
STOREDCOMPUTER CONFIGURATION
DEF: incorrect vehicle configuration
NOTESNone.
Configure the inhibition or authorisation of the automatic brake lights (according to the legislation of the country).
Using command VP021 Automatic brake light inhibition:
Configure the inhibition of the automatic brake lights using command VP021 Automatic brake light inhibition
Using command VP022 Automatic brake light authorisation:
Configure the authorisation of the automatic brake lights using command VP022 Automatic brake light
authorisation.
ESP_V05_DF086
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38C-48
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool
If the fault is still present, contact the Techline.
V3 MR-413-X44-38C050$101.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF098
PRESENT
OR
STOREDNO UCH MULTIPLEX SIGNAL
NOTESSpecial notes:
Even though this is stored in the computer, this fault does not cause the warning lights
to come on or a fault message, because the ESP system is not faulty.
Perform fault finding on the UCH (Passenger compartment connection unit) using
the diagnostic tool.
Note:
After repairing the fault in the UCH (Passenger compartment connection unit),
clear the fault memory in the ESP system.
Priority in the event of a number of faults:
Deal with fault DF152 Multiplex network first if it is present or stored.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present when the engine is started.
Check the UCH (Passenger compartment connection unit) using the diagnostic tool (see 87B, Passenger
compartment connection unit).
Run a multiplex network test (see 88B, Multiplex).
ESP_V05_DF098
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38C-56
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool
If the fault is still present, contact the Techline.
V3 MR-413-X44-38C050$101.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF187
PRESENT
OR
STOREDBRAKE LIGHT ACTIVATION RELAY CIRCUIT
DEF: open circuit or short circuit
NOTESSpecial notes:
If this fault appears after running command AC187 Brake light activation relay,
ignore this fault.
Use the Wiring Diagram Technical Note for New Twingo.
Are the brake lights continuously lit?
YESConnector of components 1281, 1094 and intermediate union R107 disconnected,
Check the insulation to earth of connection 4GJ between component 1281
and intermediate union R107.
Check the insulation to earth of connection 4GJ between intermediate union R107
and component 1094.
If the connections are faulty (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If all these checks are in order, replace component 1281.
ESP_V05_DF187
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38C-57
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool
If the fault is still present, contact the Techline.
V3 MR-413-X44-38C050$101.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF187
CONTINUED
NOCheck that the "Automatic brake light" function is activated using status
ET030 Automatic brake light.
If the status ET030 "Automatic brake lights" is "PROHIBITED":
inhibit or authorise the automatic brake lights (depending on the country's legislation)
using command VP021 Automatic brake light inhibition or VP022 Automatic brake
light authorisation.
Check the condition and position of fuse F5 (15 A) in the passenger compartment
fuse box (see 81C, Fuse box).
Connector of components 1281, 1094 and intermediate union R107 disconnected,
Check the continuity of connection 4GJ between component 1281 and intermediate
union R107.
Check the continuity of connection 4GJ between intermediate union R107
and component 1094.
If the connections are faulty (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
With the connector of components 1281 and 1016 disconnected, check the continuity
and insulation of connection AP10 between components 1016 and 1281.
If the connection is faulty (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If all these checks are in order, replace component 1281.
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38C-58
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool
If the fault is still present, contact the Techline.
V3 MR-413-X44-38C050$102.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
DF188
PRESENT
OR
STOREDBRAKE LIGHT SWITCH CIRCUIT
1.DEF: Inconsistency
2.DEF: Permanent high signal
NOTESConditions for applying the fault finding procedure to stored faults:
Clear the stored fault, carry out a road test at a speed of > 36 mph (60 km/h) and test
the brakes using ABS.
Use the interpretation of the fault if it recurs.
Special notes:
The fault is detected if the computer does not detect a brake lights switch status change
for 4 acceleration/braking cycles and/or the contact is closed for over 6 minutes with
the vehicle speed above 24 mph (40 km/h).
Using the diagnostic tool, check on the status screen that ET017 Brake pedal recognises the correct pressed
and released positions of the brake pedal.
If the correct pedal position is not displayed, use the interpretation of ET017 Brake pedal.
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults
ESP_V05_DF188