Page 57 of 101

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.
Page 58 of 101

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
Page 59 of 101

38C-59
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
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF189
PRESENT
OR
STOREDCOMBINED SENSOR CIRCUIT
NOTESUse Wiring Diagram Technical Note, New Twingo.
Check the condition and position of fuse F10 (5 A) in the passenger compartment fuse box (see 81C, Fuse
box).
Check the connection and condition (possible wiring damage) of the connectors of components 1175,1094 and
1016.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Check the connection and condition (possible wiring damage) of intermediate connector R107.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Connector of components 1175, 1094, 1016 and intermediate union R107 disconnected.
–check the insulation and continuity of connection AP5 between components 1175 and 1016.
–check the insulation and continuity of connection AP5 between component 1094 and intermediate connector
R107.
–check the insulation and continuity of connection MAM of component 1175 (tightness, oxidation, etc.).
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the wiring, otherwise replace it.
ESP_V05_DF189
Page 60 of 101

38C-60
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
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF190
PRESENT
OR
STOREDCOMBINED SENSOR
1.DEF: Sensor internal electronic fault
2.DEF: Sensor incorrectly fitted
3.DEF: Abnormal voltage
NOTESUse the Wiring Diagram Technical Note for New Twingo.
1.DEF
NOTESNone.
Replace component 1175 (see MR 411 Mechanical, 38C, Anti-lock braking system, Lateral acceleration and
yaw speed sensor, Removal - Refitting) then it is essential to clear the ESP sensor offsets using command
RZ011 Sensor offsets.
2.DEF
NOTESNone.
Check the connection and condition (possible wiring damage) of the connector of component 1094.
Check the connection and condition (possible wiring damage) of the connector of component 1175.
Check the connection and condition (possible wiring damage) of intermediate connector R107.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Check the continuity of connections 4AP and 4AH between components 1094 and 1175.
If the connection or connections are faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring, otherwise replace it.
Check that component 1175 is fitted and attached correctly (the arrow indicates the front of the vehicle).
ESP_V05_DF190
Page 61 of 101
38C-61
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
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF190
CONTINUED
3.DEFNOTESNone.
Check the tightness and condition of the battery terminals (see 80A, Battery).
Check the charging circuit (see 16A, Starting - Charging).
Apply the fault finding procedure for fault DF189 Combined sensor circuit.
Page 62 of 101
38C-62
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
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF191
PRESENT
OR
STOREDESP ON/OFF BUTTON CIRCUIT
CO.0: Open circuit or short circuit to earth
NOTESSpecial notes:
This fault does not cause the warning lights to come on or a fault message on the
instrument panel.
The ESP is not faulty, but it is no longer possible to disable the ESP using the button.
Apply the interpretation of status ET023 ESP on/off button.
ESP_V05_DF191
Page 63 of 101

38C-63
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
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF193
PRESENT
OR
STOREDINJ. MULTIPLEX SIGNALS INVALID
NOTESSpecial notes:
Even though it is stored in the computer, the ABS/ESP system is not faulty.
The ESP is deactivated following unusable information from the injection system.
Perform fault finding on the injection system using the diagnostic tool.
Note:
The injection does not always store these transient faults as quickly as the ABS/ESP.
Note:
Once the fault in the injection system has been repaired, clear the ABS/ESP computer
fault memory.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present when the engine is started.
Check the injection computer (see 13B, Diesel injection or 17B, Petrol injection) using the diagnostic tool.
Run a multiplex network test (see 88B, Multiplex).
ESP_V05_DF193
Page 64 of 101

38C-64
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
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF202
PRESENT
OR
STOREDUCH MULTIPLEX SIGNALS DISABLED
DEF: Reverse gear signal consistency
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.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present when the engine is started.
Run a check on 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_DF202