Page 28 of 76

38C-28
MR-413-X44-38C000$470_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults38C
DF027
PRESENT
OR
STOREDREAR RIGHT-HAND WHEEL SPEED SENSOR CIRCUIT
1.DEF: Fault on the wheel speed sensor circuit
NOTESConditions for applying the fault finding procedure to stored faults:
Follow the fault finding procedure described below for DF027 stored.
Use the Technical Note wiring diagram for New Twingo.
DF027 PRESENT
NOTESNone
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
Check the connection and condition (possible damage to the wiring) of the connector of component 150.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Check for a voltage of approximately 12 V between the two connections of component 150 near
component 1094.
Is the voltage measured correct?
YES
Check the insulation and continuity of connections 4S and 4T between
components 150 and 1094.
Also check the insulation between these 2 connections.
If the connection or connections are faulty (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the connectors or wiring,
otherwise replace the wiring.
If the checks reveal no faults, replace the speed sensor (see MR411 Mechanical
systems, 38C Wheel speed sensor, Removal - Refitting).
Check the insulation and continuity of connections 4S and 4T between
components 150 and 1094.
Also check the insulation between these 2 connections.
If the connection or connections are faulty (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the connectors or wiring,
otherwise replace the wiring.
If all the checks are in order, contact Techline.
NO
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF027
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38C-42
MR-413-X44-38C000$517_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF152
PRESENT
OR
STOREDMULTIPLEX NETWORK
1.DEF: Multiplex line connection fault
NOTESSpecial notes:
If several computers are affected by a similar multiplex network fault, contact the
Techline to check the cases previously noted first.
Conditions for applying the fault finding procedure to stored faults:
Apply the fault finding procedure as below.
Use the Technical Note wiring diagram for New Twingo.
If no other computer has detected the failure of the multiplex network but only the absence of ABS frames, carry
out the following checks:
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
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 Insulation and continuity of connections 133B, 133C and HK of component 1094.
Also check the insulation between these connections.
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the connectors or wiring, otherwise replace the wiring.
Run a multiplex network test (see 88B, Multiplex).
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.
ABS_V04_DF152
Page 53 of 76

38C-53
MR-413-X44-38C000$658_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of statuses
ET017
BRAKE PEDAL
NOTESSpecial notes:
Only carry out the checks if the PRESSED and RELEASED statuses are inconsistent
with the pedal position.
Use the Technical Note wiring diagram for New Twingo.
STATUS
"RELEASED"
Brake pedal
depressed
If brake lights operate:
–Check the continuity of connection 65A between components 160 and 1094.
If the connector is faulty (see NT6015, Repairing electrical wiring, wiring: Precaution
for repairs), repair the connector, otherwise replace the wiring.
If the brake lights are not working:
–Check the condition, mounting and adjustment of the brake light switch and the
conformity of the bulbs.
–Remove the brake light switch and check that it is operating correctly:
Connection continuity Connection insulation
Switch pressed
(Brake pedal released)AP10 and 5A AP10 and 65A
Switch released
(Brake pedal depressed)AP10 and 65A AP10 and 5A
–Replace the switch if necessary.
Intermediate connector R107 and component 160 and 1081 disconnected:
–Check the continuity and insulation of connection AP10 between
component 1016 and intermediate connector R107.
–Check the continuity and insulation of connection AP10 between
component 160 and intermediate connector R107.
If the connector is faulty (see NT6015, Repairing electrical wiring, wiring:
Precaution for repairs), repair the connector or the wiring, otherwise replace the
wiring.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ET017
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$658_eng.mif