2009 RENAULT TWINGO Chasiss ABS Workshop Manual

38C-25
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF020
PRESENT
TACHOMETRIC INDEX PROGRAMMING
1.DEF: Tachometric index not programmed
NOTESNone
The MK70 ABS computer with the tachometric function 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 ABS computer calculates the vehicle speed from the speed of the wheels and the circumference of the tyres
fitted on the vehicle.
The tyre circumference must be programmed into the memory of a new computer. This consists of
entering an index "X" using command VP007 "TACHOMETRIC INDEX" using the diagnostic tool.
Once the index has been entered using the VP007 command, clear the computer fault memory and then switch
off the ignition.
Use the PR030 parameter to check that the index has been stored correctly.
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_DF020P

38C-26
MR-413-X44-38C000$470_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults38C
DF026
PRESENT
OR
STOREDFRONT 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 DF026 stored.
Use the Technical Note wiring diagram for New Twingo.
DF026 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 152.
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 152 near component 1094.
Is the voltage measured correct?
YES
Swap the 2 front wheel speed sensors over. Clear the computer fault memory.
Switch off the ignition. Switch on the ignition again.
If a fault, which was initially registered as DF026 Front right-hand wheel speed
sensor circuit becomes present DF006 Front left-hand wheel speed sensor circuit,
replace the wheel speed sensor (see MR411 Mechanical, 38C, ABS, Wheel speed
sensor: Removal - Refitting).
If the fault remains on the same side, the wiring between the computer and the sensor is
faulty.
Check the insulation and continuity of connections 4M and 4N between
components 152 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.
Check the insulation and continuity of connections 4M and 4N between
components 152 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_DF026

38C-27
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF026
CONTINUED
DF026 STORED
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 152.
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 4M and 4N between components 152 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.
Swap the 2 front wheel speed sensors over.
Clear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
If a fault, which was initially registered as DF026 Front right-hand wheel speed sensor circuit becomes
present DF006 Front left-hand wheel speed sensor circuit, replace the wheel speed sensor (see MR411
Mechanical, 38C, ABS, Wheel speed sensor: Removal - Refitting).
If the fault remains on the same side, the wiring between the computer and the sensor is faulty.
Check the insulation and continuity of connections 4M and 4N between components 152 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.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.

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

38C-29
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF027
CONTINUED
DF027 STORED
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 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 wiring, otherwise replace the wiring.
Clear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
If the fault is still present, contact Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.

38C-30
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF028
PRESENT
OR
STOREDFRONT RIGHT-HAND WHEEL SPEED SENSOR SIGNAL
1.DEF: Inconsistent sensor signal
2.DEF: No vehicle speed signal
3.DEF: Inconsistent vehicle speed
NOTESPriorities when dealing with a number of faults:
Deal with fault DF026 Front right wheel speed sensor circuit first if it is present.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present during a road test (in excess of 12 mph (20 km/h)
for 2 minutes).
Check the condition of the axle assemblies (impacts, damage, etc.) and the conformity and good condition of the
tyres.
Check that the braking system (condition of brake pads, sealing, sticking, bleed, bearing clearance, etc.) is in
good condition.
Visually inspect the condition of the target (for clogging, 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) using the special command SC001 Check
target teeth.
If there is non-conformity, replace the target.
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 152.
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 152 near
component 1094.
If a 12 V feed is not present, contact the Techline.
If all the checks are in order, swap the 2 front wheel speed sensors. Clear the computer fault memory.
Switch off the ignition. Switch the ignition back on and carry out a road test.
If a fault, which was initially registered as DF028 Front right-hand wheel speed sensor signal has become
present DF008 Front left-hand wheel speed sensor signal, replace the wheel speed sensor (see MR411
Mechanical systems, 38C, Wheel speed sensor: Removal - Refitting).
If the fault stays on the same side, the target is faulty, replace the active sensor bearing.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF028

38C-31
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF029
PRESENT
OR
STOREDREAR RIGHT-HAND WHEEL SPEED SENSOR SIGNAL
1.DEF: Inconsistent sensor signal
2.DEF: No vehicle speed signal
3.DEF: Inconsistent vehicle speed
NOTESPriorities when dealing with a number of faults:
Deal first with fault DF027 Rear right-hand wheel speed
sensor circuit if it is present.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present during a road test (in excess of 12 mph (20 km/h)
for 2 minutes).
Check the condition of the axle assemblies (impacts, damage, etc.) and the conformity and good condition of the
tyres.
Check that the braking system (condition of brake pads, sealing, sticking, bleed, bearing clearance, etc.) is in
good condition.
Visually inspect the condition of the target (for clogging, 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) using the special command SC001 Check
target teeth.
If there is non-conformity, replace the target.
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.
If a 12 V feed is not present, contact the Techline.
If all the checks are in order, swap the 2 rear brake drums. Clear the computer fault memory.
Switch off the ignition. Switch the ignition back on and carry out a road test.
If the fault initially declared as DF029 Rear right-hand wheel speed sensor circuit signal has become present
DF009 Rear left-hand wheel speed sensor circuit signal, replace the complete drum. (see MR411 Mechanical
systems, 33A Rear axle components).
If the fault remains on the same side, replace the speed sensor (see MR411 Mechanical systems, 38C Wheel
speed sensor, Removal - Refitting).
Important, do not forget to refit the drums to the correct wheels.
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_DF029

38C-32
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF055
PRESENT
VEHICLE PARAMETER PROGRAMMING
1.DEF: Absence of vehicle parameter programming
NOTESNone
Configure the vehicle parameters with command VP004 "Vehicle parameters" in accordance with the vehicle
configuration.
Clear the fault memory, and initialise the computer (switch the + after ignition feed switch off and on again).
Check for any possible faults.
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_DF055P