battery RENAULT TWINGO 2009 2.G Chasiss - Power Assisted Steering Workshop Manual

36B-6
MR-413-X44-36B000$067.mif
V2
POWER – ASSISTED STEERING
Fault finding – Introduction
EPAS
Vdiag No.: 04 - 08
36B
5. FAULT FINDING LOG
You will always be asked for this log:
–when requesting technical assistance from Techline,
–for approval requests when replacing parts for which approval is mandatory,
–to be attached to monitored parts for which reimbursement is requested. The log is needed for warranty
reimbursement, and enables better analysis of the parts removed.
6. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
–check the battery voltage to avoid incorrect operation of computer functions,
–use the appropriate tools,
–do not touch the discharge bulbs, and do not work on the COSLAD system when it is in operation, as the
voltage can be above 20,000 V. IMPORTANTIMPORTANT
Any fault on a complex system requires thorough fault finding with the appropriate tools.
The FAULT FINDING LOG, which should be completed during the procedure, enables you to
keep track of the procedure which is carried out. It is an essential document when consulting
the manufacturer.
IT IS THEREFORE ESSENTIAL THAT THE FAULT FINDING LOG IS FILLED OUT EVERY TIME IT IS
REQUESTED BY TECHLINE OR THE WARRANT RETURNS DEPARTMENT.

36B-11
MR-413-X44-36B000$268.mif
V2
POWER – ASSISTED STEERING
Fault finding – Function
EPAS
Vdiag No.: 04 - 08
36B
GENERAL OPERATION
On this vehicle, the steering system is power-assisted by an electric motor attached to the steering column.
The torque sensor and steering column angle sensor interpret any movement of the steering wheel as it is turned.
Assistance is provided by an electric motor which applies more or less torque to the steering column, in one direction
or the other.
A computer controls this assistance according to several vehicle environment parameters, including the vehicle
speed.
EPAS ALSO OFFERS THE FOLLOWING:
Active recall:
This function is made necessary by the design of the front axle of vehicles with electric power-assisted steering.
It returns the steering wheel to the centre point when driving at low speeds (5 to 20 mph / 8 to 32 km/h) but not when
the vehicle is stationary. This function is normal on hydraulic power-assisted steering vehicles or vehicles without
assistance.
This function cannot be deactivated by the diagnostic tool.
Depending on the operating conditions and the operations performed on the vehicle before switching on the ignition,
the assistance system may take a certain amount of time to be activated after engine starting, for instance after
battery cut-off or switching off the ignition (see Configurations and programming).Note:
When the computer detects a fault, the level of assistance can be modified depending on how serious the fault is.
An incorrect or absent vehicle speed signal results in assistance equal to that provided at 72 mph (120 km/h)
without active return. The EPAS sends a "Steering wheel angle signal" to the ABS/ESP computer.

36B-13
MR-413-X44-36B000$335.mif
V2
36B
POWER – ASSISTED STEERING
Fault finding – Replacement of components
Precautions for use
–The electric motor and upper column (EPAS system) assembly cannot be taken apart.
–Only reuse an EPAS system from one vehicle on another vehicle if the column and computer part numbers match.
A. Replacing the EPAS (computer - top steering column assembly):
Before replacing the EPAS, run fault finding on the system: apply the appropriate fault finding procedure.
The EPAS may be replaced only with the consent of the Techline.
When replacing the electric power assisted steering, carry out the following operations in order:
–disconnect the vehicle battery,
–replace the EPAS (see MR411 Mechanical systems, 36B, Power-assisted steering),
–reconnect the vehicle battery,
–connect the diagnostic tool, switch on the ignition and establish dialogue with the electric power-assisted
steering computer (EPAS computer),
–perform the configurations (see Configurations and programming),
–check that there are no faults, check the conformity of the variables, and check that the EPAS operates correctly
(steering assistance provided when the engine is running),
–perform a road test then, without switching off the ignition, check that status ET020 Steering wheel angle
sensor programming is Programmed (only for Vdiag 04).
B. Replacing the intermediate shaft or the steering rack (without changing the EPAS):
–disconnect the vehicle battery,
–replace the intermediate shaft or the steering rack (see MR 411 Mechanical systems, 36A, Steering
assembly),
–reconnect the vehicle battery,
–connect the diagnostic tool, switch on the ignition and establish dialogue with the electric power-assisted
steering computer (EPAS computer),
–check that there are no faults,
–check that the EPAS is working correctly (steering assistance available when the engine is running).
C. Replacing the power-assisted steering computer:
–disconnect the vehicle battery,
–replace the power-assisted steering computer,
–reconnect the vehicle battery,
–connect the diagnostic tool, switch on the ignition and establish dialogue with the electric power-assisted
steering computer (EPAS computer),
–configure the computer (see Configurations and programming),
–check that there are no faults,
–check that the EPAS is working correctly (steering assistance available when the engine is running). WARNING
Never leave the ignition switched on or the engine running during a mechanical operation on the EPAS or the
front axle. To avoid any accident, the battery must be disconnected (to prevent the risk of accidentally triggering
the EPAS motor).
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$335.mif

36B-15
MR-413-X44-36B000$469.mif
V2
36B
POWER – ASSISTED STEERING
Fault finding – Fault summary table
Tool fault Diagnostic tool titleAssociated
DTCCustomer complaints and warning
light coming on
DF001Motor thermal protection5660Steering assistance intermittent
reduction (no warning light or buzzer)
DF002Computer5640No assistance on start-up or sudden
loss of assistance with EPAS fault
warning light, STOP warning light and
buzzer
DF017Motor circuit5630Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF023+ after ignition feed5622Gradual loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF028Engine speed zero5621Incorrect level of assistance (no warning
light or buzzer)
DF037Battery voltage5650Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF038Angle sensor5610Loss of "active return" function with no
warning light
DF039Torque sensor circuit5603Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF043Vehicle speed5620Incorrect level of assistance (no warning
light or buzzer)
DF048Torque sensor circuit5602Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF050Torque sensor circuit signal 25601Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
DF054Torque sensor5600Sudden loss of assistance with EPAS
fault warning light, STOP warning light
and buzzer
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$469.mif

36B-16
MR-413-X44-36B000$469.mif
V2
EPAS
Vdiag No.: 04 - 08
36B
DF001
PRESENT
OR
STOREDMOTOR THERMAL PROTECTION
DEF: Operating temperature too high
NOTESConditions for applying the fault finding procedure to stored faults:
Apply this fault finding procedure even if the fault is stored.
Notes:
This fault does not indicate a system failure, but indicates overheating either of the
Electric Power-Assisted Steering (EPAS) motor or of the computer during repeated
manoeuvres.This fault may appear after the steering wheel is moved repeatedly
(parking) and causes a gradual reduction in steering but the fault warning light does
not come on.
Use the diagnostic tool to check the conformity of PR129 Motor power (60 A) and PR130 Motor power (45 A)
(zero in absence of PR001 Torque applied to steering wheel).
Contact the Techline in the event of any nonconformity.
Check the conformity of the computer and steering column (45 or 60 A) in relation to the table below:
Left-hand drive Right-hand drive
Torque sensor wiring harness blue black
Motor wiring45 Agreen black
Motor wiring60 Ablue grey
45 A 60 A
Computer label yellow white
In the event of a nonconformity, consult "RENAULT NET" to repair the vehicle according to the technical vehicle
definition.
Disconnect the battery then allow the electric power-assisted steering to cool down.
Reconnect the battery, clear the faults, start the vehicle and check the operation of the electric power-assisted
steering by turning the steering wheel full lock to the left or right.
The fault should not recur in the next 30 seconds.
If the fault recurs as present or stored, contact the Techline.
AFTER REPAIRDeal with any other faults.
Clear the stored faults.
Check that the EPAS is working.
DAE_V04_DF001 /DAE_V08_DF001
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults

36B-21
MR-413-X44-36B000$469.mif
V2
POWER – ASSISTED STEERING
Fault finding – Interpretation of faults
EPAS
Vdiag No.: 04 - 08
36B
DF037
PRESENT
OR
STOREDBATTERY VOLTAGE
1. DEF: Under voltage
2. DEF: Excess voltage
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after starting the engine and turning the steering wheel
from lock to lock left to right.
Notes:
This fault causes:
Sudden loss of steering assistance with illumination of the Fault warning light +
STOP + Beep.
Use the Wiring Diagram Technical Note for New Twingo.
Check the tightness and condition of the battery terminals (see 80A, Battery).
Check the charging circuit (see 16A, Starting - Charging).
Check the condition and position of the 80 A fuse in the engine fuse and relay box.
Check the condition and position of fuse F3 (15 A) fuse in the passenger compartment fuse box (see 81C,
Fuse box).
With the ignition on and the engine stopped, check for a voltage equal to the battery voltage on connections BP81
and AP23 against earth ML.
With the connectors of component 502 disconnected, check the condition and conformity of the connectors and
their clips.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
With the connectors of components 597 and 1016 disconnected:
Check the continuity and insulation of connection BP81 between components 502 and 597.
Check the continuity and insulation of connection AP23 between components 502 and 1016.
Check the continuity and insulation of connection ML of component 502.
If the connection or connections are faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring, otherwise replace it.
If the checks reveal no faults, check the conformity of components 597 and 1016.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other faults.
Clear the stored faults.
Check that the EPAS is working.
DAE_V04_DF037/DAE_V08_DF037

36B-26
MR-413-X44-36B000$536.mif
V2
POWER – ASSISTED STEERING
Fault finding – Conformity check
EPAS
Vdiag No.: 04 - 08
36B
SUB-FUNCTION: ASSISTANCE
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool.
Application conditions: ignition on, engine stopped, no movement of
the steering wheel, front wheels set straight ahead.
FunctionParameter or Status
Checked or ActionDisplay and notes Fault finding
Power supplyPR032:Feed voltage0 VIn the event of a fault on this
parameter, apply the fault finding
procedure of DF037 Battery voltage.
Wire informationPR003:Vehicle speed0 mphIn the event of a fault, apply the
interpretation of parameter PR003.
PR004:Engine speed0 rpmIn the event of a fault, apply the
interpretation of parameter PR004.
Steering wheel
angle
(Vdiag 04 only)ET020:Steering
wheel angle
sensor
programmingNot programmedIn the event of a fault, apply the
interpretation of status ET020.
PR121:Steering
wheel angle- 5˚ < X < 5˚In the event of a fault, apply the
interpretation of parameter PR121.
FaultsET021:Motor thermal
protection
indicatorNot activeIn the event of a fault, apply the
interpretation of status ET021.
ET025:Fault indicatorOffIn the event of a fault, apply the
interpretation of status ET025.

36B-29
MR-413-X44-36B000$536.mif
V2
POWER – ASSISTED STEERING
Fault finding – Conformity check
EPAS
Vdiag No.: 04 - 08
36B
SUB-FUNCTION: ASSISTANCE
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool.
Application conditions: engine at idle speed, no movement of the steering
wheel, front wheels straight ahead.
FunctionParameter or Status
Checked or ActionDisplay and notes Fault finding
Power supplyPR032:Feed voltage12 < X < 16 VIn the event of a fault on this
parameter, apply the fault finding
procedure of DF037 Battery
voltage.
Wire informationPR003: Vehicle speed0 mphIn the event of a fault, apply the
interpretation of parameter
PR003.
PR004:Engine speed850 +/- 50 rpmIn the event of a fault, apply the
interpretation of parameter
PR004.
Steering wheel
angle (Vdiag 04
only)ET020:Steering wheel
angle sensor
programmingNot programmedIn the event of a fault, apply the
interpretation of status ET020.
PR121:Steering wheel
angle- 5˚ < X < 5˚In the event of a fault, apply the
interpretation of parameter
PR121.
FaultsET021:Motor thermal
protection
indicatorNot activeIn the event of a fault, apply the
interpretation of status ET021.
ET025:Fault indicatorOffIn the event of a fault, apply the
interpretation of status ET025.

36B-43
MR-413-X44-36B000$938.mif
V2
36B
POWER – ASSISTED STEERING
Fault finding – Fault finding Chart
ALP 1 No dialogue with the computer
NOTESUse the Technical Note wiring diagram for New Twingo.
Try to establish dialogue with a computer on another vehicle to check that the diagnostic tool is not faulty.
If the tool is not faulty and no dialogue is established with any other computer of the same vehicle, check the
tightness and condition of the battery terminals (see 80A, Battery).
Check the charging circuit (see 16A, Starting - Charging).
With connector A of component 502 and the connector of components 1222 and 1094 disconnected, check the
continuity and insulation of connection HK between components 502 and 225.
If the connection(s) are faulty and there is a repair method (see Technical Note 6015A, Repairing electrical
wiring, W iring: Precautions for repair), repair the wiring, otherwise replace it.
If the checks reveal no faults, check the conformity of components 1022 and 1094.
Check the condition and the position of the 80 A fuse in the engine fuse and relay box.
Check the condition and the position of fuse F3 (15 A) in the passenger compartment fuse box.
With the ignition on and the engine stopped, check for a voltage equal to the battery voltage on connections BP81
and AP23 against earth ML.
Connectors of component 502 disconnected, check the condition and conformity of the connectors and clips.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
With the connectors of components 597 and 1016 disconnected:
Check the continuity and insulation of connection BP81 between components 502 and 597.
Check the continuity and insulation of connection AP23 between components 502 and 1016.
Check the continuity and insulation of connection ML of component 502.
If the connection(s) are faulty and there is a repair method (see Technical Note 6015A, Repairing electrical
wiring, W iring: Precautions for repair), repair the wiring, otherwise replace it.
If the checks reveal no faults, check the conformity of components 597 and 1016.
If the fault is still present, contact Techline.
AFTER REPAIRPerform a test using the diagnostic tool.
DAE_V04_ALP1/ DAE_V08_ALP1
EPAS
Vdiag No.: 04 - 08
MR-413-X44-36B000$938.mif

36B-52
MR-413-X44-36B000$938.mif
V2
POWER – ASSISTED STEERING
Fault finding – Fault finding Chart
EPAS
Vdiag No.: 04 - 08
36B
ALP 10 NO ASSISTANCE ON START-UP
NOTESOnly consult this customer complaint after a complete check with the
diagnostic tool.
Use the Technical Note wiring diagram for New Twingo.
Connectors of component 502 disconnected, check the condition and conformity of the connectors and clips.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
With the connector of component 1016 disconnected:
Check the continuity and insulation of connection AP23 between components 502 and 1016.
Check the continuity and insulation of connection ML of component 502.
If the connection or connections are faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring, otherwise replace it.
If the checks reveal no faults, perform a conformity check of component 1016.
Check the battery voltage and carry out any operations necessary to obtain a correct voltage
(10 V < battery voltage < 16 V, see MR 411 Mechanical systems, 16A, Starting - Charging).
Apply the fault finding procedure for fault DF028 No engine speed.
If the fault is still present, contact Techline.
AFTER REPAIRPerform a test using the diagnostic tool.
DAE_V04_ALP10 /DAE_V08_ALP10