ECU RENAULT TWINGO RS 2009 2.G Electrical Equipment - Petrol Injection Workshop Manual

17B-4V7 MR-413-X44-17B000$010.mif
PETROL INJECTION
Fault finding – Introduction17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Faults
Faults are declared present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but are not diagnosed within the current context).
The present or stored status of faults should be considered when using the diagnostic tool after the + after ignition
feed is switched on (without any action on the system components).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the Notes section.
If the fault is confirmed when the instructions are applied, the fault is present. Deal with the fault.
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the faulty component,
–the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool when the data
is inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer complaint,
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them
If a status does not function normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding pages (see interpretation of statuses and parameters).
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed by
customer complaints.
A synopsis of the general procedure to follow is provided on the following page in the form of
a flow chart.

17B-11V7 MR-413-X44-17B000$030.mif
PETROL INJECTION
Fault finding – System operation17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Engine immobiliser
The SIM 32 computer manages an engine immobiliser program:
–The Verlog 4 type immobiliser function is managed by the UCH computer and the engine management computer.
Before any customer request, the engine management computer and UCH exchange authentication frames via the
multiplex network to determine whether or not to start the engine.
After more than five consecutive failed authentication attempts, the engine management computer goes into
protection (antiscanning) mode and no longer tries to authenticate the UCH. It only leaves this mode when the
following sequence of operations is carried out:
–the ignition is left on for at least 60 seconds,
–the signal is cut off,
–the injection computer self-supply cuts out when it should (the time varies according to engine temperature).
After this, only one authentication attempt is allowed. If this fails again, repeat the sequence of operations described
above.
If the engine management computer still fails to unlock, contact the Techline.
Impact detected
If an impacthas been stored by the injection computer (ET077 Impactdetected), switch off the ignition for10 seconds,
thenswitch it back on so that the e ngine can b e started. Then clear the faults using commandRZ0 01 Fault memory.
Fuel supply
Fuel is supplied by the fuel pump. It is controlled each time the ignition is switched on, for 1 second, to provide a
certain pressure level in the circuit, and thereby achieve correct engine starting, particularly if the vehicle has not
been used for a long time. When the engine is running, the fuel pump relay is always controlled.
Injection
The injectors are controlled according to several modes. The engine is started in "semi-full group" mode (injectors
1 and 4, then injectors 2 and 3 simultaneously). This is to ensure correct engine starting whether or not it is correctly
phased, then it enters sequential mode.
It can sometimes, though rarely, happen that the engine starts when incorrectly phased. Then, after it has changed
to sequential injection mode and as long as the cylinder 1 recognition program has not taken place, the injectors are
offset by two cylinders: injection occurs in 4-2-1-3 order instead of the expected 1-3-4-2.
Injection timing is continuously calculated. It can be zero in the event of cut-off whilst decelerating or overrevving for
example.
Engine phasing
SIM 32 D4F 764 injection systems are equipped with a delayed continuous inlet camshaft dephaser.
The injection receives the position of the camshaft dephaser given by the camshaft sensor signal.
This position does not recognise whether the camshaft dephaser is in defect mode or not.
There are two types of defect mode associated with the various types of camshaft dephaser faults:

17B-17V7 MR-413-X44-17B000$030.mif
PETROL INJECTION
Fault finding – System operation17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Summary table of malfunction modes:
Types SpecialEffects on the
engineCustomer complaints
Electrical
faults on
resistor or
wiringThermostat
faults–Open short
circuit
–Short circuit to
+ 12 V0%Coolant temperature
≈ 110˚C, limited
performance, low
temperature
reference value.Overheating warning light
comes on at each first
opening, high temperature on
instrument panel, fan
assembly 1 activated.
–Short circuit
100%Coolant temperature
≈ 90˚C, limited
performance, low
temperature
reference value.Normal operation for
customer but performance
limited by 10 to 20%.
Sensor
faults–All
Low
temperature
modeForced low
temperature mode,
with no limited
performance.No visible effect, impact on
fuel consumption with
permanent low
temperature operation.
Thermostat
faults
detectedNominalNo change of mode
when requested.Overheating warning light
lighting on first opening,
display of an additional
square if the mode is
changed.
Non-
electrical
faultsThermostat
faults
detected–Thermostat
stuck in closed
positionAll modesNo cooling, engine
overheating, engine
damage.Instrument panel display,
overheating warning, torque
reduction.
–Thermostat
stuck in open
position
All modesSlow increase in
temperature.Overconsumption of petrol
when cold, unsuitable
passenger compartment
temperature, possible
performance reduction when
cold.

17B-23V7 MR-413-X44-17B000$060.mif
PETROL INJECTION
Fault finding – Features17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Engine immobiliser
The SIM 32 computer manages an engine immobiliser program:
–The Verlog 4 type immobiliser function is managed by the UCH computer and the engine management computer.
Before any customer request, the engine management computer and UCH exchange authentication frames via the
multiplex network to determine whether or not to start the engine.
After more than five consecutive failed authentication attempts, the engine management computer goes into
protection (antiscanning) mode and no longer tries to authenticate the UCH. The engine management computer only
exits this mode if the following sequence of operations is respected:
–the ignition is left on for at least 60 seconds,
–the signal is cut off,
–the injection computer self-feed deactivates when it should (the time varies according to engine coolant
temperature.
Following this sequence of operations, a single authentication attempt is authorised. If this fails again, repeat the
sequence of operations described above.
If the engine management computer still fails to unlock, contact the Techline.
Impact detected
If an impact has been stored by the injection computer (ET077 Impact detected), switch off the ignition for
10 seconds, then switch it back on so that the engine can be started. Then clear the faults using command RZ001
Fault memory.
Fuel supply
Fuel is supplied by the fuel pump. It is controlled each time the ignition is switched on, for 1 second, to provide a
certain pressure level in the circuit, and thereby achieve correct engine starting, particularly if the vehicle has not
been used for a long time. When the engine is running, the fuel pump relay is always controlled.
Injection
The injectors are controlled according to several modes. In particular, the engine is started in semi-full group mode
(injectors 1 and 4, then injectors 2 and 3 simultaneously), to ensure a correct start whether or not it is correctly
phased, then it enters sequential mode.
It can sometimes, though rarely, happen that the engine starts when incorrectly phased.
Then, after it has changed to sequential injection mode and as long as the cylinder 1 recognition program has not
taken place, the injectors are offset by two cylinders: injection occurs in the order 4-2-1-3 instead of the expected
order 1-3-4-2.
Injection timing is continuously calculated. It can be zero in the event of cut-off whilst decelerating or overrevving for
example.

17B-237V7 MR-413-X44-17B000$152.mif
PETROL INJECTION
Fault finding – Interpretation of statuses17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
ET557CRUISE CONTROL/SPEED LIMITER DEACTIVATION BY

FUNCTION
STATUS
DEFINITIONSTATUS 1: This status indicates that deactivation occurs when vehicle speed is
considered invalid.
STATUS 2: This status indicates that deactivation occurs when the injection computer
detects a fault.
STATUS 3: This status indicates that deactivation occurs due to a cruise control/speed
limiter fault.
STATUS 4: This status indicates that deactivation is executed when there is an
inconsistency between the request and the vehicle speed.
STATUS 5: This status indicates that deactivation occurs after a traction control
request.
NOTESCruise control remains deactivated as long as the vehicle speed does not exceed
a speed V >18 mph (30 km/h).
IMPORTANT
Certain deactivations are stored by the computer.
To reinitialise this status, run RZ001 Fault memory.
SIM32_V44_ET557/SIM32_V4C_ET557/SIM32_V50_ET557/SIM32_V54_ET557
AFTER REPAIRCarry out a road test followed by a check with the diagnostic tool.