2009 RENAULT TWINGO Electrical Equipment - Petrol Injection Workshop Manual

17B-25V7 MR-413-X44-17B000$060.mif
PETROL INJECTION
Fault finding – Features17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Richness
For the catalytic converter to operate correctly, adjust around richness 1.
The richness regulation controlled by the upstream sensor which ensures a richness of around 1.
The upstream sensor supplies a voltage according to the image of the average engine richness: the voltage supplied
to the computer represents a Rich-Lean signal.
For the upstream sensor to be operational very rapidly, it is heated. The heating works only when the engine is
running. It is deactivated at speeds above 84 mph (140 km/h) or when the engine is under load.
The downstream sensor is also heated. The command does not activate immediately after starting the engine. It is
activated when the engine is running and has reached its operating temperature. The downstream heating sensor is
deactivated at speeds above 84 mph (140 km/h) or when the engine is under load.
Torque management
The torque structure is the system for managing engine torque. The torque structure is required for certain functions
such as the electronic stability program (ESP) or sequential gearbox (BVR).
Each computer (ESP, BVR) sends a request for torque via the multiplex network to the injection computer. This
intervenes between the torque requests received and the driver's requests (made via the pedal or the cruise control/
speed limiter function). The result of this intervention is the torque setpoint to be applied. Using the torque reference
value, the structure calculates the throttle position reference value and the ignition advance and if the turbocharging
function is present, calculates the turbocharging solenoid valve reference value.
Engine coolant temperature management
Engine cooling is performed by one or two fan assemblies (depending on the vehicle equipment). The injection
computer requests the UCH to actuate them via the multiplex network.
To provide cooling when the engine is running, activation of fan assembly 1 is requested if the coolant temperature
exceeds 99˚C and is deactivated when the temperature drops below 96˚C.
Fan unit 2 starts when the coolant temperature exceeds 102˚C and stops when it falls below 99˚C.
With the engine off, only GMV1 may be activated to provide the anti-percolation function (if engine is stopped when
very hot). The anti-percolation function is active with the ignition off for a determined period. During this time, fan
assembly 1 is activated if the coolant temperature exceeds 100˚C and is deactivated when the temperature drops
below 95˚C.
If the engine temperature exceeds the warning threshold of 118˚C, the injection computer directly commands the
coolant temperature warning light to illuminate or requests this action from the instrument panel computer via the
multiplex network, until the coolant temperature drops back below 115˚C.
As well as managing the engine, the injection computer handles cooling requirements for the air conditioning and
sequential gearbox functions.

17B-26V7 MR-413-X44-17B000$060.mif
PETROL INJECTION
Fault finding – Features17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Air conditioning function
The SIM32 computer manages a "Cold Loop" type air conditioning system:
–request for air conditioning by logical link,
–acquisition of pressure in the air conditioning circuit,
–vehicle speed
–air conditioning compressor control,
–fan unit control for the requirements of this function.
The injection computer reconstitutes the power absorbed by the air conditioning compressor and fast idle speed
requests by using the pressure acquired in the air conditioning circuit.
These signals are necessary for adapting the engine management (idling speed regulation, air flow correction, etc.),
for several reasons:
–air conditioning compressor efficiency,
–more engine ruggedness due to torque hesitation caused by the compressor clutching and declutching,
–helping the alternator.
Fan unit 1 and/or 2 requests are reconstituted according to the pressure in the air conditioning circuit and the vehicle
speed. In summary, there are more fan unit requests when the speed is low and the pressure is high.
OCS - Customised Oil Change Interval (does not concern Vdiag 44 and 4C).
This program takes into account the driving style of the user to warn him of the need for an oil service. It counts the
number of revs per minute since the last oil service, corrected by a factor dependent on the oil temperature. When
this number of revs per minute exceeds a certain threshold, the customer is alerted by a message on the instrument
panel informing him that an oil service is required.
After the oil service, the user must reset the oil service interval on the instrument panel.
To find out if the engine concerned uses this programming, consult ET840 Customised Oil Change Interval.
OBD
The OBD programs are as follows:
–catalytic converter fault finding,
–upstream sensor operational fault finding,
–misfire fault finding,
–fuel supply system fault finding.
The misfiring and fuel supply system fault finding is performed continuously. The operational fault finding for the
upstream sensor and the catalytic converter can be only be carried out once per journey, and can never take place
at the same time.

17B-27V7 MR-413-X44-17B000$060.mif
PETROL INJECTION
Fault finding – Features17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
OBD fault manager:
The European On Board Diagnostic (EOBD) fault manager neither replaces nor modifies the conventional
management of electrical faults. It is an additional feature to satisfy the EOBD* standard. The requirements are:
–to store EOBD* faults,
–to store the engine context when the EOBD* stored fault is detected,
–to illuminate the OBD warning light for all faults that cause the EOBD* emissions thresholds to be exceeded,
–to make the OBD warning light flash for all combustion misfire faults that damage the catalytic converter.
*EOBD:
* OCR:

17B-28V7 MR-413-X44-17B000$070.mif
17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
1. OPERATING SAFETY
Activation of the warning lights
The SIM32 injection system manages the illumination of three warning lights according to the severity of the faults
detected, to inform the customer and to assist with fault finding.
The injection computer manages the activation of the warning lights on the instrument panel. These warning lights
illuminate during the starting phase and in the event of an injection fault or engine overheating.
The warning light activation commands are sent to the instrument panel.
Warning light illumination principle
When the ignition is switched on, the OBD (On Board Diagnostic) warning light is illuminated for approximately
3 seconds and is then extinguished.
If there is an injection fault (severity level 1), the SERVICE warning light is illuminated.
It indicates a reduced level of operation and a limited safety level.
The user must carry out repairs as soon as possible:
–motorised throttle valve,
–accelerator pedal potentiometer,
–inlet manifold pressure sensor,
–computer,
–actuator feed,
–the computer power supply,
–turbocharger pressure sensor (for D4FT 780).
For faults requiring the driver to stop the engine quickly, the severity level 2 warning light is illuminated.
If a fault causing excessive exhaust gas pollution is detected, the orange OBD warning light engine symbol is
illuminated:
–the light flashes if the fault could lead to a risk of destroying catalytic converter (destructive engine misfire). If this
happens, the vehicle must be stopped immediately.
–the light is permanently illuminated if the emission control standards are not met (pollutant engine misfire,
catalytic converter fault, oxygen sensor fault, inconsistency between the oxygen sensors and a fuel vapour
absorber fault).
Mileage travelled with fault
The parameter PR106 Mileage counter fault warning light illuminated displays the mileage covered and
illuminates one of the injection fault warning lights: fault severity level 1 (amber) and 2 (red). The parameter
PR105 Mileage counter OBD fault warning light illuminated displays the mileage covered and illuminates the
OBD warning light.
This counter is reset to 0 using the diagnostic tool via the command RZ001 Fault memory.
PETROL INJECTION
Fault finding – Role of components

17B-29V7 MR-413-X44-17B000$070.mif
PETROL INJECTION
Fault finding – Role of components17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
3. INTERSYSTEM ENGINE FUNCTIONS
The intersystem connections relating to the particular requirements of the injection are as follows:
–The instrument panel computer requests illumination of the OBD warning light to warn of an emissions control fault.
–Requests illumination of the Severity level 1 warning light to warn of an operational safety fault related to the
injection system.
–Requests illumination of the Severity level 2 warning light to warn of an operational safety fault or engine
overheating.
–Requests activation of the fan assemblies (GMV) for engine cooling, but also for the air conditioning system and
sequential gearbox (BVR) functions.
–Request for air conditioning compressor switch-off for engine programming requirements such as starting,
performance, anti-stall, overspeed, etc.
–Passenger Compartment Heating Resistor cut-off or setting request for engine programming requirements such as
starting, performance, anti-stall, overspeed, etc.
–Request for gradual engagement of electrical consumers and to limit power: This last function is made possible by
the alternator being operated. This is used to improve the engine handling in critical operating phases, mainly when
idling and when starting. These requests are sent by the UCH via the CAN network where they are converted before
being sent to the alternator.

17B-30V7 MR-413-X44-17B000$070.mif
PETROL INJECTION
Fault finding – Role of components17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Injection computer:
The injection computer manages the entire system.
Its role is to define the engine optimum operating mode and to inform the driver (via the instrument panel, information
display, and buzzer) and to communicate with the other computers.
Fuel vapour recirculation solenoid valve:
The fuel vapour absorber works like a ''sponge'' for petrol vapours and enables gases coming from the tank to be
collected.
Upstream oxygen sensor:
This sensor measures the amount of oxygen in the exhaust gas.
The voltage supplied to the computer by the sensor indicates the amount of oxygen in the exhaust gas - a rich
mixture or a lean mixture - and a program is adopted accordingly.
Downstream oxygen sensor:
This sensor measures the amount of oxygen in the exhaust gas.
The voltage supplied to the computer by the sensor indicates the amount of oxygen in the exhaust gas - a rich
mixture or a lean mixture - and a program is adopted accordingly.
Pinking sensor:
The sensor detects engine knocking and sends its electrical signal to the injection computer.
Oil pressure sensor:
This sensor measures the engine oil pressure.
Turbocharger:
The turbocharger is used to supply the engine with more air.
Turbocharger pressure sensor:
This sensor indicates the pressure at the turbocharger air cooler outlet before the damper valve.
Ignition coil:
This acts both as an energy storage battery and a transformer. It generates high voltage ignition pulses and the
energy required to ignite the mixture.
Motorised throttle valve:
The motorised throttle valve supplies the engine with varying mixtures of fuel and air according to the load required.
This electronic control detects the position of the accelerator using a sensor (potentiometer) to inject the mixture.

17B-31V7 MR-413-X44-17B000$070.mif
PETROL INJECTION
Fault finding – Role of components17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
TDC sensor:
The angular position is measured using a magneto-inductive sensor triggered by the machined teeth on the engine
flywheel. This sensor gives the engine speed as well as the position of the crankshaft for injection.
Refrigerant pressure sensor:
Its role is to measure the refrigerant pressure in the air conditioning circuit.
Engine coolant temperature sensor:
The engine coolant temperature sensor informs the computer of the engine coolant temperature.
Air temperature sensor:
The air temperature sensor is fitted inside the inlet manifold and informs the computer of the temperature of the air
taken in by the engine.
Catalytic converter:
The role of the catalytic converter is to convert pollutant gases into harmless gases.
Cruise control/speed limiter on/off switch:
This switch is used to turn the cruise control/speed limiter on or off.
Fan unit relay:
This relay actuates the motor-driven fan assemblies when a temperature threshold has been exceeded.
Accelerator potentiometer:
The accelerator potentiometer informs the computer of the position of the accelerator pedal (engine load).
Clutch pedal switch:
The clutch pedal switch informs the computer of the clutch pedal status.
Inlet air temperature sensor:
Its role is to measure the air temperature in the inlet circuit.
Pinking sensor:
Its role is to check for pinking in the combustion chamber.
Oil level sensor:
This sensor measures the level of oil in the engine and sends this information to the computer.

17B-32V7 MR-413-X44-17B000$080.mif
17B
SIM 32 Injection
Program no.: D3
Vdiag No.: 44, 4C, 50
and 54
Defect modes
Motorised throttle valve
In defect mode, the motorised throttle valve can assume six different statuses.
ET564 Defect mode type 1
This type groups together the faults that prevent the throttle from being controlled.
It causes the throttle control to be stopped: the throttle is in its safe position. By depressing the pedal, it is possible
to modulate the torque by cylinder cut-off and advance in order to keep the vehicle running.
The ESP, cruise control/speed limiter and automatic/sequential gearbox systems change to "defect mode". This
defect mode is always accompanied by the Type 2 defect mode.
ET565 Defect mode type 2
This type groups together the faults preventing the system from controlling the air flow modulation.
The associated defect mode limits engine speed by cutting off the injection (limiting engine speed to 2400 rpm at idle
speed and to 3500 rpm in other gears).
ET566 Defect mode type 3
This type groups together faults allowing you to deduce that the system has lost the accelerator pedal signal, but still
controls the air flow modulation (motorised throttle servo operational). Defect mode is associated with a constant
pedal setpoint for each gear ratio. The vehicle speed can vary by changing gear.
Suggested speeds on a flat road:
–12 mph (20 km/h) max in 1 - st,
–21 mph (35 km/h) max in 2 - nd,
–27 mph (45 km/h) max in 3 - rd,
–39 mph (65 km/h) max in 4 - th,
–below 54 mph (90 km/h) in 5 - th and 6 - th.
ET567 Defect mode type 4
This type covers faults that affect the motorised throttle valve monitoring system, the pedal and the turbocharging
circuit (for D4FT 780) or for faults for which there is a viable safety operating mode for the system.
The associated defect mode is a limitation of the throttle opening according to the engine speed. This results in the
speed being limited to below 66 mph (110 km/h) in 5 - th and 6 - th gear and giving the impression of a "soft"
accelerator pedal.Note:
This defect mode is an effect which occurs due to a fault, but does not necessarily originate from the throttle valve
itself.
PETROL INJECTION
Fault finding – Defect modes