17B-5V2 MR-376-X76-17B050$030.mif
17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
Injection computer:
The injection computer receives information from various sensors and sends control signals to various actuators
according to mappings that it has stored in the memory.
TDC sensor:
This sensor allows the computer to provide synchronisation as well as to know the position Top Dead Centre for
injection phasing.
Pinking sensor:
This sensor allows the computer to correct the ignition advance under high engine load to avoid damaging the
engine.
Refrigerant pressure sensor:
The role of the sensor is to measure the refrigerant fluid pressure in the air conditioning circuit.
Injection coolant temperature sensor:
The engine coolant temperature sensor informs the computer about the engine coolant temperature.
Injection air temperature sensor:
The air temperature sensor provides the computer with the temperature of air taken in by the engine.
Oxygen sensors:
The oxygen sensors allow the catalytic converter to correctly perform engine emission control tasks.
Accelerator potentiometer:
The potentiometer allows the computer to take into account driver requests expressed using the accelerator pedal.
Clutch pedal switch:
This switch allows the computer to convert to anti-jerking mode when the clutch pedal is depressed.
Brake light switch:
The brake light switch informs the computer of the brake pedal status.
Two gangs are used if the cruise control function exists.
Injectors:
These injectors enable rapid, precise metering of the quantity of fuel injected, with excellent injection process
repetitiveness.
PETROL INJECTION
Fault finding – Role of components
17B-10V2 MR-376-X76-17B050$050.mif
PETROL INJECTION
Fault finding – Features17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
Idle speed management
This programming is used to calculate the adapted idle speed according to the conditions of use (cold engine, air
conditioning requests, electrical consumer use etc.).
Air supply
This is managed by a motorised throttle valve which is controlled by the injection computer.
The injection computer also performs the following tasks using the motorised throttle:
– management of valve oscillations which can produce undesirable torque,
– management of valve movement subject to mechanical faults when the valve reaches its mechanical boundaries,
– management of acoustic faults by limiting throttle opening at a certain engine speed and when stopping the engine.
Torque management
The torque structure is the system for managing engine torque. It is necessary for some functions such as the
electronic stability program (ESP), automatic transmission (BVA) or sequential gearbox (BVR).
Each computer (ESP, sequential gearbox, automatic transmission) sends a request for torque via the multiplex
network to the injection computer. This arbitrates between the various torque requests and the driver's request
(made via the accelerator pedal or the cruise control/speed limiter).
The result of this arbitration gives the torque setpoint. The computer then calculates the throttle position setpoint, the
ignition advance and the wastegate setpoint (if a turbocharged engine) in order to provide the necessary torque.
Ignition management
Management of ignition advance enables the combustion quality to be managed and therefore engine operation to
be optimised. For a positive advance, the ignition point will be before TDC*, however the advance can have a
negative value.
TDC*: Top Dead Centre.
Fuel supply management
The fuel pump ensures the supply of fuel. It is activated for one second each time the + after ignition feed is switched
on. It ensures the correct level of pressure in the circuit and thereby achieves correct engine starting, particularly if
the vehicle has not been used for a long time. When the engine is running, the pump relay is controlled and
therefore the pump is always active.
The petrol vapour absorber enables petrol vapour to be collected in order to limit its release into the atmosphere.
Richness adjustment
Richness is managed using the upstream and downstream oxygen sensors located on the exhaust. For the sensors
to be operational quickly, they need to be heated by the exhaust gas and by a resistor internal to the sensor. These
sensors reflect the efficiency of combustion and, using information sent to the computer, they enable the quantity of
fuel injected to be managed in order to meet the emission control standards and to ensure optimum engine
operation.
17B-136
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V2 MR-376-X76-17B050$084.mif
PETROL INJECTION
Fault finding – Interpretation of faults17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
DF1016
PRESENT OR
STOREDCLUTCH SWITCH SIGNAL CONSISTENCY
1.DEF: Inconsistent signal.
NOTESConditions for application to a stored fault:
The fault is present with the engine idling.
Special notes:
After this fault appears:
– The cruise control and speed limiter functions are unavailable.
See the Wiring Diagrams Technical Note for Logan, Sandero, Duster, Clio II F 6.
Without action on the pedal, check that status ET803 Clutch start of travel switch is RELEASED.
If status ET803 is correct, move on to the Part 1 check.
If status ET803 is not correct: remove the clutch pedal position sensor, component code 675 and, without action
on the pedal, press sufficiently on the clutch pedal switch to seat it completely in its position.
Lock it by turning it an eighth of a turn.
Check that the fault has become stored.
If the fault does not change from present to stored, replace the clutch pedal position sensor, component code
675 (see MR 451 (Duster), MR 388 (Logan and Sandero), MR 430 (Clio II F 6), Mechanical, 37A, Mechanical
component controls, Clutch pedal: Removal - Refitting), otherwise move on to Part 1.
Part 1:
With the pedal fully depressed, check that status ET803 is DEPRESSED.
If status ET803 is correct, move on to Part 2.
If status ET803 is not correct: with the clutch pedal depressed, measure the resistance of the switch, component
code 675 between connections 86D and MAM or M.
The value must be between 0 < X 1 .
If the resistance is not correct, replace the clutch pedal position sensor, component code 675 (see MR 451
(Duster), MR 388 (Logan and Sandero), MR 430 (Clio II F 6), Mechanical, 37A, Mechanical component
controls, Clutch pedal: Removal - Refitting).
If the resistance is correct, move on to Part 2.
V42_V04_DF1016/V42_V05_DF1016/V42_V06_DF1016/V42_V14_DF1016/V42_V16_DF1016/V42_V18_DF1016
