2010 RENAULT SCENIC pr144

PETROL INJECTION
Fault finding - System operation
17B
17B - 11
PETROL INJECTION
Fault finding - System operation
17B
17B - 11V9 MR-372-J84-17B050$094.mif
S3000 Injection
Program No.: AD
Vdiag No.: 4C / 54
Adaptive idling speed correction:
Under normal warm operating conditions, the idling speed opening cycle ratio value PR091 Idling speed regulation
theoretical OCR varies between a high value and a low value to obtain the nominal idling speed.
After operating dispersion (running in, engine fouling, etc.), the opening cycle ratio value may be close to the high or
low values.
The adaptive correction PR090 Idling speed regulation programming value on the idling speed opening cycle
ratio compensates for the gradual variations in the engine's air requirement, by bringing the idling speed opening
cycle ratio back to an average nominal value.
This adjustment only takes effect if the coolant temperature is above 75 °C, 1 minute after starting the engine and
during the idle speed regulation phase.
Idling speed setpoint calculation:
The idling speed setpoint is given by parameter PR010 Idle speed regulation valve setpoint.
The idling speed regulation setpoint depends on the coolant temperature, the depollution programming, the climate
control requirements, the position of the gearbox selector, any power assisted steering action, the passenger
compartment heating resistors, the oil temperature (engine protection) and the electricity balance calculated by the
injection software (the engine speed is increased by 160 rpm maximum if the battery voltage remains below 12.7 V).
Richness management
For optimal operation of the catalytic converter, the richness must be maintained around 1.
Richness regulation is controlled by the upstream sensor. The sensor gives voltage according to the difference
between the partial oxygen pressures contained in the exhaust and a cavity filled with a reference mixture
(atmosphere).
As the partial oxygen pressure in the exhaust is representative of the richness, the voltage supplied to the computer
represents a Rich - Lean signal.
Adaptive richness correction:
In loop mode, the richness regulation corrects the injection duration in order to obtain a mixture which is as close as
possible to a richness of 1. The richness correction value PR138 Richness correction is close to 50 %, with limits
of 0 and 100 %.
The richness adaptive corrections PR143 Self-adapting richness gain and PR144 Self-adapting richness offset
are used to offset the injection mapping to centre richness regulation on 50 %.
Adaptive corrections take 50 % as an average value after computer initialisation (clearing the programming) and have
the following limit values:

PETROL INJECTION
Fault finding - Conformity check
17B
17B-125
PETROL INJECTION
Fault finding - Conformity check
17B
17B-125V9 MR-372-J84-17B050$470.mif
S3000 Injection
Program No.: AD
Vdiag No.: 4C / 54
FUEL CIRCUIT SUB-FUNCTION (continued 2):
NOTESOnly check the conformity after a complete check with the diagnostic tool. The values
shown in this conformity check are given as a guide.
Application conditions: Engine off, ignition on.
Order FunctionParameter or Status Checked
or ActionDisplay and notes Fault finding
6
RichnessPR138:Richness correctionIn loop mode, the
richness correction
corrects the injection
duration to obtain a
fuel mixture as close
as possible to a
richness of 1. The
richness correction
value varies around
50 between 0 and
100.
0 7 ET300:Richness regulationINACTIVE WITHOUT
8ET056:Richness double loopINACTIVEIn the event of a fault,
apply the
interpretation of
ET056 Double
richness loop.
9
Oxygen sensorPR144:Self-adapting
richness offset0 This parameter is
used to detect any
tendency of the
injection system to
increase or decrease
the richness.
WITHOUT
10 PR143:Self-adapting
richness gain0 This parameter is
used to detect any
tendency of the
injection system to
increase or decrease
the richness.
11 Injection PR101:Duration of injection0µs
12Fuel
consumption.PR103:Instantaneous fuel
consumptionPR103 = 0 l/h

PETROL INJECTION
Fault finding - Conformity check
17B
17B-149
PETROL INJECTION
Fault finding - Conformity check
17B
17B-149V9 MR-372-J84-17B050$517.mif
S3000 Injection
Program No.: AD
Vdiag No.: 4C / 54
FUEL CIRCUIT SUB-FUNCTION (continued 2):
NOTESOnly perform this conformity check after a complete check with the diagnostic tool.
The values shown in this conformity check are given as a guide.
Application conditions: Engine warm, idling.
Order FunctionParameter or Status Checked
or ActionDisplay and notes Fault finding
7
RichnessPR138:Richness correctionIn loop mode, the
richness correction
corrects the injection
duration to obtain a
fuel mixture as close
as possible to a
richness of 1. The
richness correction
value varies around
50 between 0 and
100.
0 8ET300:Richness regulationACTIVE
INACTIVEWITHOUT
9ET056:Richness double loopACTIVEIn the event of a fault,
apply the
interpretation of
ET056 Double
richness loop.
10
RichnessPR144:Self-adapting
richness offsetPR624≈ 128
This parameter is
used to detect any
tendency of the
injection system to
increase or decrease
the richness.
WITHOUT
11 PR143:Self-adapting
richness gainPR625≈ 128
This parameter is
used to detect any
tendency of the
injection system to
increase or decrease
the richness.
12 Injection PR101:Duration of injectionIdling
2.4 µs < PR101
<4.3µs
13Fuel
consumption.PR103:Instantaneous fuel
consumption0 l/h < PR103 < 50 l/h

PETROL INJECTION
Fault finding - Parameter summary table
17B
17B - 203
17B
17B - 203V9 MR-372-J84-17B050$658.mif
S3000 Injection
Program No.: AD
Vdiag No.: 4C / 54
* OCR: Opening Cycle Ratio
* SV: Solenoid valveTool parameter Diagnostic tool title
PR118Measured throttle position gang 1
PR119Measured throttle position gang 2
PR125Power absorbed by the air conditioning compressor
PR126Advance after anti-pinking correction
PR138Richness correction
PR143Self-adapting richness gain
PR144Self-adapting richness offset
PR147Pedal potentiometer voltage gang 1
PR148Pedal potentiometer voltage gang 2
PR312Inlet manifold vacuum
PR424Programming the no-load position value
PR427Average pinking signal
PR429Measured throttle position
PR448Ignition advance
PR499Pedal no load programming
PR538Measured throttle voltage, gang 2
PR539Measured throttle voltage, gang 1
PR568Pedal position gang 1
PR569Pedal position gang 2
PR588Motorised throttle lower stop gang 2
PR589Motorised throttle upper stop gang 1
PR590Motorised throttle upper stop gang 2
PR593Motorised throttle in safe mode gang 1
PR594Motorised throttle in safe mode gang 2
PR597Motorised throttle in safe mode
PR745Camshaft dephaser position setpoint
PR846Turbocharging SV* OCR*
PR876Camshaft dephaser solenoid valve control OCR*