1995 RENAULT MEGANE SCENIC Service Repair Manual

maintenance schedule sport mode coolant reservoir lane assist wheelbase load capacity

Page 257 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Idle speed adaptive correction
17
PRINCIPLE ( K7M and F3R engines)
The E7J engine has no idle speed adaptive correction and no #12 function.
Under normal warm engine operating conditions, th

INJECTION
Idle speed adaptive correction
17
PRINCIPLE ( K7M and F3R engines)
The E7J engine has no idle speed adaptive correction and no #12 function.
Under normal warm engine operating conditions, the RCO idle speed value using #12 varies between an up-
per and a lower value to obtain the nominal idle speed.
If the engine operating conditions are different (running in, engine contaminated...) the RCO idle speed va-
lue may be situated close to the upper or lower value.
Adaptive correction (#21) for the RCO idle speed (#12) allows compensation to be made for slow variations
in the engine’s air requirements, in order to recentre the RCO value (#12) to a nominal average value.
This correction is only operational if the coolant temperature is greater than 80°C, 20 seconds after starting
the engine and if the engine is in the nominal idle speed regulation phase.
RCO IDLE SPEED VALUES AND ADAPTIVE CORRECTION
Engine
F3R 750Engine
F3R 751Engine
K7M 702Engine
K7M 703Engine
K7M 720
Nominal idle
speed (#06)X = 770 rpm. X = 770 rpm. X = 720 rpm.X = 750 rpm.
in P and NX = 720 rpm.
R.C.O. idle speed
(#12)20 %≤X≤40 % 18 %≤X≤38 % 6 %≤X≤15 %10 %≤X≤20 %
in D
6 %≤X≤15 %
in P and N4 %≤X≤14 %
Adaptive idle
speed
(#21)Threshold:
- min : - 8.6 %
- max : +6.2 %Threshold:
- min : - 8.6 %
- max : +6.2 %Threshold:
- min : - 2.4 %
- max : +6.2 %Threshold:
- min : - 2.4 %
- max : +6.2 %Threshold:
- min : - 2.4 %
- max : +6.2 %
INTERPRETATION OF THE GATE VALUES
If there is an excess of air (air leak, throttle stop incorrectly set...) the idle speed increases, the RCO idle speed
value for #12 decreases to return to the nominal idle speed; the RCO idle speed adaptive correction value for
#21 reduces to recentre the RCO idle speed for #12.
If there is a lack of air (pollution, etc.), the strategy is reversed:
The RCO idle speed for #12 increases and adaptive correction for #21 also increases, in order to recentre #12
to a nominal average value.
IMPORTANT : after erasing the computer memory (disconnecting the battery), the engine must be allowed to
run at idle speed before returning the vehicle to the customer so that the adaptive correction may correctly
reset itself. Minimum threshold for the F3R engine 750 (- 8.6 %) : this value is taken from the definitive setting. The first
versions to be marketed have a threshold of - 6.2 %.
17-33

Page 258 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual OXYGEN SENSOR VOLTAGE (#05)
Reading #05 on the XR25 : the value read is the voltage sent to the computer by the oxygen sensor; it is ex-
pressed in Volts (the value actually varies between 0 and 1 000

OXYGEN SENSOR VOLTAGE (#05)
Reading #05 on the XR25 : the value read is the voltage sent to the computer by the oxygen sensor; it is ex-
pressed in Volts (the value actually varies between 0 and 1 000 millivolts).
When the engine is in the loop phase, the voltage value should oscillate rapidly and should be between
50±50 mV (lean mixture) and 850 ± 50 mV (rich mixture) and vice versa.
The smaller the gap between the upper and lower oscillating values, the poorer the information from the
sensor (the gap is usually at least 500 mV).
RICHNESS CORRECTION (#35)
The value given under # 35 on the XR25 represents the average value of richness corrections made by the
computer depending on the richness of the burnt mixture as seen by the oxygen sensor (the oxygen sensor ac-
tually analyses the oxygen content of the exhaust gases directly from the richness of the burnt mixture).
The richness correction has a centre point of 128 with thresholds of 0 and 255 (experience has shown that un-
der normal operating conditions # 35 is located close to 128 with only a small amount of variation).
- Value less than 128 : request for mixture to be made leaner
- Value greater than 128 : request for mixture to be made richer
ENTRY INTO RICHNESS REGULATION MODE
Loop phase
Richness regulation begins after the timed starting period :
- for no load if the coolant temperature has reached:
•25°C for E7J engines,
•40°C for K7M engines,
•35°C for F3R engines.
- outside no load conditions if the coolant temperature is greater than :
•+ 20°C for K7M engines,
•+ 15°C for F3R engines,
there is no coolant temperature condition for E7J engines.
The timed starting period is dependent on the coolant temperature:
-at20°C it is a maximum of :
•45 seconds for E7J engines,
•1 minute for K7M engines,
•2 minutes for F3R engines,
-at80°C it is a maximum of :
•9 seconds for E7J engines,
•16 seconds for K7M engines,
•1 minute for F3R engines.
if richness regulation has not yet started,#35 = 128
INJECTION
Richness regulation
17
17-34

Page 259 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Richness regulation
17
Non-loop mode
When richness regulation is occurring, the operating phases when the computer ignores the voltage in-
formation from the oxygen sensor are:
- Full load:

Page 260 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Adaptive richness correction
17
PRINCIPLE
In the loop mode (see section 17 "Richness regulation"), richness regulation (# 35), corrects the injection ti-
ming to give fuel metering which is

Page 261 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Adaptive richness correction
17
Zone n° 5
(mbars)Zone n° 4
(mbars)Zone n° 3
(mbars)Zone n° 2
(mbars)Zone n° 1
(mbars)
300410500 590 680870
Average 355 Average 455 Average 545 Average 63

Page 262 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Adaptive richness correction
17
Special notes for the E7J engine
A road test should be carried out after which the engine should be allowed to idle for a few minutes. The va-
lues for #30 an

Page 263 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Operating wiring diagram
17
KEY TO OPERATIONAL WIRING DIAGRAMS (E7J, F3R, K7M)
COMPONENT NO DESCRIPTION
109
119
120
146
147
149
193 to 196
218
222
224
225
228
236
238
242
244
247
250
272
310

Page 264 of 2492

RENAULT MEGANE SCENIC 1995 Service Repair Manual INJECTION
Operating wiring diagram
17
E7J engine
PRJ99528
17-40

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