1997 RENAULT KANGOO coolant temperature

INJECTION
Adaptive idle speed correction
17
PRINCIPLE
Under normal warm engine operating conditions , the R.C.O. idle speed value at #12 varies between a
high value and a low value, until the nominal idle speed is obtained .
It is possible that during variations in the operation of the vehicle (running in, engine wear..), that the
R.C.O. idle speed value could become close to the highest or lowest values.
The adaptive correction (#21) of the
R.C.O. idle speed (#12) allows the slow variations in the engine air re-
quirement to be corrected, so that the
R.C.O. (#12) is recentred to an average nominal value.
This correction only becomes effective if the coolant temperature is higher than 75°C, 20 seconds after
starting the engine and if the nominal idle speed regulation phase has been reached.
VALUES FOR THE R.C.O. IDLE SPEED AND ITS ADAPTIVE CORRECTION
D7F 710
engineE7J 780
engine
Nominal idle speed (#06) X = 740 rpm X = 750 rpm
R.C.O. idle speed (#12) 4 %≤X≤14 % 2 %≤X≤15 %
Adaptive idle speed (#21)Limit value:
- minimum : - 4.3 %
- maximum :+3.9 %Limit value:
- minimum : - 2.4 %
- maximum :+6.2 %
INTERPRETATION OF THE GATE VALUES
In the case of excess air (air leak or throttle stop incorrectly adjusted ..) the idle speed increases, and the
R.C.O.idle speed value at #12 decreases , in order to return to the nominal idle speed; the value of the
R.C.O.idle speed adaptive correction at #21 decreases to re-centre the R.C.O. idle speed at #12.
In the case of a lack of air (contamination, etc.), the process is inverted : the
R.C.O. idle speed at #12 in-
creases and the adaptive correction at #21 also increases, in order to re-centre the #12 to an average nomi-
nal value.
IMPORTANT : It is vital, after erasing the memory from the computer (disconnecting the battery), to let the
engine run at idle speed before returning the vehicle to the customer, so that the adaptive correction can be
correctly reset.
17-19

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 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 :
•46°C for the E7J engine ,
•30°C for the D7F engine.
- outside no load conditions if the coolant temperature is greater than :
•+ 20°C for the E7J, engine
•+ 20°C for the D7F engine.
The timed starting period is dependent on the coolant temperature :
- at 20°C it is a maximum of :
•3 minutes for the E7J engine,
•1 minute 20 seconds for the D7F engine,
- at 80°C it is a maximum of :
•1 minute 30 seconds for the E7J engine,
•35 seconds for the D7F engine,
If richness regulation has not yet started, #35 = 128
INJECTION
Richness regulation
17
17-20

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)
220340470 600 730870
Average 280 Average 405 Average 535 Average 665 Average 800
260385510 635 760970
Average 320 Average 450 Average 570 Average 700 Average 865
E7J
D7F Pressure zones to cover during the test (reading #01)
Following this test the corrections will be operational.
# 31 varies more significantly for idle speed and low loads and # 30 for average and high loads, but both
are operational over all of the manifold pressure ranges.
The test should be followed by a normal, smooth and varied drive, covering a distance of 3 to 6 miles (5 to
10 km).
After the test, read the values for #30 and #31. Initially 128, they may have changed. If not, repeat the test
ensuring that the test conditions are observed.
ROAD TEST
Conditions :
- Engine warm (coolant temperature > 75° C).
- Do not exceed engine speed 4 400 rpm. for the D7F engine.
and 4 800 rpm. for the
E7J engine.
For this test , it is advisable to start from a fairly low engine speed , in 3rd or 4th gear using progressive acce-
leration to stabilise the required pressure for 10 seconds in each zone (see table).
NOTE : for the D7F engine, for example, for zone n° 1, attempt to maintain the average of 320 mbars for
at least 10 seconds.
17-23

COOLING
Diagram
19
1 Engine
2 Radiator
3 ”Hot” bottle with permanent degassing
4 Heater matrix
5 3 mm diameter restriction
The fan assembly is controlled at high speed by
the injection computer if the coolant tempera-
ture is greater than 99°C.
If the coolant temperature is lower than 96°C, the
fan assembly stops operating.Water pump
Thermostat
Bleed screw
The expansion bottle valve is brown, and its rating
is 1.2 bar.
10070-2R
D7F Engine
19-4

COOLING
Diagram
19
1 Heater
2 Radiator
3 ”Hot” bottle with permanent degassing
4 Heater matrix
5 Thermostat mounting
6 3 mm diameter restriction
The fan assembly is controlled at high speed by
the injection computer if the coolant tempera-
ture is greater than 99°C.
If the coolant temperature is lower than 96°C, the
fan assembly stops operating.Water pump
Thermostat
Bleed screw
Temperature switch
The expansion bottle valve rating is 1.2 bar
(colour:brown).
13508R
E7J Engine
19-5