1997 RENAULT KANGOO ignition

DIESEL EQUIPMENT
Location of components
13
20 EGR valve
13047-1R
7Engine speed sensor
13048R
87970R
17Diesel injection fault warning light
18Preheating warning light
Warning light illuminates when ignition is
switched on during preheating phase.
12839S
C Power assisted steering pump assembly relay
HAltimetric corrector relay
LInjection locking relay
MDiesel heating relay
13-18

DIESEL EQUIPMENT
Load potentiometer
13
In the factory, vehicles are programmed with the full load position. (memorising the voltage delivered by the
potentiometer in the full load position). This value is used to adjust the load potentiometer after it has been
replaced. It is therefore essential, if the diesel injection computer has to be replaced during the vehicle’s li-
fetime , to carry out this programming (G31*).
If it is necessary to replace the load potentiometer, in order to adjust it we compare the voltage delivered by
the potentiometer in full load position, with the value memorised. The new potentiometer is said to be cor-
rectly adjusted when the two voltages are equal. This is displayed on the
XR25. G32* indicates the diffe-
rence in voltage between the value memorised and the one from the potentiometer. The adjustment is cor-
rect if this value is equal to 0 in the full load position.
The potentiometer and the computer cannot be replaced at the same time (if necessary, replace the poten-
tiometer first and then the computer).
REPLACEMENT OF THE LOAD POTENTIOMETER (operation to be carried out by two people)
Remove the three terminals for the load potentiometer from the 10 track pump connector (see method
described in section 13 "Advance solenoid valve").
Remove the two bolts mounting the faulty potentiometer, extract this, and fit the new potentiometer .
Hand tighten the two bolts mounting the potentiometer but do not lock them - it should be possible to turn
the potentiometer body .
Connect the
XR25, and switch on the ignition.
Set the selector to S8.
Enter code
Press down on the accelerator pedal (full load position). Do not act directly on the load lever.
Holding the full load position, turn the potentiometer body until the value 0 appears on the XR25 display (if
you are too far from the 0 value, the screen will display HL , which means "Hors Limite"= "Off limits". Just
to turn the potentiometer body to obtain the display of a decimal value).
Tighten the two bolts mounting the potentiometer in the full load position, when the value read is 0. D
34then
G32*
13-28

DIESEL EQUIPMENT
Computer configuration
13
PROGRAMMING THE FULL LOAD POSITION
Switch the ignition off.
Replace the computer.
Carry out the programming of the full load position; in order to do this :
Switch the ignition on.
Connect the
XR25.
Set the selector to S8.
Enter code
Enter code
When the display flashes "PF", press the accelerator pedal down as far as it will go.
The programming is complete when
the screen displays the following
wording: D
34
G31*
Bargraph N.12 on the right hand side should now be extinguished.
Switch the ignition off.
DPCN LUCAS injection computers are configured before sale to "with air conditioning". If the vehicle is not
fitted with an air conditioning system, use command G50*4* on the
XR25 to carry out the "no air conditio-
ning " programming.
DPCN LUCAS "injection computers are configured before sale to "with power assisted steering " (power as-
sisted steering with pump assembly). If the vehicle is not fitted with a power assisted steering pump as-
sembly, use command G50*9* on the
XR25 to carry out the "no power assisted steering pump assembly"
programming.then
13-29

DIESEL EQUIPMENT
Injection warning light
13
OPERATING PRINCIPLE OF THE DIESEL INJECTION WARNING LIGHT ON THE INSTRUMENT PANEL
On switching on the ignition, the diesel injection fault warning light is illuminated. It extinguishes as the en-
gine begins to run.
•Fault in a component of the injection assembly
Faults in the following components may cause the warning light to illuminate :
- injector with sensor
- advance solenoid valve,
- engine speed sensor ,
- load lever potentiometer,
- pre-postheating (according to version).
13-32

DIESEL EQUIPMENT
Pre-postheating control
13
The pre-postheating function is controlled by the
computer, which controls the preheating plug re-
lay housing.
1) Ignition - Preheating
The preheating process is divided in two
phases :
a) Variable preheating
This is dependent on the coolant tempera-
ture, on the battery voltage and on alti-
tude (internal computer sensor) when the
ignition is switched on (the preheating
warning light illuminates).b) Fixed preheating
After the preheating warning light has
extinguished (variable preheating), the
plugs remain fed for 8 seconds before the
engine is started.
2) Starting the engine
During the action of the starter motor, the
four plugs are fed continuously.
3) Engine running - Postheating
The postheating also may be divided in two
phases:
a) Fixed postheating
After starting the engine, the plugs are
supplied simultaneously for a period of 10
seconds.
b) Variable postheating
Variable postheating begins when fixed
postheating ends. The time during which
the plugs are fed (continuously) depends
upon :
- the coolant temperature
- the engine speed ,
- the load (load potentiometer on pump
lever ).
Maximum preheating limit (battery vol-
tage lower than 9.3 volts and altitude hi-
gher than 2 000 m).
Minimum preheating limit (battery
voltage greater than 10.5 volts altitude
lower than 350 m).
13041S
13-33

DIESEL EQUIPMENT
Fast idle speed control
13
- if the engine speed falls to 650 rpm and the
vehicle speed is lower than 15 mph (25 km/h)
(engine start improvement programming).
The fast idle speed is cut off once the speed
becomes > 850 rpm
NOTE :
- Fast idle speed operational :
• solenoid valve not operated,
• cable loose, and not tensioned.
- Nominal idle sped :
• solenoid valve operated
• cable tensioned
SPECIAL FEATURES : once the AC has been
selected on the instrument panel, the fast idle
speed function is activated. The fast idle speed function is controlled by the
computer via a solenoid valve operating the dia-
phragm (versions with or without air conditio-
ning).
The fast idle speed control becomes operational :
- if, on switching on the ignition, the coolant
temperature is below 10°C,
Coolant
temperature
on switching
ignition on (°C)Fast idle speed
cut-off
temperature
(°C) Fast idle speed
cut-off
temperature
(°C)
10
5
0
- 10
- 2020
20
30
40
5011
15
20
25
30
F8Q 662F8Q 630
13-35

DIESEL EQUIPMENT
Defect modes
13
If there is a fault with one of the components listed below, the computer enters "defect mode", which means
that replacement values are used to ensure engine operation.
Faulty
componentSet values (for replacement)
Advance
corrector Pre-postheating
timeEGR function Fast idle speed AC function
Coolant sensorRunning time
functionPreheating : -
30°C
Postheating :
80°CCutRunning time
function-
Air sensorTemperature
= 22°C- Cut - -
Load
potentiometer100 % load lever
positionPostheating:
30 % load lever
position Cut - 20 % load lever
position
Altitude sensorAltitude
= 900 mAltitude
= 900 mCut - -
Battery
16 V < U < 6 VUbatt = 13.5V Not controlled - - -
TDC sensorMinimum
advance
Solenoid valve
fully open
position Postheating :
Not controlled
until ignition is
switched off
then on againCutSpeed
= 2 000 rpmSpeed
= 2 000 rpm
Needle lift
sensorDefect mode
advance
(Carto soft
F8Q 662)
Maximum
advance
(F8Q 630)----
Vehicle speed
sensor--Position :
V = 175 km/hPosition :
V = 175 km/hPosition :
V = 175 km/h
Heater plugs
relay housing- Cut - - -
13-38

ANTIPOLLUTION
Fuel vapour rebreathing
14
CHECKING CANISTER BLEED OPERATION
Incorrect operation of the system may cause the
idle speed to be unstable or the engine to stall.
Check the conformity of the circuit (see
operational diagrams)
Be sure to check that the pipe marked "CAN" on
the solenoid valve is correctly connected to the
canister.
Check the condition of the pipes to the fuel tank.
97393R6
1Inlet manifold
2Canister bleed solenoid valve
3Canister
4Fuel tankAt idle speed connect a pressure gauge
(- 3 ; +3 bars) (Mot. 1311-01) to the "CAN" outlet
on the solenoid valve, to check there is no vacuum
(the command value read by the
XR25 for #23 re-
mains minimal X = 0.7 % ). Is there a vacuum ?
YESIgnition off, use a vacuum pump to apply a
vacuum of 500 mbars to the solenoid valve
at (C). This should not vary by more than 10
mbars in 30 seconds.
Does the pressure vary?
YESThe solenoid valve is faulty. Renew it. Air
must be blown into the pipe (A) connecting
the solenoid valve to the canister to remove
any particles of active carbon.
NOThere is an electrical fault. Check the circuit.
NOUnder bleeding conditions (not at idle
speed, engine warm), the vacuum should
increase (the value for #23 on the XR25
should also be seen to increase).
14-5