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
INJECTION
Computer configuration depending on gearbox type17
The screen will display :
COMPUTER CONFIGURATION DEPENDING ON GEARBOX TYPE (MANUAL GEARBOX OR AUTOMATIC
TRANSMISSION)
Each time the injection computer is replaced, it must be programmed with the type of gearbox (manual or
automatic) which is fitted in the vehicle. The computers are designed to function with either type of gearbox.
Method for configuring the computer
Connect the
XR25
Select S8
Switch on the ignition
Enter D13 then
For vehicles fitted with manual gearbox :
Enter G50* 2*
For vehicles fitted with automatic transmission :
Enter G50* 1*
if the configuration has not been made
To ensure that the computer has memorised the data correctly, switch the ignition back on , using fault fin-
ding fiche n° 27; the fault bargraph
20 LH should be extinguished, whilst the 19 LH or RH status bargraph
should be illuminated.
then if the configuration is complete
17-16
