17B-9V2 MR-376-X76-17B050$050.mif
17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
Engine immobiliser
This Verlog 2 type immobiliser function is managed by the UCH computer and the injection computer.
Before any starting request, the injection computer is protected.
When a starting request is made, the injection computer and the Passenger Compartment Control Unit (UCH)
exchange authentication data via the multiplex network. This determines whether the engine start is authorised or
denied.
After more than five consecutive failed authentication attempts, the injection computer goes into protection (anti-
scanning) mode and no longer tries to authenticate the UCH computer. It only leaves this mode when the following
sequence of operations is carried out:
– the ignition is left on for at least 20 seconds,
– the message is switched off,
– the end of the injection computer self-feed is adhered to (the length of time varies depending on engine
temperature).
After this, one and only one authentication attempt is allowed. If this fails again, repeat the sequence of operations
described above.
If the injection computer still fails to unlock, contact the Techline.
Impact detected
If an impact has been stored by the injection computer, turn off the ignition for 10 seconds, then switch it back on to
start the engine. Clear the faults using the control RZ001 Fault memory.
ENGINE SPEED MANAGEMENT
Engine speed management is based on the following programs:
– Engine speed management when starting
– Engine speed management according to engine vibrations
– Idle speed management
– Engine speed restriction
– Engine speed management according to its status
Engine speed management when starting
This programming is used:
– To set the injection timing when starting, using the TDC (Top Dead Centre) sensor
– To calculate the amount of fuel to be injected into the cylinders to avoid flooding the engine.
Preventive correction of engine speed linked to vibrations
Programming that enables user comfort to be optimised during acceleration or deceleration which causes a harsh
change in engine torque and therefore vibration in the driveshaft. Torque management is important during these
situations.
Curative correction of engine speed linked to vibrations
This programming is used to absorb the oscillations in engine speed caused by vibration in the driveshaft.WARNING
Disconnect the injection system computer when carrying out any welding work on the vehicle.
PETROL INJECTION
Fault finding – Features
17B-179V2 MR-376-X76-17B050$110.mif
PETROL INJECTION
Fault finding – Interpretation of statuses17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
AFTER REPAIRDeal with any faults. Clear the faults from the computer memory.
Switch off the ignition and carry out a road test followed by a test with the diagnostic
tool.
ET846
CONTINUED
PROTECTED STATUS 3:
There are several possible causes, in the following order:
– check that the UCH computer has not detected a fault,
– Run fault finding on the UCH computer.
– check that the injection computer has not already been programmed with the immobiliser code for another
vehicle using the status.
– Check that the injection computer corresponds correctly to the vehicle on which fault finding is being run.
– if none of the 2 previous points is the cause, check that the injection computer is not in anti-scanning mode after
undergoing several failed authentication attempts,
– It only leaves this mode when the following sequence of operations is carried out:
1- switch off the ignition,
2- switch on the ignition again and wait for at least 20 seconds under + after ignition feed,
3- switch off the ignition and ensure that the end of the self-feed phase of the injection computer is observed (the
length of time varies depending on the engine coolant temperature and can be 10 minutes maximum),
4- switch on the ignition again and start the vehicle,
5- if the vehicle does not start, repeat this procedure 3 times,
6- if the vehicle still does not start, contact the Techline.
