Page 9 of 279

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
Page 15 of 279

17B-15V2 MR-376-X76-17B050$060.mif
PETROL INJECTION
Fault finding – Replacement of components17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
OPERATIONS FOR REPLACING THE INJECTORS
– Switch on the vehicle + after ignition feed after replacing the part.
Carry out resetting using command RZ033 Richness regulation programming.
– Switch off the ignition.
A power latch is necessary to save the reset data.
– Switch on the vehicle + after ignition feed and check the values of the following parameters:
PR624 Richness regulation programming offset
PR625 Richness regulation programming gain
– Test the injectors using the following commands:
AC005 Cylinder 1 injector
AC006 Cylinder 2 injector
AC007 Cylinder 3 injector
AC008 Cylinder 4 injector.
OPERATIONS OF REPLACING THE CAMSHAFT DEPHASER SOLENOID VALVE
– Switch on the vehicle + after ignition feed.
– Reset to zero using command RZ001 Fault memory.
– Start the engine and allow the engine to idle for at least 60 seconds.
– Switch off the engine.
– Wait for the end of the power-latch phase and switch on the vehicle + after ignition.
– Check that ET845 Camshaft dephaser s.v.* programming is PERFORMED.
*s.v.: solenoid valve
Page 173 of 279
17B-173V2 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.
ET673JAMMED ACCELERATOR PEDAL
STATUS DEFINITIONYES: This status indicates that the accelerator pedal is jammed.
NO: This status indicates that the accelerator pedal is not jammed.
NOTESTo reinitialise this status, clear the fault memory by running command RZ001 Fault
memory.
Conformity check: Engine stopped, ignition on or engine running.
YESCheck that the accelerator pedal is not jammed or that there is nothing impeding its
operation (floor carpet, etc.).
Check the brake switch (see the interpretation of fault DF050 Brake switch circuit.
V42_V04_ET673/V42_V05_ET673/V42_V06_ET673/V42_V14_ET673/V42_V16_ET673/V42_V18_ET673
Page 213 of 279

17B-213V2 MR-376-X76-17B050$140.mif
17B
V42 Injection
Program No.: 2A
Vdiag No.: 04, 05, 06,
14, 16, 18
*TDC: Top Dead Centre
**GMV: fan assemblyTool
commandDiagnostic tool title Comments
RZ001 Fault memoryThis command is used to clear the faults stored in the computer.
RZ003 Engine adaptivesThis command enables a long engine start time.
RZ031 Throttle stop programmingThis command is used to reset the necessary system adaptives
if replacing the throttle valve.
RZ033Richness regulation
programmingThis command is used to reset the necessary system adaptives
if replacing the injectors.
RZ037Flywheel target
programmingThis command is used to reset the necessary system adaptives
if replacing the TDC* sensor.
RZ064Programming the level of
alcoholThis command is used to count the richness adaptive
programming necessary when replacing the injection computer.
AC005 Cylinder 1 injectorThis command is used to perform an audible check on injector 1.
AC006 Cylinder 2 injectorThis command is used to perform an audible check on injector 2.
AC007 Cylinder 3 injectorThis command is used to perform an audible check on injector 3.
AC008 Cylinder 4 injectorThis command is used to perform an audible check on injector 4.
AC015 Fuel pump relayThis command is used to check the fuel pump.
AC017Canister bleed solenoid
valveThis command is used to check the canister bleed solenoid
valve.
AC027 Motorised throttleThis command is used to check the motorised throttle.
AC038 Low speed GMV** relayThis command is used to check the low speed GMV** relay.
AC039 High speed GMV** relayThis command is used to check the high speed GMV** relay.
AC180Air conditioning
compressor relay controlThis command is used to check the air conditioning compressor
relay.
PETROL INJECTION
Fault finding – Command summary table