17B
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32
PETROL INJECTION
Conditions for carrying out fault finding (when driving)
L90, and K7J, and 710 – L90, and K7M, and 710
17B
FOR VEHICLES FITTED WITH O.B.D:
I -FAULT FINDING CONDITIONS
If, when the ignition if switched on and the engine stop-
ped, the air temperature detected by the temperature
sensor is not within - 6 ˚C to 119 ˚C, or if the water tem-
perature detected by the sensor is not within - 6 ˚C to
119 ˚C, or if the atmospheric pressure is less than 775
mbar (altitude of about 2,500 m), then O.B.D. fault fin-
ding is not authorised until the next time the ignition is
switched on.
For the On Board Diagnostic system to function cor-
rectly, there must be no electrical faults in the injection
system, even if the OBD warning light does not come
on.
Catalytic converter and oxygen sensor fault finding can
only be carried out consecutively.
When the catalytic converter or oxygen sensor fault fin-
ding procedures are in progress, the canister bleed is
closed and the richness adaptives are locked at their
last value.
II - TEST PROCEDURE
- Rectify the electrical faults.
- Erase all faults.
- Carry out all injection programming (if necessary).
III - COMPLETE O.B.D. INITIALISATION BY
COMMAND MODE
- Clearing the fault memory.
- Erasing programming (for work on a component which
could have disturbed the programming: idle speed re-
gulation valve, flywheel target, etc.)
IV - PROGRAMMING REQUIRED FOR OBD FAULT
FINDING
1 - Torque Gas Programming (State: ET014 cylinder
1 recognition = DONE, engine running)
This is programmed by:
- a deceleration with injection cut-off in second, third,
fourth or fifth gear between 3,000 and 3,000 rpm for
at least 2 seconds,
- a second deceleration with injection cut-off in second,
third, fourth or fifth gear between 2,400 and 2,000 rpm
for at least 3 seconds.
2 - Programming of richness adaptive parameters
To carry out this programming, run the vehicle by res-
pecting the pressure ranges laid down in section: "In-
jection: Adaptive richness correction".
State ET202: OBD fault finding, misfirings included,
should be ACTIVE.
