Conditions for the diagnosis
If, when the ignition is switched on and while driving, the air temperature measured by the temperature sensor is not between -7.5°C and 119°C, or if the coolant temperature. measured by the temperature sensor is not between -7.5°C and 119°C, or if the difference between the value of 1046 mbar and the pressure in the intake manifold exceeds 273 mbar (height above sea level is about 2500 m). then in this case troubleshooting by the on-board diagnostics system is not allowed until the next ignition on.
For the OBD system to function correctly, there must be no electrical problems in the injection system, even if the OBD warning light does not come on.
Oxygen sensor and catalytic converter diagnostics cannot be run at the same time.
When diagnosing the catalytic converter and the oxygen sensor, the absorber purge is stopped and the adaptive parameters are fixed at their last values.
Test procedure
Repair all electrical faults.
Erase all faults from memory.
Program all injection system settings.
Check «on-board diagnostic system».
Complete initialization of the on-board diagnostics system
Deleting faults from memory.
Deletion of faults detected by the on-board diagnostics system from memory.
Deleting programmed values.
Programming required for OBD troubleshooting
Torque and fuel programming (state: «Cylinder 1 recognition»):
Programming is carried out as follows:
- deceleration with fuel cut-off in 2nd gear at engine speeds of 2000-2400 min' for at least 3 s;
- repeated deceleration with fuel cut-off in 2nd gear at engine speeds of 3000-3500 min' for the F4P engine and 2000-2400 min' for the K4M engine for at least 2 s.
Programming adaptive correction of the composition of the working mixture
To perform this programming it is necessary to drive within the pressure ranges indicated in chapter «Adaptive correction of the composition of the working mixture».
Programming the crankshaft speed sensor signal disc
This programming requires a 25 minute drive. Programming is confirmed by the appearance of the message on the screen of the diagnostic tool: «Programming of a gear signal disk. ACTIVATED».