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A3.18
Checking exhaust emissions
Exhaust gas analysis
TEST DRIVE (details of procedure):
Preferably test drive the vehicle after it has been left unused overnight. The difference between the engine
temperature and ambient temperature on starting must be between 3°C and 37.5°C, and the fuel level
must be between 15% and 85%.
Self-adaptive parameters must be reset (simply cancel errors to reset).
TEST DRIVE procedure:
With the engine cold, start the engine and leave to idle for 4 minutes without accelerating.
Drive the vehicle normally for approximately 6 Km at constant speed, in 3rd or 4th gear with an engine
speed between 2,000 and 2,500 rpm, and without accelerating suddenly or changing gear too
frequently.
Accelerate gradually to 6,000 rpm, then slow to an engine speed of 2,000 rpm. Repeat eight times.
Stop the vehicle, leave the engine idling for 5 minutes, then switch off the engine.
Wait at least 15 minutes.
Start the engine and drive the vehicle normally for at least 20 minutes with accelerating suddenly or
changing gear too frequently.
EXHAUST GAS ANALYSIS (details of procedure)
Connect the DEIS tester to the diagnostic socket (
Perform the cycle "170 NCM Exhaust gas test" with the DEIS Diagnostic Tester.
F2.10).
Perform test at the outlet ports of the cylinder
head in the following conditions: engine
temperature above 90°C, engine at idle
speed and A/C system ON.
Check CO, HC, CO2 and O2 levels by
connecting the tester to the unions on the
connector pipes for the exhaust manifold,
after removing the two nuts (1).
After completing the procedure, tighten the two
nuts (1).
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