ENGINE
<TURBO>
-
Control Svstem
I-83
MAIN MONITORS
L
CATALYST MONITORING
(1) Monitoring method
l
Conversion efficiency is monitored on the
FTP (Federal Test Procedure) basis.
l
Calculate a frequency ratio
(RF)
of output
signals, oscillating from lean to rich or vice
versa, from the front and rear
02
sensors
according to the following equation.
N710K40AA
(2) Malfunction criteria
If
RF
becomes larger than the predetermined
value, a catalyst malfunction is indicated.
Output signal frequency of rear
O2
sensor
RF
=
Output signal frequency of front
O2
sensor
MISFIRE MONITORING
(1) Monitoring method
Fluctuation of crankshaft speed is monitored.
(2) Malfunction criteria
If the fluctuation of the crankshaft rotation is
larger than the predetermined value, an engine
misfire is indicated.
But the determination of misfire is masked under
some conditions like rough-road driving to avoid
false diagnostic trouble codes.
(3) System figure
Damper
pul
Crank sprocket
UL-
6FU2103
To Next Page
Loading...
Need help?
General
