Chrysler 1991 Stealth Technical Information Manual page 162

14-26 FUEL SYSTEM - Main Muffler Control (Activ. exll.u,tl { SeIf-diagnMIl Syal...,
When the muffler mode
changeo~er
switch is on.
the engine control unit turns on the transistor in
the unit and inpl,lls a valve fully·closed command
signal (Low) to the act ive exhaust control unit
when engine rpm is in the mi ddle range
(approximately
3.500
rpm or less) and when
dri~ing
with the throttle valve not ful ly opened
(throttle position sensor output voltage;
approximately
4.5V
or less). When
a
valve fully-
closed command signal (Low) is input. the active
exhaust control unit drives the DC motor to th e
closing side to fully close the valve. When driving
SELF·DIAGNOSIS SYSTEM
The following items are bener than before.
(1)
Engine warning light (malfunction indicator
light)
(2)
Self-diagnosis
under other driving conditions, the engine control
unit inputs a valve fully-open rommand signal
(Highl to the active exha ust control unit and the
active exhaust
control
unit fully opens the valve.
When the muffler mode changeover switch is off.
th e engirJe control unit inputs a normal valve fu lly-
open command signallHigh) to the active exhaust
control unit.
Furthermore_ the engine control
unit opens and
closes the valve whenever the engine is started to
prevent the valve from sticking.
ENGINE WARNING LIGHT (MALFUNCTION INDICATOR
LI~HTI
CONTROL
The engine warning light items are as follows.
Oxyl,lOO sensor
Barometric
prtiSSlXe sensor
AirflOON sensor
(AFS)
Ignition timing adjustment si~I' <DOHC>
Inttlke air tempe rature sensor Detonation
sensor
<OOHC>
Thrmtle position sensor
Injector
El'I!lina coo!anltemperature sensor EGR <Califorrlia>
Crank angle sensor I gn~ion co i. power transistor ooit <DOHC>
TOC sensor
Engir>e
control unit
NOTE
• . Th .. engin .. w. rninQ li""t also illumin.te. when tho ign ition timing adjustmont tarminal is shOf\-circuited
during ign ition timing adjustment.