Control Unit; Units - Chrysler 1991 Stealth Technical Information Manual

FUEL SYSTEM - Control of Ignition Timing Current Flow Time
14-19
ENGINE/TRANSAXLE TOTAL CONTROL <DOHC-A/T>
ENGINE/TRANSAXLE TOTAL CONTROL BLOCK DIAGRAM
Tra M ..
<00'
00"
E"IIioo cootrol uoit
$po r.
0<Iv."".
control
Ba.i<
.~ or .
O<Ivanc&
+
va r""'; c"",pen .. t"'"
Pow. r
tra n.;", <>r
unit
I-1ign
T<>rque
reduction
req_ t
"iIIl13I
Torq LJO red oction OO<1troi
<uing
)
(Low: FIeque$1/High:
~w
11"0'
. I>ifting
COI1C.1)
Spork
O<Ivonce
w,.;ng
go",
.hitting
~
~A<N'nc.
mop .111"". f<>r
""!,Ii"' )
,peed. ,.,
irl"~~ "~
vol"""
The engine contrOl unit takes the map value as the
spark advance w hen shifting gears; the spar k
advance depends on eng ine rpm and the 8rnount
of intake air (engine load) for 1 cyl inder/cyc le.
There is the map for th is spark advance when
shifting gears that is gr9<lt ly retarded in relation to
the normal driving spark advance .
VVhen
shifti n~ ~ear
with an automatic transaxle.
the transaxle control unit inputs a torque reduction
request signal (Low) to the engine control unit.
When the torque redlJCtion request signal is inp ut.
the eng i ne cont rol unit carries out spa rk
When eng ine coo lant temperat ure is low
!approximatftly 60°C (140"F) or lessl. the engi ne
contro l unit inputs 8 torque reduction rejection
signa l (Low) to the transaxle control unit. During
normal driving. the engine control unit inputs a
torque redlJCtion enable signa l (50Hz High/Low) to
the transaxle control unit.
Furthermore. when a torque reduction request
T<>rque
,eduction
axacutian s ig .. 1
depending on the
spar~
advanCfl map for the gear
sh illing. The engine output torque is reduced
~
this ign it ion t iming rel<irdation and shocks during
transaxle gea r sh ifting are softened.
Furthermo re. during ignition ti ming retardation.
the engine control unit input a torq ue reduction
execution signal (H igh) to the tranS8xle control
unit.
On the othe r hand. when a torq ue reduction
cancel signal (High) is input. the engine control
unit carries out normal spark retardation control.
signal (Low) ;s cont inuous ly input for
approximately 1.5 seconds or more, the eng in e
control unit judges t hat there i$ a malfu nction in
the data commu nlcstion line and not only puts the
self-diagnosis malf unction code (No . 61) into
memory but also inputs a to rque reduction
rejection signal (Low) to the transaxle control unit