ESA - Functions of Engine ECU
4
W
~2 Corrective
ignition advance contro
l
WARM-UP CORRECTIO
N
The ignition timing is advanced to improve
drivability when the coolant temperature is low
.
In some engine models, this correction changes
the advance angle in accordance with the intake
manifold pressure or the intake air volume
.
The ignition timing angle is advanced by
approximately 15° by this correction during
extremely cold weather
.
OVER-TEMPERATURE CORRECTIO
N
To prevent knocking and overheating, the
ignition timing is retarded when the coolant
temperature is
extremely
high
.
The ignition timing angle is retarded a maximum
of approximately 5° by this correction
.
0
-5
110*
(230)
Coolant temperature °C
('F
)
*Depending
on the engine models
.
60*
(140
)
Coolant temperature
'C ('F)
*Depending on the engine models
.
OHP 66
-RELEVANT SIGNAL
S
• Coolant temperature (THW
)
• Intake manifold pressure (PIM) or intake air
volume
(VS, KS or VG
)
REFERENCE
In some engine
models, the throttle position
(IDL) signal or the engine speed (
NE) signal is
used as the relevant signal
for this correction
.
RELEVANT SIGNAL
Coolant temperature (THW)
OHP 6
6
REFERENCE
In some engine models, the following signals
are also used for this correction
.
• Intake manifold pressure
(
PIM) signal or
intake air volume
(VS, KS or VG) signa
l
• Engine speed
(
NE) signa
l
• Thro
tt
le position (IDL) signal
etc
.
93
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