Description
ignition Timing Control:
The programmed ignition
employed in this engine provides optimum control of ignition timing by determining
the optimum timing using a microcomputer in response to engine speed and vacuum pressure in the intake manifold,
which are transmitted by signals from
sensor, throttle angle sensor, coolant temperature sensor and MAP
sensor. This system, not dependent on a governor or vacuum diaphragm, is capable of setting lead angles with compli-
cated characteristics which cannot be provided by conventional governors.
PGM-FI ECU
Battery voltage
Voltage compensation
Compensation
DIRECT
IGNITION
Current duration
SYSTEM
- - - - - - - -
MAP sensor
Thottle angle sensor
Compensation
Idling compensation
Igniter unit
I
I
I
I
I
Ignition coil
II
I
I
Spark plugs
I
Coolant temperature compensation
Coolant temperauture
sensor
Compensation at warm-up
Basic Control
Determination of ignition timing/current duration:
The control unit has stored within it the optimum basic ignition timing for operating conditions based upon engine speed
and intake manifold pressure. With compensation by signals from sensors, the system determines optimum timing for
ambient conditions and sends voltage pulses to the igniter unit.
Compensation of ignition timing:
Compensation Item
lding
Compensation at
warm-up
Related Sensor and Information
sensor
MAP sensor
Coolant temperature sensor
Coolant temperature
compensation
Coolant temperature sensor
Description
Ignition timing is controlled to the target speed
with compensation according to the idling speed.
Lag angle is adjusted in accordance with the
warming up conditions to bring about a good
balance between operating performance and
exhaust gas level.
Compensation for lead angle at low coolant
temperature and lag angle at high coolant
temperature.
Control at Start
Ignition timing is fixed at BTDC
for cranking. The cranking is detected by the CYL sensor (cranking revolution) and
starter signal.
23-89
Summary of Contents for Acura NSX 1991
Page 1: ... j s _ _ ...
Page 3: ......
Page 22: ...Special Tools Individual tool lists are located at the front of each section ...
Page 23: ...Specifications Standards and Service Limits 3 2 Design Specifications 3 l 1 ...
Page 39: ...Body Specifications m I 1 175 46 3 Unit mm in ...
Page 40: ...Maintenance Lubrication Points 4 2 Maintenance Schedule 4 4 ...
Page 42: ... 13 I 0 4 3 ...
Page 60: ...Engine Removal Installation ...
Page 81: ...lr I 6 7 ...
Page 191: ... n EilEli3 A A A Cl51 c4 BLU 1 TACHO METER CONNECTOR Cl61 C478 C488 REDlYEL YELlRED J A GlOl ...
Page 193: ... PGM FI 1 IDLE CONTROL 1 FUEL SUPPLY 1 EMISSION CONTROL II 17 ...
Page 207: ...II 31 ...
Page 211: ...I I 35 ...
Page 219: ... cont d II 43 ...
Page 235: ...1 l 59 ...
Page 255: ...11 79 ...
Page 285: ...1 l 109 ...
Page 434: ...t 14 46 ...
Page 477: ...14 95 ...
Page 482: ...Illustrated Index L Side Cover 14 100 ...
Page 484: ...Illustrated Index Transmission Housing 14 102 ...
Page 486: ...Illustrated Index Torque Converter Housing Valve Body ...
Page 527: ...3 Assemble the transmission in the following numbered sequence Replace cont dl ...
Page 551: ......
Page 698: ...9 Nom 0 9 kg m 7 lb ft REAR 9 Nom 0 9 kg m 7 lb ft ...
Page 724: ...19 37 ...
Page 766: ...19 79 ...
Page 888: ...Frame Repair Chart 20 62 ...
Page 893: ...22 5 ...
Page 937: ...22 49 ...
Page 950: ...Blower 22 62 ...
Page 971: ...22 83 ...
Page 1003: ... JND WIRE EN NE GROUND WIRE B ...
Page 1005: ... lzl A ENGINE W I R E H A R N E S S cont d 23 l 9 ...
Page 1007: ... rl p173 5 Cl34 Cl32 Ti03 23 21 ...
Page 1009: ...C2bl c262 I C203 cont d 23 23 ...
Page 1011: ... rl SUB RELAY BOX A cont d 23 25 ...
Page 1013: ...FRONT COMPAR 23 27 J ...
Page 1015: ...e RIGHT RETRACTOR SUB HARNESS I LEFT RETRACTOR SUB HARNESS I ...
Page 1019: ...C466 C465 C468 C464 c473 FLOOR WlFiE HARNESS co d 23 33 ...
Page 1021: ... ITI RETRACTABLE HEADLIGHT CONTROL UNIT i FLOOR WIRE HARNESS 23 35 ...
Page 1023: ...MAIN FUSE BOX I 23 37 ...
Page 1027: ...DRIVER S DOOR WIRE HARNESS PASSENGER S DOOR WIRE 23 41 ...
Page 1029: ...SRS CONTROL UN FUEL TANK WIRES 23 43 ...
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Page 1275: ...1 ACTUATOR ASSEMBLY SPEED SENSOR 23 l 33 ...
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