Honda Civic Service Manual page 374

PGM-FI System
System Description
CKP/TDC/CYP Sensor
MAP Sensor
IAT Sensor
TP Sensor
EGR Valve Lift Sensor*'
Primary H02S
Secondary HO2S
VSS
BARO Sensor
ELD*'
KS€
Starter Signal
ALT FR Signal
Air Conditioning Signal
A/T Gear Position Signal
Battery Voltage {lGN.1}
Erake Switch Signal
PSP Switch Signal
Fuel Tank Pressure Sensor*i
VTEC Pressure Switch*5
Clutch Switch Signal*6
Countershaft Speed SensornB
Mainshaft Speed Sensorrs
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Fuel Iniectors
PGM-Fl Main Belay {Fuel Pump)
M I L
IAC Valve
!y'C Compressor Clutch Relay
Radiator Fan Relay*,
Condenser Fan Relay
ALT*'
lcM
EVAP Purge Control Solenoid
Primary HO2S Heater
Secondary H02S Heater
EGR Control Solenoid Valve*r
EGR valve*6
EVAP Bypass Solenoid Valve*'
EVAP Control Canister Vent Shut
VTEC Solenoid Valve*5
DLC
Lock-up Control Solenoid Valve*a
Shift Control Solenoid Valve*3
Linear Solenoid Valve*3
*1: Dl6Y5 engine
*2: USA model
*3: CW (D16Y5 ensine), D16Y8 engine and 81642 ensine
*4: '96 D16Y8 engine lcoupe),'97 Dl6Y7 engine (coupe: KL model, sedan: KL (LX) model),'97 D16Y8 engine {coupe: all models, sedan: KL
model),'98-all models,'99'all models,'00-all models
+5: D16Y5, D16Y8,816A2 engine
*6: M/T (D16Y5 enginei
*7: CVT 1D'l6Y5 engine)
+8: A/T (D16Y7, D16Y8 engine)
*9: '96 D16Y5 engine,'96 D16Y7 engine,'96 Dl6Y8 engine (sedan),'97 D16Y5 engine,'97 Dl6Y7 engine (coupe: KA, KC models, sedan:
KA, KC, KL (LX) models, hatchback: all models),'97 D16Y8 engine (sedan: KA, KC modelsi
PGM-FI Sy3lem
The PGM-Fl system on this model is a sequential multipon fuel injection system.
Fuel iniector Timing and Duration
The ECM/PCM contains memories for the basic discharge durations at various engine speeds and manifold air flow rates.
The basic discharge duration, after being read out from the memory. is further modified by signals sent from various sen-
sors to obtain the final discharge duration.
ldle Air Control
ldle Air Control Valve llAC Valve)
When the engine is cold. the A,/C compressor is on, the transmission is in gear, the brake pedal is depressed, the P/S load
is high, or the alternator is charging, the ECM/PCM controls current to the IAC Valve to maintain the correct idle speed.
lgnition Timing Control
. The ECM/PCM contains memories for basic ignition timing at various engine speeds and manifold air flow rates.
lgnition timing is also adjusted for engine coolant temperature.
.
Aknockcontrol system was adopted which sets the ideal ignition timing for the octane rating ofthegasoline used.*3
Othgr Control Funqtions
1. Starting Control
When the engine is started, the ECM/PCM provides a rich mixture by increasing fuel injector duration.
2. Fuel Pump Control
.
When the ignition switch is initially turned on, the ECM/PCM supplies ground to the PGM-Fl main relay that sup-
plies current to the fuel pump for two seconds to pressurize the fuel system.
. When the engine is running, the ECI\4PCM supplies ground to the PGM-FI majn relay that supplies current to the fuel
oumo.
.
When the engine is not running and the ignition is on, the ECM/PCM cuts ground to the PGM-FI main relay which
cuts current to the fuel pump.
1 1 - 1 0 4
INPUTS
E N G I N E C O N T R O L M O D U L E ( E C M Y
POWERTRAIN CONTROL MODULE (PCM)
OUTPUTS