Honda NSX-T 1998 Manual page 585

Main Menu
PGM-FI System
System Description
INPUTS
Front Primary H02S
Rear Primary HO2S
Front Secondary HO2S
Rear Secondary H02S
MAP Sensor
CKP/CYP Sensor
ECT Sensor
TP Sensor
AP Sensor
IAT Sensor
VSS
Front KS
Rear KS
EGR Valve Lift Sensor
A/TFI Signals
TCS Signals
Spark Plug Voltage
Detection Module Signal
Starter Signal
Brake Switch Signal
ALT FR Signal
Air Conditioning Signal
A/T Gear Position Switch Signal
Neutral Switch Signal (M/T)
Clutch Switch Signal (M/T)
VTEC Pressure Switch
Battery Voltage (IGN. 1)
Fuel Tank Pressure Sensor
Cruise Control Main Switch Signal
Set Switch Signal
Resume Switch Signal
PGM-FI System
The PGM-FI system on this model is a sequential multiport fuel injection system.
Fuel Injector Timing and Duration
The ECM contains memories for the basic discharge durations at various engine speeds and manifold pressures. The
basic discharge duration, after being read out from the memory, is further modified by signals sent from various sensors
to obtain the final discharge duration.
Throttle Valve Control
The ECM controls the throttle valve control motor based on accelerator pedal position, TCS control unit signals, and vari-
ous other signals. The ECM also controls the idle control function, cruise control function, and other functions with the
throttle valve control.
Ignition Timing Control
The ECM contains memories for basic ignition timing at various engine speeds and manifold pressures. Ignition timing
is also adjusted for engine coolant temperature.
A knock control system is also used. When detonation is detected by the knock sensor (KS), the ignition timing is
retarded.
Other Control Functions
1. Starting Control
When the engine is started, the ECM provides a rich mixture by increasing fuel injector duration.
2. Fuel Pump Control
When the ignition switch is initially turned on (II), the ECM supplies ground to the PGM-FI main relay that supplies
current to the fuel pump for two seconds to pressurize the fuel system.
When the engine is running, the ECM supplies ground to the PGM-FI main relay that supplies current to the fuel pump.
When the engine is not running and the ignition is on, the ECM cuts ground to the PGM-FI main relay which cuts
current to the fuel pump.
Excellent engine performance is achieved through the use of VTEC (Variable Valve Timing and Valve Lift Electronic
Control System), intake air bypass control and discharge volume control of the fuel pump.
Table of Contents
ENGINE CONTROL MODULE (ECM) OUTPUTS
Fuel Injectors
PGM-FI M.ain Relay (Fuel Pump)
Malfunction Indicator Lamp
Throttle Valve Control Motor
A/C Compressor Clutch Relay
ICM
EVAP Purge Control Solenoid Valve
EVAP Bypass Solenoid Valve
EVAP Control Canister
Vent Shut Valve
Fuel Pump Relay
EGR Control Solenoid Valve
IAB Control Solenoid Valve
VTEC Solenoid Valves
Front Primary H02S Heater
Rear Primary H02S Heater
Front Secondary H02S Heater
Rear Secondary H02S Heater
Cruise Control Indicator Light
Reverse Lockout Relay
DLC
(cont'd)