Acura 3.5 RL, Manual

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PGM-FI System
System Description
INPUTS POWERTRAIN CONTROL MODULE (PCM)
OUTPUTS
CKP/CYP Sensor Cruise Control
Signal ('04)
MAP Sensor
ECT Sensor
IAT Sensor
TP Sensor
EGR Valve Position Sensor
Left Primary HO2S
Right Primary HO2S
Secondary HO2S
VSS
BARO Sensor
Left Knock Sensor
Right Knock Sensor
TCS Signals*
VSA Signals*
1
Spark Plug Voltage Detection
Module Signal
Starter Signal
ALT FR Signal
Air Conditioning Signal
Transmission Range Switch Signal
Battery Voltage (IGN.1)
Brake Pedal Position Switch Signal
PSP Switch Signal
Immobilizer Signal
FTP Sensor
Countershaft Speed Sensor
Mainshaft Speed Sensor
Idle Air Injector Timing and Duration
Other Control Functions
Ignition Timing Control
PCM Back-up Functions
Injectors
PGM-FI Main Relay (Fuel Pump)
Fuel Pump Relay
MIL
D4 Indicator Light
IAC Valve
A/C Compressor Clutch Relay
ICM
EVAP Canister Purge Valve
Left Primary HO2S Heater
Right Primary HO2S Heater
Secondary HO2S Heater
EGR Valve Vacuum Control Valve
Pressure Regulator Vacuum
Control Solenoid Valve
IMRC Solenoid Valve 1
IMRC Solenoid Valve 2
DLC
Torque Converter Clutch Solenoid
Valve
Shift Solenoid Valve
A/T Clutch Pressure Control
Solenoid Valve
EVAP Bypass Solenoid Valve
EVAP Canister Vent Shut Valve
Engine Mount Control Solenoid
Valve
PGM-FI System
The PGM-FI system on this model is a sequential multiport fuel injection system.
Injector Timing and Duration
The PCM 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.
Idle Air Control
Idle Air Control Valve (IAC Valve)
When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is depressed, the power
steering load is high, or the alternator is charging, the PCM controls current to the IAC Valve to maintain the correct idle
speed.
Ignition Timing Control
• The PCM contains memories for basic ignition timing at various engine speeds and manifold air flow rates. Ignition
timing is also adjusted for engine coolant temperature.
• A knock control system is also used. When detonation is detected by a knock sensor, the ignition timing is retarded.
Other Control Functions
1. Starting Control
When the engine is started, the PCM provides a rich mixture by increasing injector duration.
2. Fuel Pump Control
• When the ignition switch is initially turned on, the PCM supplies ground to the PGM-FI main relay that supplies cur-
rent to the fuel pump for 2 seconds to pressurize the fuel system.
• When the engine is running, the PCM 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 PCM cuts ground to the PGM-FI main relay which cuts
current to the fuel pump.
*: with TCS
*1: with VSA
Idle Air Control
Coolant Temperature Gauge ('04)