Acura RSX Honda Integra. Manual — part 87
25
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Vacuum Distribution
K20A3 engine
2005-2006 models
11-54
Fuel and Emissions Systems
System Description (cont’d)
ATMOSPHERE
ATMOSPHERE
ENGINE
COOLANT
ENGINE
COOLANT
AIR FUEL RATIO (A/F) SENSOR (SENSOR 1)
SECONDARY HEATED OXYGEN SENSOR
(SECONDARY HO2S) (SENSOR 2)
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
INTAKE AIR TEMPERATURE (IAT) SENSOR
CRANKSHAFT POSITION (CKP) SENSOR
KNOCK SENSOR (KS)
CAMSHAFT POSITION (CMP) SENSOR A
CAMSHAFT POSITION (CMP) SENSOR B
IDLE AIR CONTROL (IAC) VALVE
THROTTLE BODY
INJECTOR
FUEL PULSATION DAMPER
FUEL FILTER
FUEL PRESSURE REGULATOR
FUEL PUMP
FUEL TANK
RESONATOR
AIR CLEANER
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
THREE WAY CATALYTIC CONVERTER
EVAPORATIVE EMISSION (EVAP) CANISTER
EVAPORATIVE EMISSION (EVAP) CANISTER
PURGE VALVE
EVAPORATIVE EMISSION (EVAP) CANISTER
VENT SHUT VALVE
FUEL TANK PRESSURE (FTP) SENSOR
FUEL TANK VAPOR CONTROL VALVE
FUEL TANK VAPOR RECIRCULATION VALVE
INTAKE AIR BYPASS CONTROL THERMAL VALVE
INTAKE MANIFOLD TUNING (IMT)
(INTAKE MANIFOLD RUNNER CONTROL (IMRC)) ACTUATOR
INTAKE MANIFOLD TUNING (IMT)
(INTAKE MANIFOLD RUNNER CONTROL (IMRC)) SOLENOID VALVE
INTAKE MANIFOLD TUNING (IMT)
(INTAKE MANIFOLD RUNNER CONTROL (IMRC)) CHECK VALVE
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17
*09
*10
27
PGM-FI System
Air Conditioning (A/C) Compressor Clutch Relay
Air Fuel Ratio (A/F) Sensor
Barometric Pressure (BARO) Sensor
Crankshaft Position (CKP) Sensor
Engine Coolant Temperature (ECT) Sensor
Ignition Timing Control
Injector Timing and Duration
Intake Air Temperature (IAT) Sensor
11-55
SENSOR
TERMINALS
HEATER
TERMINALS
ZIRCONIA
ELEMENT
HEATER
MAGNET
TERMINAL
THERMISTOR
TERMINAL
THERMISTOR
TERMINAL
O-RING
The Programmed Fuel Injection (PGM-FI) system is a
sequential multiport fuel injection system.
When the ECM/PCM receives a demand for cooling
from the A/C system, it delays the compressor from
being energized, and enriches the mixture to assure
smooth transition to the A/C mode.
The A/F Sensor operates over a wide air/fuel range. The
A/F Sensor is installed upstream of the TWC, and sends
signals to the ECM/PCM which varies the duration of
fuel injection accordingly.
The BARO sensor is inside the ECM/PCM. It converts
atmospheric pressure into a voltage signal that is used
by the ECM/PCM to modify the basic duration of the
fuel injection discharge.
The CKP sensor detects engine speed and is used by
the ECM/PCM to determine ignition timing and timing
for fuel injection of each cylinder as well as detecting
engine misfire.
The ECT sensor is a temperature dependent resistor
(thermistor). The resistance of the thermistor decreases
as the engine coolant temperature increases.
The ECM/PCM contains the memory for basic ignition
timing at various engine speeds and manifold absolute
pressures. It also adjusts the timing according to engine
coolant temperature.
The ECM/PCM contains the memory for basic discharge
duration 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.
By monitoring long term fuel trim, the ECM/PCM
detects long term malfunctions in the fuel system and
sets a diagnostic trouble code (DTC).
The IAT sensor is a temperature dependent resistor
(thermistor). The resistance of the thermistor decreases
as the intake air temperature increases.
(cont’d)
05/06/27 17:32:00 61S6M040_110_0055
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28
*11
13
Knock Sensor (KS)
Malfunction Indicator Lamp (MIL) Indication (In relation
to Readiness Codes)
Manifold Absolute Pressure (MAP) Sensor
Secondary Heated Oxygen Sensor (Secondary HO2S)
Starting Control
11-56
Fuel and Emissions Systems
System Description (cont’d)
TERMINAL
PIEZO
CERAMIC
ELEMENT
SENSOR UNIT
TERMINAL
O-RING
ZIRCONIA
ELEMENT
HEATER
TERMINALS
SENSOR
TERMINALS
HEATER
The knock control system adjusts the ignition timing to
minimize knock.
The vehicle has certain ‘‘readiness codes’’ that are part
of the on-board diagnostics for the emissions systems.
If the vehicle’s battery has been disconnected or gone
dead, if the DTCs have been cleared, or if the ECM/PCM
has been reset, these codes are reset. In some states,
part of the emissions testing is to make sure these
codes are complete. If all of them are not set to
complete, the vehicle may fail the test, or the test
cannot be finished.
To check if the readiness codes are set to complete,
turn the ignition switch ON (II), but do not start the
engine. The MIL will come on for 15
20 seconds. If it
then goes off, the readiness codes are complete. If it
flashes five times, one or more readiness codes are not
complete. To set each code, drive the vehicle or run the
engine as described in the procedures (see page 11-90).
The MAP sensor converts manifold absolute pressure
into electrical signals to the ECM/PCM.
The secondary HO2S detects the oxygen content in the
exhaust gas downstream of the Three Way Catalytic
Converter (TWC), and sends signals to the ECM/PCM
which varies the duration of fuel injection accordingly.
To stabilize its output, the sensor has an internal heater.
The ECM/PCM compares the HO2S output with the A/F
sensor output to determine catalyst efficiency. The
secondary HO2S is located on the TWC.
When the engine is started, the ECM/PCM provides a
rich mixture by increasing injector duration.
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*12
14
30
31
Throttle Position (TP) Sensor
Camshaft Position (CMP) Sensor B
Vehicle Speed Sensor (VSS) (2002-2004 M/T models)
Input Shaft (Mainshaft) Speed Sensor
Output Shaft (Countershaft) Speed Sensor (2005-2006
M/T models)
11-57
ELEMENT
BRUSH HOLDER
BRUSH
TERMINAL
O-RING
MAGNET
TERMINAL
MAGNET
O-RING
TERMINAL
MAGNET
O-RING
TERMINAL
The TP sensor is a potentiometer connected to the
throttle valve shaft. As the throttle position changes, the
sensor varies the signal voltage to the ECM/PCM. The
TP sensor is not replaceable apart from the throttle
body.
CMP sensor B detects the position of the No. 1 cylinder
as a reference for sequential fuel injection to each
cylinder.
The VSS is driven by the differential. It generates a
pulsed signal from an input of 5 volts. The number of
pulses per minute increases/decreases with the speed
of the vehicle.
This sensor detects mainshaft speed.
This sensor detects output shaft (countershaft) speed.
(cont’d)
05/06/27 17:32:01 61S6M040_110_0057
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