sensor ACURA CSX 2006 Service Manual PDF

Throttle Body
Brake Pedal Position Switch
Electrical Power Steering (EPS) Signal
Fuel Cutoff Control
Fuel Pump Control
PGM-FI Main Relay 1 and 2
Idle Control System
Fuel Supply System
11-36Fuel and Emissions Systems
System Description (cont’d)
THROTTLE VALVE
THROTTLE POSITION
(TP) SENSOR and
THROTTLE ACTUATOR
The throttle body is a single-barrel side draft type. The
lower portion of the throttle valve is heated by engine
coolant from the cylinder head to prevent icing of the
throttle plate. When the engine is cold, the A/C compressor is on, the
transmission is in gear, the brake pedal is pressed, the
power steering load is high, or the alternator is
charging, the ECM/PCM sends signal to the throttle
position to maintain the correct idle speed.
The brake pedal position switch signals the ECM/PCM
when the brake pedal is pressed.
The EPS signals the ECM/PCM when the power steering
load is high.
During deceleration with the throttle valve closed,
current to the injectors is cut off to improve fuel
economy at engine speeds over 1,000 rpm. Fuel cutoff
control also occurs when the engine speed exceeds
6,900 rpm (K20Z3: 8,200 rpm), regardless of the
position of the throttle valve, to protect the engine from
over-revving. When the vehicle is st
opped, the ECM/
PCM cuts the fuel at engine speeds over 5,000 rpm
(K20Z3: 7,700 rpm). On a cold engine, fuel cut occurs at
a lower engine speed.
When the ignition switch is turned to ON (II), the ECM/
PCM grounds PGM-FI main relay 2 (FUEL PUMP) which
feeds current to the fuel pump for 2 seconds to
pressurize the fuel system. With the engine running, the
ECM/PCM grounds PGM-FI main relay 2 (FUEL PUMP)
and feeds current to the fuel pump. When the engine is
not running and the ignition is turned to ON (II), the
ECM/PCM cuts ground to PGM-FI main relay 2 (FUEL
PUMP) which cuts current to the fuel pump.
PGM-FI main relay 1 is energized whenever the ignition
switch is ON (II), to supply battery voltage to the ECM/
PCM, power to the injectors, and power for PGM-FI
main relay 2 (FUEL PUMP). PGM-FI main relay 2 (FUEL
PUMP) is energized to supply power to the fuel pump
for 2 seconds when the ignition switch is turned to
ON (II), and when the engine is cranking or running.
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VTEC/VTC
System Diagram
Camshaft Position (CMP) Sensor A
11-39
VTC
RETARD
CHAMBERFrom No. 3
ALTERNATOR
(10 A) FUSE
VARIOUS
SENSORS
ECM/PCM
CMP SENSOR A
INTAKE
CAMSHAFT
VTC
ADVANCE
CHAMBER ADVANCE
RETARD
VANE
VTC ACTUATOR VANE
HOUSING
From
OIL PUMP
VTC OIL CONTROL
SOLENOID VALVE
SPOOL
VALVE
ROCKER ARM
OIL CONTROL
SOLENOID ROCKER
ARM OIL
PRESSURE
SWITCH BLK
BLK GRN/YEL
BLU/BLK BLK/YEL
BLU/WHT BLU/WHT YEL
BRN/YEL
BLK
BRN/YEL
VTC STRAINERO-RING
MAGNET
TERMINAL
DRAIN
DRAIN
CMP sensor A detects camshaft angle position for the VTC system.
(cont’d)
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Exhaust Gas Recirculation (EGR) System
(K20Z2 engine)
Evaporative Emission (EVAP) Control
System
EGR Valve
EVAP Canister
EVAP Canister Purge Valve
Fuel Tank Pressure (FTP) Sensor
EVAP Canister Vent Shut Valve
11-41
TERMINAL
COIL
OUT
IN O-RING
TERMINAL
SENSOR UNIT
O-RING VALVE O-RING TERMINAL
Refer to the system diagram to see a functional layout
of the system.
The EGR valve lowers peak combustion temperatures
and reduces oxides of nitrogen emissions (NOx) by
recirculating exhaust gas through the intake manifold
and into the combustion chambers.
Refer to the system diagram to see a functional layout
of the system.
The EVAP canister temporarily stores fuel vapor from
the fuel tank until it can be purged back into the engine
and burned.
When the engine coolant temperature is below 60 °C
(140 °F), the ECM/PCM turns off the EVAP canister
purge valve which cuts vacuum to the EVAP canister. The FTP sensor converts fuel tank absolute pressure
into an electrical input to the ECM/PCM.
The EVAP canister vent shut valve is on the EVAP
canister.
The EVAP canister vent shut valve controls the venting
of the EVAP canister.
(cont’d)
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Electronic Throttle Control System Diagram
11-43
TP SENSOR A
TP SENSOR B THROTTLE
ACTUATOR
THROTTLE
BODY
From
ETCS CONTROL
RELAY
VARIOUS
SENSORS
ECM/
PCM
APP
SENSOR A
APP
SENSOR B BRN
YEL
BLU
PUR
LT BLU GRY
BLK YEL
GRN
RED/BLU BLUBLU/RED
GRN/YEL
RED/BLK
The electronic throttle control system consists of the throttle actuator, throttle position (TP) sensor A/B, accelerator
pedal position (APP) sensor A/B, the electronic throttle control system (ETCS) control relay, and the ECM/PCM.
(cont’d)
* : This illustration shows K20Z2 engine
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Î

Exhaust Gas Recirculation (EGR) System Diagram (K20Z2 engine)
11-44Fuel and Emissions Systems
System Description (cont’d)
INTAKE MANIFOLD
EGR VALVE
EGR VALVE
POSITION SENSOR
YEL/BLU
GRN/BLK
WHT/BLK
BLU/RED
BLK/RED
(BLK)
BLK
ECM/PCM
VARIOUS
SENSORS
* : ’07-09 models
*
The EGR system reduces oxides of nitrogen (NOx) emissions by recirculating exhaust gas through the EGR valve and
the intake manifold into the combustion chambers. The ECM/PCM memory includes the ideal EGR valve position for
varying operating conditions.
The EGR valve position sensor detects the amount of EGR valve lift and sends it to the ECM/PCM. The ECM/PCM then
compares it with the ideal lift in its memory (based on signals sent from other sensors). If there is any difference
between the two, the ECM/PCM cuts current to the EGR valve.
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Î

Evaporative Emission (EVAP) Control Diagram
11-45
ATMOSPHERE
ATMOSPHERE
FUEL FILL
CAP FUEL TANK VAPOR
RECIRCULATION
TUBE
FUEL TANK VAPOR
CONTROL VALVE
VARIOUS
SENSORS
FUEL TANK FTP SENSOR
EVAP CANISTER
VENT SHUT VALVE
PUR
LT GRN
ECM/PCM BLK
YEL
YEL/BLU
BLK/YEL RED
BLU BLK
LT GRN
From
No. 3
ALTERNATOR
(10 A) FUSE
From
PGM-FI
SUBRELAY
EVAP
CANISTER
EVAP CANISTER
PURGE VALVE ATMOSPHERE
The EVAP controls minimize the amount of fuel vapor escaping into the atmosphere. Vapor from the fuel tank is
temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.
The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine coolant
temperature is above 60 °C (140 °F).
(cont’d)
* : This illustration shows K20Z2 engine
08/08/21 14:13:44 61SNR030_110_0045
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ECM/PCM Circuit Diagram (K20Z2 engine)
11-46Fuel and Emissions Systems
System Description (cont’d)
YEL/BLK YEL/BLK
YEL/BLK
YEL/BLK
YEL/BLK
YEL/BLK BRN/YEL
BRN/YEL
G101 3
1 2
3
1 2
YEL
BLU RED BRN
YEL/BLK24P JUNCTION
CONNECTOR
A
BLU/YEL
GRN
C8
C6
C7C5
C31
C32 INJ4
INJ2
INJ3INJ1
CMPB
CKP 18 20
19
2423
22 21
ECM/PCM
KBLU/WHT
3
1
2
BLU/WHT BLK/YEL
BRN/YEL
C41
CMPA
AF*3
*4
5V
No. 1 INJECTOR
No. 2 INJECTOR
No. 3 INJECTOR
No. 4 INJECTOR
CMP SENSOR A
CKP SENSOR CMP SENSOR B 1
2
1
2
1
2
1
2
*3: ’06 model
*4: ’07-09 models
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11-47
C13C11
C14 YEL/RED
GRN/WHT
C23 BLU/WHT
C42
RED/BLU 1
GRN/RED
RED/BLU
C106
VTC OIL CONTROL
SOLENOID VALVE
B34
GRN/YEL
VTS
VCC1
MAP
SG1 KS
VTC BLU/WHT
2
1
BLK
G101 1
10 YEL/RED
GRN/WHT GRN/RED
D 2
3
1
BLK
GRN/YEL
2
C22 BLU/BLK
BRN/YEL1
G101
VTPSW
G101BLU/BLK
2
978
12
B C*2
*1
978 YEL/BLU3
WHT/BLK 1
GRN/BLK 2
BLU/RED 4
6
F
G101
E *1
B18 YEL/BLU
VCC2
B29
EGRP
B2
EGR
12 V
1110 BLK/RED
(BLK)*4
BRN/YEL *4
AG
24P
JUNCTION
CONNECTOR
24P
JUNCTION
CONNECTOR
24P
JUNCTION
CONNECTOR
KNOCK SENSORMAP SENSOR
ROCKER ARM
OIL PRESSURE
SWITCH ROCKER ARM
OIL CONTROL
SOLENOID
EGR VALVE EGR VALVE
POSITION
SENSOR
*1: A/T
*2: M/T
*4: ’07-09 models
(cont’d)
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µ
ECM/PCM Circuit Diagram (K20Z2 engine) (cont’d)
11-48Fuel and Emissions Systems
System Description (cont’d)
1
2
3
BLK/YEL
4
GRN/BLK
5
RED/YEL
B30
VG
RED/BLK
B32
VG BLK/BLU
G
B33
SG2 GRN/BLK
B31
IAT RED/YEL F
N *1
ECT SENSOR 1
B23
ECT1
RED/WHT GRN/BLK
RED/WHT
B36
PG1 BLK
B1
PG2 BLK/RED
(BLK)*4
C2
PGMETCS BLK
G101
3
A39
BKSWNC BRN Brake pedal pressed: closed
Brake pedal released: open
Brake pedal pressed: open
Brake pedal released: closed
4
YEL 1
WHT 2
LT GRN
SU T BRAKE PEDAL
POSITION SWITCH
LT BLU Clutch pedal pressed: open
Clutch pedal released: closed
CLUTCH PEDAL
POSITION SWITCH
A41
CRMTCLS
3 2
G401 BLK
*2 C40
LG1
BRN/YEL
C44
LG2 BRN/YEL
G101D
IJ
H
18
1920 BRN
BRN
BRN/YEL C101
AF
AG
BRN/
YEL BRN/
YEL
21
*4
*3*4 1 2
MAF
SENSOR
IAT
SENSOR
6 5
*1: A/T
*2: M/T
*3: ’06 model
*4: ’07-09 models
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ECM/PCM Circuit Diagram (K20Z2 engine) (cont’d)
11-50Fuel and Emissions Systems
System Description (cont’d)
ATF TEMPERATURE
SENSOR
N
WHT
WHT
SHIFT SOLENOID
VALVE A
BLU
SHIFT SOLENOID
VALVE B
ORN
GRN/BLK
6
SHIFT SOLENOID
VALVE C
GRN
7
5
2
1
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE A
A/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE BA/T CLUTCH PRESSURE
CONTROL SOLENOID VALVE C
INPUT SHAFT
(MAINSHAFT)
SPEED SENSOR
GRN/BLK YEL/BLU
E 1
2
1
2
1
2
BLK/RED
(BLK)*4
G101 1
2
3 SHIFT SOLENOID
VALVE D
YEL
8
SHIFT SOLENOID
VALVE E
RED
3
*1
B27RED/YEL
B10 BLU/BLK
B11 GRN/WHT
TATF
SHA SHBB20 GRN
SHC
RED/BLK
B44
BRNBLU/YEL
B35
B25
WHT/RED
B17 LSA
LSB
LSC
NMB26
GRN/RED
SHD
B24 YEL
SHE
BLK/RED
(BLK)*4BLK/RED
(BLK)*4
*1: A/T
*4: ’07-09 models
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