vent ACURA CSX 2006 Service Owner's Guide

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ECM/PCM Inputs and Outputs at Connector A ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-25
NOTE: Standard battery voltage is about 12 V.
4 PUR FANL (RADIATOR FAN CONTROL) Drives radiator fan relay With radiator fan running: about 0 V
With radiator fan stopped: battery voltage
5 GRY FANH (RADIATOR FAN CONTROL) Drives A/C condenser fan
relayWith A/C condenser fan running: about 0 V
With A/C condenser fan stopped: battery voltage
6 GRN MRLY (PGM-FI MAIN RELAY 1) Drives PGM-FI main relay 1
Power source for DTC
memoryWith ignition switch ON (II): about 0 V
With ignition switch OFF: battery voltage
8 ORN IGP (POWER SOURCE) Power source for ECM/PCM circuitWith ignition switch ON (II): battery voltage
9 BLK SG6 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
10 LT GRN VSV (EVAPORATIVE EMISSION (EVAP)
CANISTER VENT SHUT
VALVE) Drives EVAP canister vent
shut valve
With ignition switch ON (II): battery voltage
14 RED ACC (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor
clutch relayWith compressor ON: about 0 V
With compressor OFF: battery voltage
15 BRN IMOFPR (IMMOBILIZER FUEL PUMP RELAY) Drives PGM-FI main relay 2
(FUEL PUMP)About 0 V for 2 seconds after turning ignition switch
ON (II), then battery voltage
16 LT GRN ACPD (A/C PRESSURE SENSOR) Detects A/C pressure
sensor signalWith A/C switch ON: about 1.7 4.8 V
(depending on A/C pressure)
17 YEL APSA (ACCELERATOR PEDAL POSITION (APP)
SENSOR A) Detects APP sensor A signal With ignition switch ON (II) and accelerator pedal
pressed: about 4.7 V
With ignition switch ON (II) and accelerator pedal
released: about 0.5 V
18 PUR APSB (ACCELERATOR PEDAL POSITION (APP)
SENSOR B) Detects APP sensor B signal With ignition switch ON (II) and accelerator pedal
pressed: about 2.3 V
With ignition switch ON (II) and accelerator pedal
released: about 0.25 V
19 RED VCC6 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
20 YEL ETCSRLY (ELECTRONIC THROTTLE CONTROL
SYSTEM (ETCS) CONTROL
RELAY) Drives electronic throttle
control system (ETCS)
control relay
With ignition switch ON (II): about 0 V
(4.0 V momentarily)
21 PNK SUBRLY (PGM-FI SUBRELAY) Drives PGM-FI subrelay With ignition switch ON (II): about 0 V
23 ORN ELD (ELECTRICAL LOAD DETECTOR (ELD)) Detects ELD signal With ignition switch ON (II): about 0.1 4.8 V
(depending on electrical load)
(cont’d)
Terminal side of female terminals
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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.
08/08/21 14:13:39 61SNR030_110_0036
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Intake Air System
Catalytic Converter System
Positive Crankcase Ventilation (PCV) System
Intake Air Bypass Control Thermal Valve Three Way Catalytic Converter (TWC)
11-40Fuel and Emissions Systems
System Description (cont’d)
OUT
INVALVE
WAX
ELEMENT
INJECTOR INTAKE AIR
BYPASS CONTROL
THERMAL VALVE FRONT OF
VEHICLE
HOUSING
THREE WAY
CATALYST BREATHER PIPE
INTAKE
MANIFOLD
PCV HOSE PCV VALVE
:BLOW-BYVAPOR
:FRESHAIR
This system supplies air for engine needs.
When the engine is cold, the intake air bypass control
thermal valve sends air to the injector.
The amount of air is regulated by engine coolant
temperature. Once the engine is hot, the intake air
bypass control thermal valve closes, stopping air to the
injector. The TWC converts hydrocarbons (HC), carbon
monoxide (CO), and oxides of nitrogen (NOx) in the
exhaust gas to carbon dioxide (CO ), nitrogen (N ), and
water vapor.
The PCV valve prevents blow-by gasses from escaping
into the atmosphere by venting them into the intake
manifold.
22
* : This illustration shows K20Z2 engine
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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)
08/08/21 14:13:42 61SNR030_110_0041
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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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Î
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11-53
1
A33
ECT2
2
A9
SG6 GRN
BLK
A/C PRESSURE
SENSOR
1
A19
VCC6
2
A16
ACPD LT GRN
3
BLK
1
2
A26
FTP
3
BLK
1
A10
VSV LT GRN
LT GRNEVAP CANISTER
VENT SHUT VALVE
2
PUR
A28
NEP BLU
To
EPS CONTROL UNIT
12
9
10
11
8
RED
BLK
PUR C204
Q
BLULT GRN
A27
SLS PNK
13
B16
SUPP
B40 SDNP BRN C201
VYEL
PNK
2
1
2
1
2 1
BLU/YEL AH
RED
*1 LT GRN
17
BLU
GRN BLU
BLK
G504 16
16
1717
7
6 GRN/ORN
BLK/WHT
LT GRN
GRN
C202
CABLE REEL
C103
2
1 2
1 ECT SENSOR 2
FTP SENSOR
SHIFTLOCK
SOLENOID
PADDLE
SHIFTER
(UPSHIFT
SWITCH)
PADDLE
SHIFTER
(DOWNSHIFT
SWITCH)
RED BLK
*1: A/T
(cont’d)
08/08/21 14:13:49 61SNR030_110_0053
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ÎECM Circuit Diagram (K20Z3 engine) (cont’d)
11-64Fuel and Emissions Systems
System Description (cont’d)
ECT SENSOR 2
1
A33
ECT2
2
A9
SG6 GRN
BLK
A/C PRESSURE
SENSOR
1
A19
VCC6 RED
2
A16
ACPD LT GRN
3
BLK
1
FTP SENSOR
2
A26
FTP
3
BLK
1
A10
VSV LT GRN
LT GRN
EVAP CANISTER
VENT SHUT VALVE
2
PUR
A28
NEP BLU
To
EPS CONTROL UNIT
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 12
9
10
11 8
RED
BLK
PUR C204
O Q
P BRAKE PEDAL
POSITION SWITCH
N
LT BLU Clutch pedal pressed: open
Clutch pedal released: closed
CLUTCH PEDAL
POSITION SWITCH
A41
CRMTCLS L
BLK 3 2
G401 BLU
LT GRN
LT GRN RED BLK
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Î
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µ
µ µ
µ
µ
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YES
NO YES
NO
YES
NO
11-103
E
A/F SENSOR (SENSOR 1) 4P CONNECTOR B(PUR)
20. Remove the PGM-FI subrelay (E) from the under-hood fuse/relay box.
21. Disconnect the A/F sensor (Sensor 1) 4P connector.
22. Disconnect the EVAP canister vent shut valve 2P connector.
23. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.
Repair short in the wire between the PGM-FI
subrelay, the EVAP canister vent shut valve, and
the A/F sensor (Sensor 1). Also replace the No. 11
FISUB(15A)fuse,thengotostep25.
Replace the under-hood fuse/relay box
(see page 22-65), then go to step 25. 24. Replace the A/F sensor (Sensor 1) (see page
11-221).
25. Reconnect all connectors.
26. Turn the ignition switch to ON (II).
27. Reset the ECM/PCM with the HDS.
28. Do the ECM/PCM idle learn procedure (see page 11-310).
29. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the A/F sensor (Sensor 1), the PGM-FI
subrelay, and the ECM/PCM, then go to step 1.
Go to step 30.
30. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 29,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the A/F sensor
(Sensor 1), the PGM-FI subrelay, and the ECM/PCM,
then go to step 1. If the screen indicates NOT
COMPLETED, keep idling until a result comes on.
(cont’d)
Terminal side of male terminals
Is there continuity? Is DT C P0135 ind icated ?
Does t he scr een i nd i cat e PASSE D?
08/08/21 14:17:21 61SNR030_110_0103
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Ì
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Special Tools Required
11-227
ECM/PCM Update
A
 Honda diagnostic system (HDS) tablet tester
 Honda interface module (HIM) and an iN workstation
with the latest HDS software version
 HDS pocket tester
 GNA 600 and iN workstation with the latest HDS software version
Any one of the above updating tools can be used.
NOTE:  Make sure the HDS/iN workstation has the latest HDS software version.
 Before you update the ECM/PCM, make sure the battery in the vehicle is fully charged, and connect a
jumper battery (not a battery charger) to maintain
system voltage.
 Never turn the ignition switch to LOCK (0) or ACC (I) during the update. If there is a problem with the
update, l eave the ignition switch to ON (II).
 To prevent ECM/PCM damage, do not operate anything electrical (headlights, audio system, brakes,
A/C, power windows, moonroof (if equipped), door
locks, etc.) during the update.
 To ensure the latest program is installed, do an ECM/ PCM update when ever the ECM/PCM is substituted or
replaced.
 You cannot update an ECM/PCM with a program it already has. It will only accept a new program.
 High temperature in the engine compartment might cause the ECM/PCM to become too hot to run the
update. If the engine was running before this
procedure, open the hood, and cool the engine
compartment.
 If you need to diagnose the Honda interface module (HIM) because the HIM’s red ( 3) light came on or
was flashing during the update, l eave the ignition
switch in ON (II) when you disconnect the HIM from
the data link connector (DLC). This will pr event ECM/
PCM damage. 1. Turn the ignition switch to ON (II), but do not start
the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
3. Make sure the HDS communicates with the ECM/ PCM. If it doesn’t, go to the DLC circuit
troubleshooting (see page 11-204). If you are
returning from the DLC circuit troubleshooting, skip
steps 4 to 5 and clean the throttle body after
updating the ECM/PCM (see page 11- 344).
4. Select the INSPECTION MENU with the HDS.
5. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts.
NOTE: If the TP POSITION CHECK indicates FAILED,
continue this procedure.
6. Exit the HDS diagnostic system, then select the update mode, and follow the screen prompts to
update the ECM/PCM.
(cont’d)
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11-330Fuel Supply System
Fuel Line/Quick-Connect Fitting Removal (cont’d)
A
B
A
4. Check the contact area (A) of the line (B) for dirt ordamage.
 If it is dirty, clean it, then dry it with the compressed air.
 If it is rusty or damaged, replace the fuel filter or fuel feed line. 5. To prevent damage and keep foreign matter out,
cover the disconnected connector and line ends
with plastic bags (A).
NOTE: The retainer cannot be reused once it has
been removed from the line.
Replace the retainer when: replacing the fuel rail.
 replacing the fuel feed line.
 replacing the fuel pump.
 replacing the fuel filter.
 replacing the fuel gauge sending unit.
 replacing the EVAP purge pipe.
 replacing the EVAP canister.
 replacing the fuel tank.
 replacing the fuel fill pipe.
 it has been removed from the line.
 it is damaged.
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