2006 ACURA CSX fuel pressure



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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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
08/08/21 14:13:47 61SNR030_110_0050
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ECM/PCM Circuit Diagram (K20Z2 engine) (cont’d)
11-52 Fuel and Emissions Systems
System Description (cont’d)
A/F SENSOR
(SENSOR 1)
2
RED
C29
AFS RED
C30
AFS RED/YEL
C9
AFSHTC 1
RED/BLU
3
BLU
4
Q
10
C101
SECONDARY
HO2S
(SENSOR 2)
3
4
C27
SHO2S
B4
SO2SHTC H
P
I
OIL PRESSURE
SWITCH
B7
OPSW
YEL/RED
A25 1
3
BRN
VCC4
A17 1
YEL
APSA
A35 2
BLU
SG4
A24 6
GRY
VCC5
A18 4
PUR
APSB
A34 5
LT BLU
SG5 9
5 THROTTLE
ACTUATOR
1 6
WHT/RED 2
13
4
6
5
BLU
RED/BLK RED/BLK
GRN RED/BLU
BLU/RED GRN/YEL
C4
ETCSM
C3
ETCSM C39
SG3 C21
TPSB
C12
VCC3
C20
TPSA
GRN BLU
GRNPUR
R
WHT/GRN
3 (2) *81 (5) *8
2 (6) *8 BLK
YEL
C209
AB
1 2
THROTTLE BODY
APP SENSOR A/B
BLK/WHT
WHT
PNK TP SENSOR
AB
BRN
PNK WHT
BLU/RED
GRN/YEL
14
15
19
23
18
*8: ’09 model
08/08/21 14:13:49 61SNR030_110_0052
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ECM Circuit Diagram (K20Z3 engine) (cont’d)
11-60Fuel and Emissions Systems
System Description (cont’d)
C22
BLU/BLK
BRN/YELROCKER ARM
OIL PRESSURE
SWITCH
MAP SENSOR
C13
C11
C14 YEL/RED
GRN/WHT
C23 BLU/WHT
C42
RED/BLU
KNOCK SENSOR1
1
GRN/RED
RED/BLU
C106
VTC OIL CONTROL
SOLENOID VALVE
B34
GRN/YEL
VTPSW VTS
VCC1
MAP
SG1
KS
VTC BLU/WHT
2
1
G101 1
10 YEL/RED
GRN/WHT GRN/RED
C B
3
2 2
3
G101 BLU/BLKROCKER ARM
OIL CONTROL
SOLENOID
1
GRN/YEL 2
2
B18
YEL
VCC2
C43 BLK/WHT
NC
GRN/BLK1
OUTPUT SHAFT
(COUNTERSHAFT)
SPEED SENSOR
12 V
BLK
AB
BLK
08/08/21 14:13:54 61SNR030_110_0060
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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
08/08/21 14:15:29 61SNR030_110_0064
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YES
NO
YES
NO
YES
NO
DTC P0171:
DTC P0172:
11-11311-113
29. Reconnect all connectors.
30. Update the ECM/PCM if it does not have the latest
software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
31. Start the engine, and let idle.
32. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the secondary HO2S (Sensor 2) and
the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 31. If the ECM/PCM was substituted,
go to step 1.
Go to step 33.
33. Monitor the OBD STATUS for DTC P0141 in the DTCs MENU with the HDS.
If the ECM/PCM was updated,
troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 32, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the secondary
HO2S (Sensor 2) and the ECM/PCM. If the ECM/
PCM was updated, substitute a known-good ECM/
PCM (see page 11-7), then go to step 31. If the ECM/
PCM was substituted, go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a
result comes on. NOTE:
 Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
 If any of the DTCs listed below are indicated at the same time as DTC P0171 and/or P0172, troubleshoot
those DTCs first, then recheck for P0171 and/or P0172.
P0101, P0102, P0103: Mass air flow (MAF) sensor
P0107, P0108, P1128, P1129: Manifold absolute
pressure (MAP) sensor
P0133, P1157, P1172, P2195, P2238, P2252, P2A00: Air
fuel ratio (A/F) sensor (Sensor 1)
P0134, P0135: Air fuel ratio (A/F) sensor (Sensor 1)
heater
P0137, P0138, P0139, P2270, P2271: Sec ondary HO2S
(Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
P0401 , P0404 , P0406 , P2413 : Exhaust gas
recirculation (EGR) system
P0443, P0496: EVAP canister purge valve
P2646, P2647, P2648, P2649: VTEC system : K20Z2 engine
1. Check the fuel pressure (see page 11-325).
Go to step 2.
 If the pressure is too high, replace the fuel pressure regulator (see page 11-337), then go to
step 7.
 If the pressure is too low, check the fuel pump, the fuel feed pipe and the fuel filter. If they are
OK, replace the fuel pressure regulator (see page
11-337), then go to step 7.
(cont’d)Fuel System Too Lean
Fuel System Too Rich
Is DTC P0141 indicated?Does t he scr een i nd i cat e PASSE D? Is the fuel pressure OK?
08/08/21 14:17:24 61SNR030_110_0113
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DYNOMITE -2009-

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DTC P0300:
DTC P0301:
DTC P0302:
DTC P0303:
DTC P0304:
Special Tools Required YES
NO
YES
NO
YES
NO
11-115
Random Misfire and Any
Combination of the Following:
No. 1 Cylinder Misfire Detected
No. 2 Cylinder Misfire Detected
No. 3 Cylinder Misfire Detected
No. 4 Cylinder Misfire Detected
 Pressure gauge adapter 07NAJ-P07010A
 A/T low pressure gauge w/panel 07406-0070301
 A/T pressure hose 07406-0020201
 A/T pressure hose, 2,210 mm 07MAJ-PY4011A
 A/T pressure hose, adapter 07MAJ-PY40120
 Oil pressure hose 07ZAJ-S5AA200
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
 If the misfire is frequent enough to trigger detection of increased emissions during two consecutive
driving cycles, the MIL will come on, and DTC P0300
(and some of the combination of P0301 thr ough
P0304) will be stored.
 If the misfire is frequent enough to damage the catalyst, the MIL will blink whenever the misfire
occurs, and DTC P0300 (and some of the combination
of P0301 through P0304) will be stored. When the
misfire stops, the MIL will remain on.
 If any of the DTCs listed below are indicated at the same time as the random misfire DTCs, troubleshoot
those DTCs first, then recheck for random misfire
DTCs:
P0101, P0102, P0103: Mass air flow (MAF) sensor
P0107, P0108: Manifold absolute pressure (MAP)
sensor
P0171, P0172: Fuel system
P0335, P0339: Crankshaft position (CKP) sensor
P0365, P0369: Camshaft position (CMP) sensor B
P0401 , P0404 , P0416 , P2413 : Exhaust gas
recirculation (EGR) system
P0506, P0507: Idle control system
P2646, P2647, P2648, P2649: VTEC system : K20Z2 engine 1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load (A/T in
P or N, M/T in neutral).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.
Go to step 9.
If the screen indicates PASSED, go to step 5. If
the screen indicates EXECUTING, keep idling until
a result comes on. If the screen indicates OUT OF
CONDITION, wait for several minutes, then recheck.
5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST
for 10 minutes with the HDS.
Go to step 9.
Go to step 6.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
 ENGINE S PEED
 VSS
 REL TP SENSOR
 CLV (calculated load value)
 APP SENSOR
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS.
Go to step 9.
If the screen indicates PASSED, go to step 8. If
the screen indicates EXECUTING, keep driving until
a result comes on. if the screen indicates OUT OF
CONDITION, go to step 6 and recheck.
(cont’d)
Does t he scr een i nd i cat e F AILE D?
Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3M I SF I RE , and / or CY L4 M I SF I RE show mi sf i r ecounts?
Does t he scr een i nd i cat e F AILE D?
08/08/21 14:17:24 61SNR030_110_0115
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YES
NO
YES
NO
YES
NO YES
NO
YES
NO
YES
NO
11-116
PGM-FI System
DTC Troubleshooting (cont’d)
8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3
MISFIRE, and/or CYL4 MISFIRE in the DATA LIST
for 10 minutes with the HDS.
Go to step 9.
Intermittent failure, the system is OK at this
time.
9. Turn the ignition switch to LOCK (0).
10. Check the fuel quality.
Go to step 11.
Drain the tank, fill it with a known-good fuel,
then go to step 25.
11. Inspect the spark plugs (see page 4-21). If the spark plugs are fouled or worn, replace them.
12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
 ENGINE S PEED
 VSS
 REL TP SENSOR
 CLV (calculated load value)
 APP SENSOR
13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST
for 10 minutes with the HDS.
Go to step 14.
Go to step 25. 14. Check the fuel pressure (see page 11-325).
Go to step 15.
 If the fuel pressure is too high, replace the fuel pressure regulator (see page 11-337), then go to
step 25.
 If the fuel pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If
they are OK, replace the fuel pressure regulator
(see page 11-337), then go to step 25.
15. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
16. Check for these conditions:  Engine coolant temperature (ECT SENSOR 1)above80°C(176°F)
 A/T in P or N, M/T in neutral
 All electrical loads off
17. Monitor the ENGINE SPDEED in the DATA LIST with the HDS, and hold the engine speed at
2,500 rpm. Once the engine speed is met, hold the
accelerator pedal steady for more than 10 seconds.
Repeat step 17.
Go to step 18.
18. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS.
Go to step 19.
Replace the MAF sensor/IAT sensor (see page
11-224), then go to step 25.
Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 M I SF I RE , and / or CY L4 M I SF I RE show mi sf i r ecounts?
Is the quality good?
Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3M I SF I RE , and / or CY L4 M I SF I RE show mi sf i r ecounts? Is the fuel pressure OK?
Di d t he engi ne speed v ar y mor e t han 100 r pm f r om2,500 rpm?
Is t her e about 6.0 8.6 ( K 20Z 2 engi ne) or5.7 8.3 (K 20Z 3 engine) gm/ s?
08/08/21 14:17:24 61SNR030_110_0116
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