2006 ACURA CSX engine coolant





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
08/08/21 14:13:41 61SNR030_110_0040
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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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11-72PGM-FI System
Component Location Index
IGNITION COILS
CAMSHAFT POSITION (CMP)
SENSOR B (EXHAUST SIDE)
ELECTRICAL LOAD
DETECTOR (ELD)
PGM-FI MAIN
RELAY 1IGNITION
COIL RELAY
PGM-FI
SUBRELAY
MASS AIR FLOW (MAF)
SENSOR/INTAKE AIR
TEMPERATURE
(IAT) SENSOR
ENGINE COOLANT
TEMPERATURE (ECT) SENSOR 1
OUTPUT SHAFT (COUNTERSHAFT)
SPEED SENSOR (M/T)
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
MANIFOLD ABSOLUTE
PRESSURE (MAP) SENSOR
KNOCK SENSOR
INJECTORS
CRANKSHAFT POSITION
(CKP) SENSOR ENGINE CONTROL MODULE (ECM)/
POWERTRAIN CONTROL
MODULE (PCM)
Replacement, page 11-222
Replacement, page 11-226
Replacement,page 11-224
Replacement, page 11-225
Replacement, page 11-223
Replacement, page 11-225
Replacement, page 11-224
Replacement, page 11-223
Replacement,
page 11-219
Replacement,
page 11-222 Update, page 11-227
Substitution, page 11-7
Replacement, page 11-228
* : This illustration shows K20Z2 engine
08/08/21 14:15:36 61SNR030_110_0072
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DTC P0128:
YES
NO
YES
NO YES
NO
YES
NO
YES
NO
11-96PGM-FI System
DTC Troubleshooting (cont’d)
Cooling System Malfunction
NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Make sure the blower switch is OFF.
4. Check the FAN CTRL in the DATA LIST with the HDS.
Go to step 5.
Wait until the FAN CTRL is off, then go to step
5.
5. Check the radiator fan operation.
Check the radiator fan high speed circuit
(see page 10-26), and the radiator fan relay
(see page 22-70). If the circuit and the relay are OK,
go to step 19.
Go to step 6.
6. Let the engine cool until the coolant temperature is 40 °C (104 °F) or less.
7. Note the value of ECT SENSOR 1 and ECT SENSOR 2intheDATALISTwiththeHDS.
8. Start the engine, and let it idle.
9. Let the engine idle until ECT SENSOR 1 goes up 22 °C (40 °F) or more from the recorded
temperature.
10. Check ECT SENSOR 2 in the DATA LIST with the HDS. 11. Compare the recorded value of ECT SENSOR 2 and
the present value of ECT SENSOR 2.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at ECT sensor 1, ECT sensor 2, and the ECM/PCM.
Test the thermostat (see page 10-5), then go
to step 12.
12. Turn the ignition switch to ON (II).
13. Reset the ECM/PCM with the HDS.
14. Let the engine cool until the coolant temperature is between 6 °C (21 °F) and 40 °C (104 °F).
15. Do the ECM/PCM idle learn procedure (see page 11-310).
16. Test-drive at a steady speed between 24 120 km/h (15 75 mph) for 10 minutes.
17. Check for Temporary DTCs or DTCs with the HDS.
Check the cooling system (see page 10-2),
then go to step 1.
Go to step 18.
18. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 17,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check the
coolingsystem(seepage10-2),thengotostep1.If
the screen indicates NOT COMPLETED, go to step
14.
Is it OFF?
Does t he r ad i at or f an k eep r unni ng? Di d t emper at ur e r i se 8 ° C ( 14 ° F ) or mor e f r om t he
r ecor d ed t emper at ur e?
Is DTC P0128 indicated?Does t he scr een i nd i cat e PASSE D?
08/08/21 14:17:17 61SNR030_110_0096
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YES
NO
YES
NO
YES
NO
DTC P0133:
11-9711-97
19. 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).
20. Let the engine cool until the coolant temperature is between 6 °C (21 °F) and 40 °C (104 °F).
21. 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.
22. Test-drive at a steady speed between 24 120 km/h (15 75 mph) for 10 minutes.
23. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at ECT sensor 1, ECT 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 20. If the ECM/PCM was substituted, go to
step 1.
Go to step 24.
24. Monitor the OBD STATUS for DTC P0128 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 23, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at ECT sensor 1,
ECT 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 20. If the ECM/PCM
was substituted, go to step 1. If the screen indicates
NOT COMPLETED, go to step 20. NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. 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.
4. Test-drive under these conditions:  Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin3rdor4th
 Drive the vehicle at 40 km/h (25 mph) or less for 5 minutes, then drive at a steady speed between
41 130 km/h (26 81 mph).
5. Monitor the OBD STATUS for DTC P0133 in the DTCs MENU with the HDS.
Go to step 6.
If the screen indicates PASSED, intermittent
failure, the system is OK at this time. Check for
poor connections or loose terminals at the A/F
sensor (Sensor 1) and the ECM/PCM. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0).
7. Replace the A/F sensor (Sensor 1) (see page 11-221).
8. Turn the ignition switch to ON (II).
9. Reset the ECM/PCM with the HDS.
(cont’d)A/F Sensor (Sensor 1)
Malfunction/Slow Response
Is DTC P0128 indicated?
Does t he scr een i nd i cat e PASSE D? Does t he scr een i nd i cat e F AILE D?
08/08/21 14:17:17 61SNR030_110_0097
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YES
NO
YES
NO
YES
NO
YES
NO
DTC P0134:
11-9811-98PGM-FI System
DTC Troubleshooting (cont’d)
10. Do the ECM/PCM idle learn procedure (see page
11-310).
11. 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.
12. Test-drive under these conditions:
 Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin3rdor4th
 Drive the vehicle at 40 km/h (25 mph) or less for 5 minutes, then drive at a steady speed between
41 130 km/h (26 81 mph).
13. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the A/F sensor (Sensor 1) and the ECM/
PCM, then go to step 1.
Go to step 14.
14. Monitor the OBD STATUS for DTC P0133 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 13,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the A/F sensor
(Sensor1)andtheECM/PCM,thengotostep1.If
the screen indicates EXECUTING, keep driving until
a result comes on. If the screen indicates OUT OF
CONDITION, go to step 11. 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 vehicle was out of fuel and the engine stalled before this DTC was stored, refuel and clear the DTC
with the HDS.
 If DTC P0135 is stored at the same time as DTC P0134, troubleshoot DTC P0135 first, then recheck for DTC
P0134.
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) until the radiator fan comes
on.
4. Check for Temporary DTCs or DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the A/F sensor (Sensor 1), the PGM-FI subrelay,
and the ECM/PCM.
5. Turn the ignition switch to LOCK (0).
6. Replace the A/F sensor (Sensor 1) (see page 11-221).
7. Turn the ignition switch to ON (II).
8. Reset the ECM/PCM with the HDS.
9. Do the ECM/PCM idle learn procedure (see page 11-310).
10. 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 11.A/F Sensor (Sensor 1) Heater
System Malfunction
Is DT C P0133 ind icated ?
Does t he scr een i nd i cat e PASSE D? Is DT C P0134 ind icated ?
Is DT C P0134 ind icated ?
08/08/21 14:17:18 61SNR030_110_0098
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YES
NO YES
NO
YES
NO
11-105
SECONDARY HO2S (SENSOR 2) 4P CONNECTOR
SHO2S (WHT)
13. Check for continuity between secondary HO2S(Sensor 2) 4P connector terminal No. 2 and body
ground.
Repair short in the wire between the ECM/
PCM (C27) and the secondary HO2S (Sensor 2),
then go to step 16.
Go to step 24.
14. Turn the ignition switch to LOCK (0).
15. Replace the secondary HO2S (Sensor 2) (see page 11-221).
16. Reconnect all connectors.
17. Turn the ignition switch to ON (II).
18. Reset the ECM/PCM with the HDS.
19. Do the ECM/PCM idle learn procedure (see page 11-310).
20. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes
on. 21. Test-drive under these conditions:
 Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin4th
 Engine speed between 1,500 3,000 rpm
 Drive about 1 minute or more
22. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the secondary HO2S (Sensor 2) and
theECM/PCM,thengotostep1.
Go to step 23.
23. Monitor the OBD STATUS for DTC P0137 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 22,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the secondary
HO2S(Sensor2)andtheECM/PCM,thengotostep
1. If the screen indicates EXECUTING, keep driving
until a result comes on. If the screen indicates OUT
OF CONDITION, go to step 20.
(cont’d)
Terminal side of male terminals
Is there continuity? Is DT C P0137 ind icated ?
Does t he scr een i nd i cat e PASSE D?
08/08/21 14:17:21 61SNR030_110_0105
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