ACURA CSX 2006 Service Repair Manual

Î
Î(#') K20Z2 engine:
K20Z3 engine:
11-342Intake Air System
Component Location Index
THROTTLE BODY
AIR CLEANER
INTAKE AIR RESONATOR
INTAKE AIR BYPASS CONTROL
THERMAL VALVE ENGINE CONTROL MODULE (ECM)/
POWERTRAIN CONTROL MODULE (PCM)
THROTTLE BODY AIR CLEANER
INTAKE AIR RESONATOR
INTAKE AIR BYPASS CONTROL
THERMAL VALVE ENGINE CONTROL MODULE (ECM)
Test, page 11-343
Cleaning, page 11-344
Removal/Installation, page 11-348
Disassembly/Reassembly, page 11-350 Removal/Installation, page 11-345
Element Inspection/Replacement,
page 11-346
Removal/Installation,page 11-346
Test, page 11-344
Replacement, page 11-351 Update, page 11-227
Substitution, page 11-7
Replacement, page 11-228
Test, page 11-343
Cleaning, page 11-344
Removal/Installation, page 11-348
Disassembly/Reassembly, page 11-350 Removal/Installation, page 11-345
Element Inspection/Replacement,
page 11-346
Removal/Installation,page 11-346
Test, page 11-344
Replacement, page 11-351 Update, page 11-227
Substitution, page 11-7
Replacement, page 11-228
08/08/21 14:31:07 61SNR030_110_0342
ProCarManuals.com
DYNOMITE -2009-



(#'
)
Carbon Accumulation Check Throttle Position Learning Check
11-343
Throttle Body Test
A A
NOTE: If the malfunction indicator lamp (MIL) has been
reported on, check for diagnostic trouble code (DTCs).
1. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the ECM/ PCM. If it doesn’t, go to the DLC circuit
troubleshooting (see page 11- 204).
4. 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.
5. Check the REL TP SENSOR in the DATA LIST with the HDS. The reading should be below 2.46 deg. If it
is not, clean the throttle body (see page 11- 344).NOTE: If the malfunction indicator lamp (MIL) has been
reported on, check for diagnostic trouble code (DTCs).
1. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the ECM/ PCM. If it doesn’t, go to the DLC circuit
troubleshooting (see page 11-204).
4. Select the INSPECTION MENU with the HDS.
5. Do the TP POSITION CHECK in the ETCS TEST. If needed, clean the throttle body (see page 11-344).
08/08/21 14:31:07 61SNR030_110_0343
ProCarManuals.com
DYNOMITE -2009-


(#'
!) µ

(#') Special Tools Required
11-34411-344 Intake Air System
Throttle Body Cleaning
Intake Air Bypass Control Thermal
Valve Test
A A A
B
Do not insert your fingers into the installed throttle
body when you turn the ignition switch to ON (II) or
while the ignition switch is ON (II). If you do, you
will seriously injure your fingers if the throttle valve
is activated.
1. Check for damage to the air cleaner. If the air cleaner element is damaged, replace it (see page
11-346).
2. Remove the throttle body; K20Z2 engine (see page 11-348), K20Z3 engine (see page 11-349).
3. Clean off the carbon from the throttle valve and inside the throttle body with a paper towel soaked
in throttle plate and induction cleaner.
NOTE: Remove the throttle body to clean it.
 Be careful not to pinch your fingers.
 To avoid removing the molybdenum coating, do not clean the bearing area of the throttle shaft (A).
 Do not spray throttle plate and induction cleaner directly on the throttle body.
 Use Honda genuine throttle plate and induction cleaner.
4. Install the throttle body (see page 11- 348).
5. Reset the ECM/PCM with the HDS (see page 11-4).
6. Turn the ignition switch to ON (II), and wait 2 seconds.
7. Do the ECM/PCM idle learn procedure (see page 11-310). Vacuum pump/gauge, 0 30 in.Hg, Snap-on YA4000A
or equivalent, commercially available
1. Start the engine, then let it idle. NOTE: The engine coolant temperature must be
below 65 °C (149 °F).
2. Remove the engine cover (see step 1 on page 9-3).
3. Remove the vacuum hose (A) from the intake air duct, and connect a vacuum pump/gauge (B) to the
hose.
4. Raise and lower the engine speed, and make sure the vacuum gauge reading changes as the engine
speed changes.
If the vacuum reading does not change, check for
these problems:
 Misrouted, leaking, broken, or clogged intake air bypass control system vacuum lines.
 A cracked or damaged intake air bypass control thermal valve. Replace the valve if needed
(see page 11-351).
5. 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.
* : This illustration shows K20Z2 engine.
08/08/21 14:31:08 61SNR030_110_0344
ProCarManuals.com
DYNOMITE -2009-


(#'

 )
11-34511-345
Air Cleaner Removal/Installation
C B
12 N·m
(1.2 kgf·m,
8.7 lbf·ft)
A
6. Raise and lower the engine speed, and make sure the vacuum gauge reading does not change as the
rpm changes.
If the vacuum reading changes, check for these
problems:
 Misrouted, leaking, broken, or clogged intake air bypass control system vacuum lines.
 A cracked or damaged intake air bypass control thermal valve. Replace the valve if needed
(see page 11-351). 1. Disconnect the MAF sensor/IAT sensor 5P
connector (A).
2. Remove the bolts (B).
3. Remove the air cleaner (C).
4. Install the parts in the reverse order of removal.
* : This illustration shows K20Z2 engine.
08/08/21 14:31:08 61SNR030_110_0345
ProCarManuals.com
DYNOMITE -2009-


(#'
") 
(#'
 )
K20Z2 engine
11-34611-346 Intake Air System
Air Cleaner Element Inspection/
Replacement
Intake Air Resonator Removal/
Installation
A
B
C
D
E B
C
A
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
1. Open the air cleaner housing cover (A).
2. Remove the air cleaner element (B) from the air
cleaner housing (C).
3. Check the air cleaner element for damage or clogging. If it is damaged or clogged, replace it.
NOTE: Do not use compressed air to clean the air
cleaner element.
4. Clean and remove any debris from inside the air cleaner housing.
5. Install the parts in the reverse order of removal.  If you did not replace the air cleaner element, thisprocedure is complete.
 If the maintenance minder required air cleaner element replacement, reset the maintenance
minder(seepage3-7).
 If you replaced the air cleaner element, reset the ECM/PCM (see page 11-4), and do the ECM/PCM
idle learn procedure (see page 11-310). 1. Remove the front bumper (see page 20-146).
2. Remove the bolts (A), and pipe (B).
3. Remove the intake air resonator (C).
4. Do the battery removal procedure (see page 22-69).
5. Remove the bolt (D), and duct (E).
6. Install the parts in the reverse order of removal.
7. Do the battery installation procedure (see page
22-69).
08/08/21 14:31:09 61SNR030_110_0346
ProCarManuals.com
DYNOMITE -2009-


(#'
 )
K20Z3 engine
11-347
D
E B
C
A
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
1. Remove the front bumper (see page 20-146).
2. Remove the bolts (A), and pipe (B).
3. Remove the intake air resonator (C).
4. Do the battery removal procedure (see page 22-69).
5. Remove the bolt (D), and duct (E).
6. Install the parts in the reverse order of removal.
7. Do the battery installation procedure (see page
22-69).
08/08/21 14:31:10 61SNR030_110_0347
ProCarManuals.com
DYNOMITE -2009-


(#'
 )
K20Z2 engine
11-348Intake Air System
Throttle Body Removal/Installation
A
B
C
D
F E
22 N·m
(2.2 kgf·m, 16 lbf·ft)
Do not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II) or while the
ignition switch is ON (II). If you do, there will be serious injury to your fingers if the throttle valve is activated.
NOTE: If you are replacing or cleaning the throttle body, start at step 1. If you are removing the throttle body, start at
step 4. 1. Connect the HDS to the DLC while the engine is stopped.
2. Select the INSPECTION MENU with the HDS.
3. Do the TP POSITION CHECK in the ETCS TEST.
4. Turn the ignition switch to LOCK (0).
5. Remove the intake air duct (A).
6. Disconnect the throttle body connector (B).
7. Disconnect the water bypass hoses (C), and plug them.
8. Disconnect the vacuum hose (D).
9. Remove the throttle body (E).
10. Install the parts in the reverse order of removal with a new gasket (F), then do these:  Refill the radiator with engine coolant (see page 10-8).
 Do the ECM/PCM idle learn procedure (see page 11-310).
08/08/21 14:31:10 61SNR030_110_0348
ProCarManuals.com
DYNOMITE -2009-


(#'
 )
K20Z3 engine
11-349
22 N·m
(2.2 kgf·m, 16 lbf·ft)A
B
C D
E F
D
G
Do not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II) or while the
ignition switch is ON (II). If you do, there will be serious injury to your fingers if the throttle valve is activated.
NOTE: If you are replacing or cleaning the throttle body, start at step 1. If you are removing the throttle body, start at
step 4. 1. Connect the HDS to the DLC while the engine is stopped.
2. Select the INSPECTION MENU with the HDS.
3. Do the TP POSITION CHECK in the ETCS TEST.
4. Turn the ignition switch to LOCK (0).
5. Remove the intake air duct (A).
6. Disconnect the throttle body connector (B).
7. Disconnect the water bypass hoses (C), and plug them.
8. Disconnect the vacuum hoses (D) and the clamp (E).
9. Remove the throttle body (F).
10. Install the parts in the reverse order of removal with a new gasket (G), then do these:  Refill the radiator with engine coolant (see page 10-8).
 Do the ECM idle learn procedure (see page 11-310).
08/08/21 14:31:11 61SNR030_110_0349
ProCarManuals.com
DYNOMITE -2009-

Î
(#'
")
11-350Intake Air System
Throttle Body Disassembly/Reassembly
2.6 N·m
(0.26 kgf·m, 1.9 lbf·ft)
O-RING THROTTLE BODY
Replace.
08/08/21 14:31:11 61SNR030_110_0350
ProCarManuals.com
DYNOMITE -2009-


(#' )
11-351
Intake Air Bypass Control Thermal Valve Replacement
B
15 N·m
(1.5 kgf·m, 11 lbf·ft)90 °
A
A
30 °Front
Front 30 °
D C
1. Remove the engine cover (see step 1 on page 9-3).
2. Remove the intake air duct.
 K20Z2 engine (see page 11-348)
 K20Z3 engine (see page 11-349)
3. Disconnect the hoses (A).
4. Remove the intake air bypass control thermal valve (B).
5. Install the parts in the reverse order of removal.
NOTE: Position the valve angle as shown.
 Make sure the center of clamp (C) and the lever end of clamp (D) are the position within the range
shown.
* : This illustration shows K20Z2 engine.
08/08/21 14:31:11 61SNR030_110_0351
ProCarManuals.com
DYNOMITE -2009-