Acura CSX. Manual — part 169
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Special Tools Required
11-344
11-344
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.
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11-345
11-345
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.
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K20Z2 engine
11-346
11-346
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, this
procedure is complete.
• If the maintenance minder required air cleaner
element replacement, reset the maintenance
minder (see page 3-7).
• 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).
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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
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