Acura CSX. Instruction — page 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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