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.
08/08/21 14:31:08 61SNR030_110_0344