Engine air ACURA CSX 2006 Service Repair Manual

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21-721-7
A/C Refrigerant Oil Replacement
A
B C
3. Inspect the drive belt (see page 4-30).
4. Make sure no material is blocking the air flow to the
A/C condenser.
5. Check the dust and pollen filter. Replace it if it is clogged (see page 21-75).
6. Check for kinks or sharp bends in the A/C lines and hoses, which can greatly reduce system
performance. Replace A/C lines and hoses if they
are kinked or damaged (see page 21-8).
7. Start the engine, turn the air conditioning system on, and allow it to run for a few minutes and reach
stable operation.
 Check that the A/C operates at each position of the blower fan switch (except OFF). If the A/C
does not operate, refer to the symptom
troubleshooting.
 Check that the A/C compressor clutch (A) is engaged. The pressure plate should be rotating
at the same speed as the pulley. If the pressure
plate does not engage, refer to the symptom
troubleshooting.
 Check that the A/C condenser fan (B) and radiator fan (C) operate when the A/C compressor clutch
is engaged. If either fan fails to operate when the
A/C compressor clutch is engaged, refer to the
symptom troubleshooting.
 Check that the engine idle speed is correctly maintained when the A/C is switched on and off
and the A/C compressor clutch is engaged and
disengaged. Recommended PAG oil: SP-10
P/N 38897-P13-A01AH: 120 mL (4 fl·oz)
It is important to have the correct amount of refrigerant
oil in the A/C system to ensure proper lubrication of the
compressor. Too little oil damages the compressor; too
much oil reduces the cooling capacity of the system,
and can produce high vent temperatures.
 To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other
refrigerant oils.
 Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture
absorption.
 Do not spill the refrigerant oil on the vehicle; it may damage the paint; if it gets on the paint, wash it off
immediately.
Add the recommended refrigerant oil in the amount
listed if you replace any of the following parts: ........
.............. ............ ........
..............
........
.............. ............ ........
..............
A/C condenser .50 mL (1 2/3 fl·oz)
Evaporator .40 mL (1 1/3 fl·oz)
Line or hose .10 mL (1/3 fl·oz)
Receiver/Dryer .10 mL (1/3 fl·oz)
Leakage repair .25 mL (5/6 fl·oz)
A/C compressor .Since the oil separator is
equipped inside the compressor
for this vehicle, oil drainage is
unnecessary at the time of
compressor replacement.
08/08/21 14:40:56 61SNR030_210_0008
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Displaying Sensor Inputs at the Climate Control Unit
Check these items before using the sensor input display mode
To run the sensor input display mode, follow these steps
21-13
The climate control unit has a mode that displays the sensor inputs it receives. This mode shows you what data the
climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is
faulty.1. Turn the ignition switch to ON (II), and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperature, note these items:
 ‘‘Lo’’ temperature setting will default to MAX COOL, VENT, and RECIRC.
 ‘‘Hi’’ temperature setting will default to MAX HOT, FLOOR, and FRESH.
 19 through 31 °C settings will use the automatic climate control logic.
3. Turn the ignition switch to LOCK (0).
1. Turn the ignition switch to LOCK (0).
2. Press and hold both the AUTO and MODE buttons, then start the engine.
3. After the engine starts, release both buttons. The display panel will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the A/C button. Sensor Item Displayed Value1 Mode Positioning BIT
2 In-car Temperature °C
3 Outside Air Temperature °C
4 Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy = 10, Sunny = 65 10 kcal/m ·h
5 Evaporator Outlet Air Temperature °C
6 Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening
7 Recirculation Opening % of opening
8 Vehicle Speed (Vehicle must be driven to display speed) km/h
9 Engine Coolant Temperature °C
A Vent Temperature Air Out (TAO) °C
NOTE:  The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the chart to convert the value to degrees Fahrenheit (°F).
 If the sensor value displays ‘‘Er’’ this indicates there is an open or short in the circuit or sensor. Check for DTCs using the HDS, or use the climate control self-diagnostic function.
 If necessary, compare the sensor input display to a known-good vehicle under the same test conditions.
 If the sensor is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck.
5. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch to LOCK (0). (cont’d)
2
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SymptomDiagnostic procedure Also check for
21-17


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Blower fan runs slower
than expected in cold
weather (when in
AUTO mode)
NOTE: It is normal for
the blower fan to run
slowly until the coolant
temperature rises
when in AUTO mode
Probable cause: Engine coolant temperature
(ECT) circuit malfunction
Troubleshooting the ECT sensor circuit:
ECT sensor 2 circuit low voltage (see page
11-170)
ECT sensor 2 circuit high voltage (see page
11-172) HVAC DTCs (see page 21-9)
Powertrain DTCs (see page
11-3)
Blower motor operation
The A/C compressor
clutch cycles rapidly on
and off Probable cause: A/C system is very low on
refrigerant, indicating a possible leak
Do the refrigerant leak check (see page 21-93)
and repair any leaks. Replace the receiver/dryer
(see page 21-89), then recharge the system to
specifications (see page 21-92) HVAC DTCs (see page 21-9)
If there is no leak and the
refrigerant level is normal, do
the A/C compressor clutch
circuit troubleshooting
(see page 21-62), and look for
an intermittent problem
Warm air comes out of
the vents, and the high
pressure liquid line is
very hot Probable causes: The A/C system is overcharged
(too much refrigerant), or the condenser is
malfunctioning
Recover A/C refrigerant (see page 21-90), then
check the condenser for restrictions or poor
airflow. Repair as needed. Recharge the system
to specifications (see page 21-92) Incorrect tension or abnormal
wear on the drive belt. Replace
the belt and/or the belt
tensioner as needed
Proper operation of the
condenser/radiator fans. Repair
as needed
Signs of an overheated engine.
Repair as needed
Warm air comes out of
the vents. The suction
line is cool to warm,
and the discharge line
is warm to hot Probable cause: A/C system is low on refrigerant,
indicating a possible leak
Do the refrigerant leak check (see page 21-93)
and repair any leaks. Recharge the system to
specifications (see page 21-92) HVAC DTCs (see page 21-9)
Add refrigerant oil depending
on the part you replaced
(see page 21-7)
Warm air comes out of
the vents. The suction
line is cool to warm,
the discharge line is
warm to hot, and there
is no frost on the
expansion valve Probable cause: Excessive air and/or moisture in
the system, indicating a possible leak
Do the refrigerant leak check (see page 21-93)
and repair any leaks. Replace the receiver/dryer
(see page 21-89), then recharge the system to
specifications (see page 21-92)
HVAC DTCs (see page 21-9)
Check the amount of refrigerant
oil in the system. Adjust the oil
level as needed
Warm air comes out of
the vents. The liquid
line or the condenser
outlet is abnormally
cool, or there is frost or
condensation on the
receiver/dryer Probable cause: A restriction in the high-pressure
side of the system
Recover A/C refrigerant (see page 21-90), then
check the liquid line, the receiver/dryer, and the
condenser for restrictions. Repair as needed.
Recharge the system to specifications (see page
21-92) HVAC DTCs (see page 21-9)
There is heavy frost or
condensation on the
expansion valve, and
frost on the suction line Probable cause: A restriction in the low-pressure
side of the system
Recover A/C refrigerant (see page 21-90), then
check the suction line and the expansion valve
for restrictions. Repair as needed. Recharge the
system to specifications (see page 21-92) HVAC DTCs (see page 21-9)
(cont’d)
08/08/21 14:40:59 61SNR030_210_0018
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Oil Separator
21-20Climate Control
System Description (cont’d)
OUTLET SIDE
(To A/C condenser)
OIL SEPARATOR
FROM INSIDE
A/C COMPRESSOR
INLET SIDE
(To inside
A/C compressor)
EVAPORATOR
A/C COMPRESSOR A/C CONDENSER
EXPANSION VALVE
HIGH REFRIGERANT OIL FLOWLOW REFRIGERANT OIL FLOW
OIL SEPARATOR
Oil emission from the A/C compressor to the A/C line is reduced by placing the oil separator in the A/C compressor.
This results in a thinner oil film inside of the heat exchangers (A/C condenser and evaporator). Air conditioning
efficiency is increased without sacrificing engine performance.
08/08/21 14:41:00 61SNR030_210_0021
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21-57
RADIATOR FAN RELAY 4P SOCKET ECM/PCM CONNECTOR A (44P)PUR
JUMPER WIRE
10. Disconnect the jumper wire.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between the radiator fan relay 4P socket terminal No. 3 and body ground.
Go to step 13.
Go to step 37. 13. Turn the ignition switch to LOCK (0).
14. Reinstall the radiator fan relay.
15. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the engine
control module (ECM)/powertrain control module
(PCM) from damage.
16. Disconnect ECM/PCM connector A (44P).
17. Connect the ECM/PCM connector A (44P) terminal No. 4 to body ground with a jumper wire.
18. Turn the ignition switch to ON (II). Check for loose wires or poor connections at
ECM/PCM connector A (44P) terminal No. 4. If the
connections are good, substitute a known-good
ECM/PCM, and recheck. If the symptom/indication
goes away, replace the original ECM/PCM
(see page 11-228).
Repair open in the wire between the radiator
fan relay and the ECM/PCM.
19. Disconnect the jumper wire.
20. Reinstall the radiator fan relay.
21. Disconnect the radiator fan 2P connector.
22. Turn the ignition switch to ON (II), then set the A/C button and fan control dial ON.
(cont’d)
Terminal side of female terminals
Is there battery voltage?
Do t he A/ C cond enser and r ad i at or f ans r un onlow?
08/08/21 14:42:26 61SNR030_210_0058
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21-61
ECM/PCM CONNECTOR A (44P)
GRY
JUMPER WIRE A/C DIODE B 2P SOCKET
A/C DIODE B
1 2
1 2
8. Turn the ignition switch to LOCK (0).
9. Reinstall the A/C condenser fan relay.
10. Jump the SCS line with the HDS. NOTE: This step must be done to protect the engine
control module (ECM)/powertrain control module
(PCM) from damage.
11. Disconnect ECM/PCM connector A (44P).
12. Connect the ECM/PCM connector A (44P) terminal No. 5 to body ground with a jumper wire.
13. Turn the ignition switch to ON (II). Check for loose wires or poor connections at
ECM/PCM connector A (44P) terminal No. 5. If the
connections are good, substitute a known-good
ECM/PCM, and recheck. If the symptom/indication
goes away, replace the original ECM/PCM
(see page 11-228).
Repair open in the wire between the A/C
condenser fan relay and the ECM/PCM. 14. Remove the A/C diode B from the under-hood fuse/
relay box.
15. Turn the ignition switch to ON (II).
16. Measure the voltage between the A/C diode B 2P socket terminal No. 2 and body ground.
Go to step 17.
Replace the under-hood fuse/relay box
(see page 22-65).
17. Using the diode setting ( ) on a DVOM, check for current flow in both directions between the A/C
diode B terminals No. 1 and No. 2.
Replace the under-hood fuse/relay box
(see page 22-65).
Replace the A/C diode B.
Terminal side of female terminals
Does t he A/ C cond enser f an r un on hi gh? Is there battery voltage?
I s t her e cur r ent f l ow i n onl y one d i r ect i on?
08/08/21 14:43:32 61SNR030_210_0062
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21-63
JUMPER WIRE
PUR
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
BRN ECM/PCM CONNECTOR A (44P)
JUMPER WIRE RED
9. Connect the A/C compressor clutch relay 4P socket
terminals No. 1 and No. 2 with a jumper wire.
Go to step 10.
Go to step 19.
10. Disconnect the jumper wire.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between the A/C compressor clutch relay 4P socket terminal No. 3 and body
ground.
Go to step 13.
Repair open in the wire between the No. 36
(10 A) fuse in the under-dash fuse/relay box and the
A/C compressor clutch relay. 13. Turn the ignition switch to LOCK (0).
14. Reinstall the A/C compressor clutch relay.
15. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the engine
control module (ECM)/powertrain control module
(PCM) from damage.
16. Disconnect ECM/PCM connector A (44P).
17. Connect the ECM/PCM connector A (44P) terminal No. 14 to body ground with a jumper wire.
18. Turn the ignition switch to ON (II). Check for loose wires or poor connections at
ECM/PCM connector A (44P). If the connections are
good, check the ECM/PCM grounds. If the grounds
are good, substitute a known-good ECM/PCM, and
recheck. If the symptom/indication goes away,
replace the original ECM/PCM (see page 11-228).
Repair open in the wire between the A/C
compressor clutch relay and the ECM/PCM.
(cont’d)
Terminal side of female terminals
Does the A/ C compressor clutch click?
Is there battery voltage? Does t he A/ C compr essor cl i ck ?
08/08/21 14:43:33 61SNR030_210_0064
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21-6421-64Climate Control
A/C Compressor Clutch Circuit
Troubleshooting (cont’d)
A/C Signal Circuit Troubleshooting
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
RED/WHT
A/C COMPRESSOR CLUTCH 3P CONNECTOR PUR
REDBRN
CLIMATE CONTROL UNIT 32P CONNECTOR
19. Disconnect the jumper wire.
20. Disconnect the A/C compressor clutch 3P connector.
21. Check for continuity between the A/C compressor
clutch relay 4P socket terminal No. 2 and the A/C
compressor clutch 3P connector terminal No. 2.
Check the A/C compressor clutch clearance,
and the compressor clutch field coil (see page
21-85). Repair as needed.
Repair open in the wire between the A/C
compressor clutch relay and the A/C compressor
clutch. NOTE:
 Do not use this troubleshooting procedure if any of the following items are operative: A/C condenser fan,
radiator fan, A/C compressor. Refer to the symptom
troubleshooting index.
 Before doing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Connect the HDS to the DLC.
2. Start the engine.
3. Turn on the A/C.
4. Check the A/C SWITCH in the PGM-FI Data List with the HDS.
The A/C signal is OK at this time.
Go to step 5.
5. Turn the ignition switch to LOCK (0), and disconnect the climate control unit 32P connector.
6. Measure the evaporator temperature sensor resistance between the climate control unit 32P
connector terminals No. 8 and No. 19.
Go to step 7.
Test the evaporator temperature sensor
(see page 21-70).
Wire side of female terminals
Wire side of female terminals
Is there continuity?Is the A/ C SW IT CH on?
I s r esi st ance l ess t han 24 k ?
08/08/21 14:43:33 61SNR030_210_0065
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21-6421-64Climate Control
A/C Compressor Clutch Circuit
Troubleshooting (cont’d)
A/C Signal Circuit Troubleshooting
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
RED/WHT
A/C COMPRESSOR CLUTCH 3P CONNECTOR PUR
REDBRN
CLIMATE CONTROL UNIT 32P CONNECTOR
19. Disconnect the jumper wire.
20. Disconnect the A/C compressor clutch 3P connector.
21. Check for continuity between the A/C compressor
clutch relay 4P socket terminal No. 2 and the A/C
compressor clutch 3P connector terminal No. 2.
Check the A/C compressor clutch clearance,
and the compressor clutch field coil (see page
21-85). Repair as needed.
Repair open in the wire between the A/C
compressor clutch relay and the A/C compressor
clutch. NOTE:
 Do not use this troubleshooting procedure if any of the following items are operative: A/C condenser fan,
radiator fan, A/C compressor. Refer to the symptom
troubleshooting index.
 Before doing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Connect the HDS to the DLC.
2. Start the engine.
3. Turn on the A/C.
4. Check the A/C SWITCH in the PGM-FI Data List with the HDS.
The A/C signal is OK at this time.
Go to step 5.
5. Turn the ignition switch to LOCK (0), and disconnect the climate control unit 32P connector.
6. Measure the evaporator temperature sensor resistance between the climate control unit 32P
connector terminals No. 8 and No. 19.
Go to step 7.
Test the evaporator temperature sensor
(see page 21-70).
Wire side of female terminals
Wire side of female terminals
Is there continuity?Is the A/ C SW IT CH on?
I s r esi st ance l ess t han 24 k ?
08/08/21 14:43:33 61SNR030_210_0065
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21-81
Heater Unit/Core Replacement
A
B C
8x1.25mm
12.3 N·m
(1.3 kgf·m, 9.0 lbf·ft)
B A
SRS components are located in this area. Review the
SRS component locations (see page 24-11) and the
precautions and procedures (see page 24-13) before
doing repairs or service.
1. Do the battery terminal disconnection procedure (see page 22-68).
2. Disconnect the A/C line from the evaporator core
(see page 21-78).
3. Remove the air cleaner housing assembly (see page 11-345).
4. When the engine is cool, drain the engine coolant from the radiator (see page 10-8).
5. From under the hood, slide the hose clamps (A) back. Disconnect the inlet heater hose (B) and the
outlet heater hose (C) from the heater unit. Note the
orientation of the hoses.
Engine coolant will run out when the hoses are
disconnected; drain it into a clean drip pan. Be sure
not to let coolant spill on the electrical parts or the
painted surfaces. If any coolant spills, rinse it off
immediately. 6. Remove the mounting nut from the heater unit.
Take care not to damage or bend the fuel lines or
brake lines, etc.
7. Remove the dashboard (see page 20- 108).
8. Disconnect the connector (A) from the blower motor. Remove the wire harness clip (B).
(cont’d)
08/08/21 14:43:43 61SNR030_210_0082
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