vent ACURA CSX 2006 Service Repair Manual

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)
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SymptomDiagnostic procedure Also check for
21-18Climate Control
Symptom Troubleshooting Index (cont’d)





 


 


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Warm air comes out of
the vents, and there is
frost on the expansion
valve
Probable cause: The expansion valve is stuck
closed
Replace the expansion valve (see page 21-80)
HVAC DTCs (see page 21-9)
Check the old expansion valve
for contamination. If
contaminants are found,
replace the A/C system
component that caused the
contamination
The temperature of the
liquid line is the same
on both sides of the
expansion valve, and
the evaporator coil or
suction line has heavy
condensation Probable cause: The expansion valve is stuck
open
Replace the expansion valve (see page 21-80)
HVAC DTCs (see page 21-9)
Check the old expansion valve
for contamination. If
contaminants are found,
replace the A/C system
component that caused the
contamination
Warm air comes out of
the vents, but
operation is normal
otherwise Probable cause: Compressor failure
Do the A/C system test (see page 21-99), and
correct any problems. If necessary, replace the
compressor (see page 21-83) HVAC DTCs (see page 21-9)
Add refrigerant oil depending
on the part you replaced
(see page 21-7)
Driver’s and
passenger’s side vent
temperatures vary by
more than 11 °C (20 °F) Probable causes: The recirculation control door
or the air mix door is malfunctioning
Do the following troubleshooting:
Recirculation control motor test (see page
21-74)
Air mix control motor test (see page 21-72) HVAC DTCs (see page 21-9)
Poor or loose connections at the
terminals
Insufficient heating 1. 2.
3.
4.
5.
6.
7.Check the coolant level (see page 10-7)
Check the radiator cap (see page 10-4)
Check the coolant temperature during normal
operation
Check the heater core inlet hose temperature:
If it is COLD, check for restrictions in the hose,
a damaged or leaking thermostat, or a
damaged or leaking water pump
If it is HOT, check for restrictions in the
heater core. Back flush or replace the heater
core
Do the air mix control motor test (see page
21-72)
Check the blower motor unit for obstructions
Check for air leaks around the ducts and vents HVAC DTCs (see page 21-9)
Damaged cylinder head gasket
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Climate Control Door Positions
21-22Climate Control
System Description (cont’d)
HOT
COOL
(VENT)
(HEAT/VENT)
(HEAT) DEFROSTER
DOOR
AIR MIX
DOOR
HEAT/VENT
DOOR
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Climate Control Unit Inputs and Outputs
Cavity Wire
color Terminal
name Description Signal
21-24Climate Control
System Description (cont’d)
CLIMATE CONTROL UNIT 32P CONNECTOR
1 GRY ILL Power source for illumination With lighting switch ON: battery
voltage
2 BRN RrDEF Ry Drives rear window defogger relay
3 LT GRN IG2 IG2 power source With ignition switch ON (II): battery voltage
5 BLK GND Ground for climate control unit (G504)
6 RED ACS Outputs A/C ON signal
7 BLK S5V Outputs sensor 5V With ignition switch ON (II): about 5V
8 BRN Teva Detects evaporator temperature sensor signal
9 LT BLU M-COOL Drives air mix control motor COOL side Drive on COOL side: 7 V 15 V
10 WHT M-VENT Drives mode control motor VENT side Drive on VENT side: about 14.5 V
11 PNK M-HOT Drives air mix control motor HOT side Drive on HOT side: 7 V 15 V
12 GRN M-DEF Drives mode control motor DEF side Drive on DEF side: about 14.5 V
13 YEL BLW-G Outputs power transistor gate
14 BLU BLW-V Feedback signal of power transistor drain voltage
15 ORN REC Drives recirculation control motor REC side Drive on REC side: about 14.5 V
16 PUR FRS Drives recirculation control motor FRESH side Drive on FRESH side: about 14.5 V
18 RED ILL Ground for illumination
19 RED S-COM Ground exclusive for sensor
20 BLU MODE 4 Inputs mode motor signal 4
Wire side of female terminals
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21-27
RED
(With navigation system)
30 29 28
F3 F2 F4
NAVIGATION UNIT
CLKSO
BLU
RED
YEL 12 V
PURBLU
LT GRN
BRN
BRN
BLU
REAR WINDOW DEFOGGER RELAY DASH LIGHTS
BRIGHTNESS
CONTROLLER
GRY
1
RED 18
2
32 6
PNK 5
3
19 20 21
22 23
12 10 15 16
31 9 11 27 7 24 8 26 25 13 14
G5041
1 2 2
2
YEL
RED REDPNK
LT BLU
RED RED
WHT BLU
LT GRN
PUR
ORN GRN RED
YEL
ORN GRY
PNK
LT BLU YEL
BLU
4
2
1
S-COM
REC
FRS FRD-P S5V
S-COM
M-DEF
M-VENT
MODE 4 MODE 2
MODE 3 MODE 1
2 2 1
BRN
PUR BLK
RED BLK
5V
1
3 5
4 6 1 2
3 5 BLK
CLIMATE CONTROL UNIT 1
2 1
RED
G401GRN
3
WHT
5
3
1
2
BLK
S5V
AMD-P
M-HOT
M-COOLS-COM WHT
7 7
7
DRIVING
CIRCUIT BLOWER
MOTOR
POWER
TRANSISTOR
OUTSIDE AIR
TEMPERATURE SENSOR
AIR MIX
CONTROL
MOTOR
RECIRCULATION
CONTROL
MOTOR
MODE
CONTROL
MOTOR
IN-CAR
TEMPERATURE SENSOR
EVAPORATOR
TEMPERATURE SENSOR
SUNLIGHT SENSOR
No. 14 (7.5 A)
In the under-dash
fuse/relay box SI
: CAN line
B-CAN
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21-6721-67
In-car Temperature Sensor Test In-car Temperature Sensor Replacement
IN-CAR TEMPERATURE SENSOR
10
14 0
32 10
5020
68 30
86
40 °C
104 °F
TEMPERATURE
RESISTANCE
(k )
12
11
10
98
7
6
5
4 3
2
1 A
B
1. Remove the in-car temperature sensor (see page21-67).
2. Test the in-car temperature sensor while holding it in front of the dashboard center vent.
 Measure the resistance with the system set to Max Cool.
 Measure the resistance with the system set to Max Hot.
3. Compare the resistance reading between terminals No. 1 and No. 2 of the in-car temperature sensor
with the specifications shown in the graph; the
resistance should be within the specifications.
4. If the resistance is not as specified, replace the in-car temperature sensor (see page 21-67). 1. Remove the center panel:
 ’06-08 models with navigation (see page 23-155)
 ’06-08 models without navigation (see page23-80)
 ’09 model with navigation (see page 23-355)
 ’09 model without navigation (see page 23-256)
2. Remove the self-tapping screw and the in-car temperature sensor (A) from the center panel (B).
3. Install the sensor in the reverse order of removal. Be sure to connect the air hose securely.
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21-7321-73
Mode Control Motor Test Mode Control Motor Replacement
MODE CONTROL MOTOR
A
B
A B
NOTE: Before testing, check for HVAC DTCs (see page
21-9).
1. Disconnect the 7P connector from the mode control motor.
Incorrectly applying power and ground to
the mode control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to terminal No. 1 of the mode control motor, and ground terminal No. 2;
the mode control motor should run smoothly, and
stop at Vent. If it doesn’t, reverse the c onnections;
the mode control motor should run smoothly, and
stop at Defrost. When the mode control motor
stops running, disconnect battery power
immediately.
3. If the mode control motor did not run in step 2, remove it, then check the mode control linkage and
doors for smooth movement.
 If the linkage and doors move smoothly, replace the mode control motor (see page 21-73).
 If the linkage or doors stick or bind, repair them as needed.
 If the mode control motor runs smoothly, go to step 4.
4. Use a digital multimeter with an output of 1 mA or less at the 20 k range. With the mode control
motor running as in step 2, check for continuity
between terminals No. 3, 4, 5, and 6 and terminal
No. 7 individually. There should be continuity for a
moment at each terminal as the motor moves past
the switch’s terminal.
5. If there is no continuity for a moment at each terminal, replace the mode control motor (see page
21-73). 1. Remove the glove box (see page 20-104).
2. Remove the wire harness clip (A), the self-tapping
screws, and the passenger’s heater duct (B).
3. Disconnect the 7P connector (A) from the mode control motor (B). Remove the self-tapping screws
and the mode control motor from the heater unit.
4. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
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Special Tools Required
21-86
Climate Control
A/C Compressor Clutch Overhaul
25.5 N·m
(2.6 kgf·m, 18.8 lbf·ft)
A
B A
B
A
B A
B
C
D 1.3 N·m
(0.1 kgf·m, 1.0 lbf·ft)
A/C clutch holder, Robinair 10204 or Kent-Moore
J37872, or Honda Tool and Equipment KMT- J33939,
commercially available
1. Remove the center nut while holding the armature plate (A) with a commercially available A/C clutch
holder (B).
2. Remove the armature plate (A) and shim(s) (B), taking care not to lose the shim(s). If the clutch
needs adjustment, increase or decrease the
number and thickness of shims as necessary, then
reinstall the armature plate, and recheck its
clearance (see page 21-85).
NOTE: The shims are available in four thicknesses:
0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm. 3. If you are replacing the field coil, remove the snap
ring (A) with snap ring pliers, then remove the rotor
pulley (B). Be careful not to damage the rotor pulley
and A/C compressor.
4. Remove the bolt and holder (A), then disconnect the field coil connector (B). Remove the snap ring
(C)withsnapringpliers,thenremovethefieldcoil
(D). Be careful not to damage the field coil and A/C
compressor.
5. Reassemble the clutch in the reverse order of disassembly, and note these items:
 Install the field coil with the wire side facing down, and align the boss on the field coil with the
hole in the A/C compressor.
 Clean the rotor pulley and A/C compressor sliding surfaces with contact cleaner or other
non-petroleum solvent.
 Install new snap rings, note the installation direction, and make sure they are fully seated in
the groove.
 Make sure that the rotor pulley turns smoothly after it’s reassembled.
 Route and clamp the wires properly or they can be damaged by the rotor pulley.
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21-8921-89
Receiver/Dryer Desiccant
Replacement
A 6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft) A
B
C
8. Remove the A/C condenser (A) by lifting it up. Be careful not to damage the radiator and A/C
condenser fins when removing the A/C condenser.
9. Install the A/C condenser in the r everse order of
removal, and note these items:
 If you’re installing a new A/C condenser, add refrigerant oil (SP-10) (see page 21-7).
 Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
 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 the refrigerant oil
contacts the paint, wash it off immediately.
 Charge the system (see page 21-92).
 Adjust the hood latch (see page 20-152). NOTE: Install the receiver/dryer as quickly as possible
to prevent the system from absorbing moisture from
the air.
1. Remove the A/C condenser (see page 21-88).
2. Remove the bolts from the A/C condenser, then remove the receiver/dryer (A), the bracket (B), and
the O-rings (C).
3. Install the receiver/dryer in the reverse order of removal. Replace the O-rings with new ones, and
apply a thin coat of refrigerant oil (SP-10) before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
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21-8921-89
Receiver/Dryer Desiccant
Replacement
A 6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft) A
B
C
8. Remove the A/C condenser (A) by lifting it up. Be careful not to damage the radiator and A/C
condenser fins when removing the A/C condenser.
9. Install the A/C condenser in the r everse order of
removal, and note these items:
 If you’re installing a new A/C condenser, add refrigerant oil (SP-10) (see page 21-7).
 Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
 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 the refrigerant oil
contacts the paint, wash it off immediately.
 Charge the system (see page 21-92).
 Adjust the hood latch (see page 20-152). NOTE: Install the receiver/dryer as quickly as possible
to prevent the system from absorbing moisture from
the air.
1. Remove the A/C condenser (see page 21-88).
2. Remove the bolts from the A/C condenser, then remove the receiver/dryer (A), the bracket (B), and
the O-rings (C).
3. Install the receiver/dryer in the reverse order of removal. Replace the O-rings with new ones, and
apply a thin coat of refrigerant oil (SP-10) before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
08/08/21 14:43:49 61SNR030_210_0090
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