ACURA CSX 2006 Service Repair Manual

21-98Climate Control
A/C System Noise Check (cont’d)
5. Turn the ignition switch to LOCK (0), and check the
drive belt for excessive wear, oil contamination,
improper routing, or a faulty belt tensioner
(see page 4-30). Correct any problems found. Start
the engine, run the A/C system, and check if the
noise is coming from the drive belt, the belt
tensioner or any of the pulleys. Repair or replace
any faulty components.
6. Listen for noises coming from the A/C lines, the A/C hoses, the condenser, the evaporator, the receiver/
drier, or the expansion valve, and check these
items:
 Noises caused by A/C components touching other components or the body. Reroute or
insulate the A/C component(s) as needed, and
recheck for noise.
 Loose, damaged or excessively worn A/C components or mounting hardware. Repair or
replace the faulty component(s) or hardware, and
recheck for noise.
 A moaning noise coming from the A/C suction line. If there is a moaning noise, check the
system refrigerant charge (see page 21-92). If the
refrigerant charge is OK, replace the receiver/
dryer.
7. Check the operation of the A/C compressor clutch:  Make sure compressor clutch engages withoutslipping. If the clutch does not engage,
troubleshoot the A/C compressor clutch circuit
(see page 21-62). If the compressor clutch slips,
replace the complete clutch assembly (see page
21-86).
 Make sure the compressor clutch disengages. If the clutch does not disengage, do the A/C
compressor clutch check (see page 21-85). If the
compressor clutch is OK, replace the A/C
compressor (see page 21-83).
 Make sure the compressor clutch cycles normally. If the compressor clutch is cycling rapidly, the
A/C system is probably low on refrigerant due to
a leak. Do the refrigerant leak check (see page
21-93). If the refrigerant charge is OK, and there
are no leaks, troubleshoot the A/C compressor
clutch circuit. 8. Listen with a stethoscope for noises coming from
the A/C compressor, and check these items:
 The noise changes when the compressor clutch disengages. If the noise does not change when
the A/C compressor disengages, the noise may
be caused by an engine-related component.
Probe the engine area with a stethoscope to
pinpoint the noise.
 The A/C system operating pressures are normal. If the system pressures are abnormal,
troubleshoot the problem using the pressure test
table in the A/C system check (see page 21-99).
Correct the pressure-related problem(s), and
recheck for noise.
 The compressor hose connections, mounting brackets, and fasteners are in good condition. If
any of these components are loose, damaged, or
excessively worn, repair or replace the faulty
component(s), and recheck for noise. If these
components are in good condition, and the noise
is still present, replace the A/C compressor
(see page 21-83).
08/08/21 14:44:54 61SNR030_210_0099
ProCarManuals.com
DYNOMITE -2009-

Î
(#'

)
Performance Test
21-99
A/C System Test
A
B
 Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat.
 Be careful when connecting service equipment.
 Do not breathe refrigerant or vapor.
The performance test will help determine if the A/C
system is operating within specifications.
NOTE:  If accidental system discharge occurs, ventilate the work area before resuming service.
 Additional health and safety information may be obtained from the refrigerant and lubricant
manufacturers.
1. Do the A/C system inspection (see page 21-6), and correct any problems found.
2. Connect an R-134a refrigerant recovery/recycling/ charging station to the high-pressure service port
and the low-pressure service port, following the
equipment manufacturer’s instructions.
3. Determine the relative humidity and air temperature.
4. Open the glove box. Remove the glove box stop on each side, then let the glove box hang down
(see page 20-104).
5. Insert a thermometer (A) in the center vent. 6. Place a thermometer (B) near the blower unit’s
recirculation inlet duct.
7. Test conditions:  Move the vehicle out of direct sunlight and let itcool down to the surrounding (ambient)
temperature. If necessary, wash the vehicle to
cool it down more quickly.
 The ambient temperature must be at least 16 °C (60 °F).
 Open the hood.
 Open the front doors.
 Set the temperature control dial to Max Cool, the mode control switch to Vent, and the
recirculation control switch to Recirculate.
 Turn the A/C switch ON and the fan switch to Max.
 Hold the engine speed at 1,500 rpm.
 No driver or passengers in the vehicle.
8. Inspect the A/C components for the following conditions:
 A/C compressor clutch not engaged.
 Abnormal frost areas.
 Unusual noises.
If you observe any of these conditions, refer to the
Symptom Troubleshooting Index.
9. After running the air conditioning for 10 minutes under the above test conditions, read the delivery
temperature from the thermometer in the center
vent, the intake temperature near the blower unit,
and the discharge (high) and suction (low)
pressures on the A/C gauges.
(cont’d)
08/08/21 14:44:55 61SNR030_210_0100
ProCarManuals.com
DYNOMITE -2009-

Î
21-100Climate Control
A/C System Test (cont’d)
80 %
HUMIDITY
LEVEL
°C
(°F)
49
(120)
°C
(°F)
33
(92)
25
(77)
14
(57)
VENT
(DELIVERY)
TEMPERATURE
35
(95)
Ambient (Intake) Temperature vs. Vent (Delivery) Temperature
AMBIENT (INTAKE) TEMPERATURE 30 %
28
(32)
17
(62)
8
(47) 31
(87)
22
(72) 19
(67)
11
(52)
6
(42)
3
(37)
0
(32) 46
(115)
43
(110)
41
(105)
38
(100)
32
(90)
29
(85)
27
(80)
24
(75)
21
(70)
18
(65)
16
(60)
10. To complete the vent (delivery)/ambient air (intake) temperature chart:
 Mark the vent (delivery) temperature on the vertical line.
 Mark the ambient air (intake) temperature on the bottom line.
 Draw a vertical line from the ambient air (intake) temperature mark.
 Draw a horizontal line from the vent (delivery) temperature mark unit it intersects the vertical line.NOTE: The low side and intake temperatures should intersect in the shaded area within about 10 % of the
measured humidity level. Any measurements outside the line may indicate the need for further inspection.
08/08/21 14:44:55 61SNR030_210_0101
ProCarManuals.com
DYNOMITE -2009-

Î
21-101
80 %HUMIDITY
LEVEL
°C
(°F)
49
(120)
psi
(kPa)
350
(2413)
275
(1896)
175
(1207)
HIGH SIDE
(DISCHARGE)
PRESSURE
35
(95)
Ambient (Intake) Temperature vs. High Side (Discharge) Pressure
AMBIENT (INTAKE) TEMPERATURE 30 %
300
(2068)
200
(1379)
125
(862) 325
(2241)
250
(1724)
225
(1551)
150
(1034)
100
(689)
75
(517) 0 46
(115)
43
(110)
41
(105)
38
(100)
32
(90)
29
(85)
27
(80)
24
(75)
21
(70)
18
(65)
16
(60)
11. To complete the high side (discharge pressure)/ambient air (intake) temperature chart:
 Mark the high side (discharge pressure) temperature on the vertical line.
 Mark the ambient air (intake) temperature on the bottom line.
 Draw a vertical line from the high side (discharge pressure) temperature mark.
 Draw a horizontal line from the vent (delivery) temperature mark unit it intersects the vertical line.NOTE: The low side and intake temperatures should intersect in the shaded area within about 10 % of the
measured humidity level. Any measurements outside the line may indicate the need for further inspection.
(cont’d)
08/08/21 14:44:56 61SNR030_210_0102
ProCarManuals.com
DYNOMITE -2009-

Î
21-102Climate Control
A/C System Test (cont’d)
80 %
HUMIDITY
LEVEL
°C
(°F)
49
(120)
psi
(kPa)
60
(414)
45
(310)
25
(172)
LOW SIDE
(SUCTION)
PRESSURE
35
(95)
Ambient (Intake) Temperature vs. Low Side (Suction) Pressure
AMBIENT (INTAKE) TEMPERATURE 30 %
50
(345)
30
(207)
15
(103) 55
(379)
40
(276) 35
(241)
20
(138)
10
(69) 5
(34)0 46
(115)
43
(110)
41
(105)
38
(100)
32
(90)
29
(85)
27
(80)
24
(75)
21
(70)
18
(65)
16
(60)
12. To complete the low side (suction pressure)/ambient air (intake) temperature chart:
 Mark the low side (suction pressure) temperature along the vertical line.
 Mark the ambient air (intake) temperature along the bottom line.
 Draw a vertical line from the ambient air (intake) temperature mark.
 Draw a horizontal line from the vent (delivery) temperature mark unit it intersects the vertical line.NOTE: The low side and intake temperatures should intersect in the shaded area within about 10 % of the
measured humidity level. Any measurements outside the line may indicate the need for further inspection.
08/08/21 14:44:56 61SNR030_210_0103
ProCarManuals.com
DYNOMITE -2009-

Pressure Test
Test results Related symptoms Probable causeRemedy
21-103






Suction and
discharge pressures
are normal
Warm air from the vents. The A/C system
contains too much
refrigerant oil.
The air mix door is
not operating
properly.Recover refrigerant (see page 21-90)
and evacuate the system (see page
21-91). Adjust the amount of oil in
the system, then recharge the
system (see page 21-92).
Check air mix door operation
(see page 21-72), and repair as
needed.
Suction and
discharge pressures
are roughly equal
and steady The suction and
discharge pressures
equalize when the engine
is revved. The A/C compressor
clutch or the drive
belt is slipping, or the
compressor shaft
seal is leaking.Check whether the A/C compressor
clutch or the drive belt is slipping.
If the drive belt is slipping, replace
the drive belt (see page 4-31). Also
inspect the drive belt auto-tensioner
(see page 4-31).
If the A/C compressor clutch is
slipping, replace it (see page 21-86).
Check the A/C compressor shaft seal.
If it’s leaking, replace the A/C
compressor (see page 21-83).
Suction and
discharge pressures
are roughly equal but
fluctuate Suction and discharge
pressures fluctuate while
running. Pressures
equalize as soon as the
A/C compressor
disengages. The compressor
discharge valve or
the compressor
gasket is faulty.
Replace the A/C compressor (see page
21-83).
Suction and
discharge pressures
are roughly equal
and abnormally low The suction and
discharge pressures do
not change during
continued operation. The A/C system is
undercharged.
Recover refrigerant (see page 21-90),
then do the refrigerant leak check
(see page 21-93). Repair any leaks,
then recharge the system (see page
21-92).
Suction and
discharge pressures
are abnormally high,
but normalize when
the condenser is
cooled The suction pressure
decreases when cool
water is sprayed on the
A/C condenser.
The A/C system is
overcharged.
Recover refrigerant (see page 21-90),
evacuate the system (see page 21-91),
and recharge the system to
specifications (see page 21-92).
(cont’d)
08/08/21 14:44:56 61SNR030_210_0104
ProCarManuals.com
DYNOMITE -2009-

Test results Related symptoms Probable causeRemedy
21-104Climate Control
A/C System Test (cont’d)














Suction and
discharge pressures
are abnormally high,
and refrigerant line
temperatures are
abnormal
The high pressure
vapor line to the
condenser is too hot.
The low pressure liquid
line from the
expansion valve is not
cold.
There is an abrupt
temperature drop
along a refrigerant line,
or in the condenser or
evaporator.The A/C system
refrigerant flow is
restricted.
Replace the restricted line or
component.
Suction and
discharge pressures
are abnormally high,
but drop rapidly
when the
compressor
disengages After stopping the A/C
compressor, the
discharge pressure
quickly drops about
196 kPa (28 psi), then
falls gradually.
The input and output
temperatures at the
expansion valve are
not similar.There is excess air in
the A/C system.
Recover refrigerant (see page 21-90),
evacuate the system (see page 21-91),
and recharge the system (see page
21-92).
Suction and
discharge pressures
are abnormally high,
and there is little or
no airflow through
the A/C condenser The condenser
and/or radiator fins
are clogged.
The condenser fins
are damaged.
The condenser
and/or radiator
fans are not
working properly.Clean debris from the condenser
and/or radiator fins.
Comb the condenser fins to repair
any damage.
Troubleshoot the A/C condenser fan
and/or the radiator fan circuit(s).
The suction pressure
is high and the
discharge pressure is
low. Both pressures
are steady The liquid line
temperature is similar
on both sides of
expansion valve.
System pressures do
not vary at a steady
engine speed.The expansion valve
is stuck open.
Replace the expansion valve (see page
21-80).
The suction pressure
is low, the discharge
pressure is high, and
the refrigerant
temperature changes
abnormally
somewhere in the
system The high pressure
liquid line going into
the expansion valve is
cold.
There is an abrupt
temperature drop in
the line between the
compressor and the
condenser, or in the
line between the
condenser and the
expansion valve.The A/C system
refrigerant flow is
restricted.
Replace the restricted line or
component.
08/08/21 14:44:56 61SNR030_210_0105
ProCarManuals.com
DYNOMITE -2009-

Test results Related symptoms Probable causeRemedy
21-105






The suction pressure
is high, the discharge
pressure is low, and
there are particle
contaminants in the
refrigerant lines
The expansion valve
and/or the compressor
discharge hose are
contaminated with metal
flakes or desiccant
particles. The A/C compressor
is malfunctioning.
Replace the A/C compressor (see page
21-83). If the system is contaminated
with desiccant, replace the receiver/
dryer (see page 21-89).
The suction pressure
is high, the discharge
pressure is low, and
the pressures quickly
change when the A/C
disengages The discharge and
suction pressures
equalize soon after the
A/C compressor stops.
The A/C compressor
seal is faulty.
Replace the A/C compressor (see page
21-83).
Suction and
discharge pressures
are both low and
none of the
refrigerant lines are
cold There is no frost on the
expansion valve, and the
low-pressure liquid line is
not cold.
The A/C system has a
leak (very low
refrigerant charge).
Do the refrigerant leak check
(see page 21-93), repair any leaks, and
recharge the A/C system (see page
21-92).
Suction and
discharge pressures
are both low, and the
expansion valve or
the suction line is
abnormally cold The temperature
around the expansion
valve is too low
compared to the
temperature around
the receiver/dryer.
The low pressure
(suction) hose/line is
cooler than the
evaporator.The discharge hose/
line is clogged or
kinked, which is
restricting refrigerant
flow.
The suction hose/line
is clogged or kinked,
which is restricting
refrigerant flow.
Repair or replace the faulty A/C line
(see page 21-8).
Initially, the suction
and discharge
pressure are normal,
but both become
abnormally low
during operation During extended
operation, the air flow
from the vents decreases.
The evaporator is
freezing up.
Run the fan with A/C compressor off to
warm the evaporator, then test the
evaporator temperature sensor
(see page 21-70). If necessary, replace
the evaporator temperature sensor.
Suction and
discharge pressures
are both low and
there are abnormal
temperature changes
at the expansion
valve During extended
operation, warm air
comes out of the vents,
the suction pressure
decreases, and heavy
frost occurs on the low
pressure liquid line.
The low pressure liquid
line is cold at the
expansion valve, but
warm after the valve.
There is frost on the
expansion valve.The expansion valve
is stuck closed.
Replace the expansion valve
(see page 21-80), and the receiver/
dryer (see page 21-89).
Check the old expansion valve for
contamination. If contaminants are
found, replace the component that
caused the contamination.
(cont’d)
08/08/21 14:44:57 61SNR030_210_0106
ProCarManuals.com
DYNOMITE -2009-

Test results Related symptoms Probable causeRemedy
21-106Climate Control
A/C System Test (cont’d)


The discharge
pressure is low, the
suction pressure is
extremely low, and
the expansion valve
outlet is abnormally
warm
There is no frost on the
expansion valve outlet,
and the liquid line
temperature changes
significantly across the
expansion valve.
There is excessive
moisture in the A/C
system.
Recover refrigerant (see page 21-90),
then replace the receiver/dryer
(see page 21-89). Evacuate the system
(see page 21-91), and recharge the
system (see page 21-92).
The discharge
pressure is low, the
suction pressure is
extremely low, and
the suction line is
abnormally cold There is frost on the line
from the evaporator to
the compressor.
The evaporator is
internally
contaminated or
plugged.Recover refrigerant (see page 21-90),
then replace the evaporator. Evacuate
the system (see page 21-91), and
recharge the system (see page 21-92).
The discharge
pressure is low, the
suction pressure is
extremely low, and
the refrigerant
temperature doesn’t
change going
through the
expansion valve There is no frost on the
expansion valve, and
the low pressure liquid
line is not cold.
The liquid line
temperatures are
similar on both sides of
expansion valve.
The expansion valve
is faulty.
Replace the expansion valve (see page
21-80).
The discharge
pressure is low, the
suction pressure is
extremely low, and
the expansion valve
is abnormally cold There is frost on the
expansion valve.
Excessive moisture
in the system is
freezing the
expansion valve.Recover refrigerant (see page 21-90),
the replace the receiver/dryer
(see page 21-89). Evacuate the system
(see page 21-91), and recharge the
system (see page 21-92).
The discharge
pressure is low, the
suction pressure is
extremely low, and
the high pressure
liquid line is
abnormally cold There is frost on the line
from the receiver/dryer to
the expansion valve.
The receiver/dryer is
clogged.
Recover refrigerant (see page 21-90),
then replace the receiver/dryer
(see page 21-89). Evacuate the system
(see page 21-91), and recharge the
system (see page 21-92).
08/08/21 14:44:57 61SNR030_210_0107
ProCarManuals.com
DYNOMITE -2009-

(#'
/)
Body Electrical
Body Electrical..................................
..................................
Relay and Control Unit
Locations . 22-7
................
Connectors and Harnesses . 22-13
........................
........................
Fuse/Relay Boxes . 22-58
......................
......................
Power Distribution . 22-60
....................
....................
Ground Distribution . 22-64
Under-hood Fuse/Relay Box
Under-dash Fuse/Relay Box
Battery
Relays
Ignition Switch
Multiplex Integrated Control System Keyless/Power Door Locks/Security
System
Horns
Exterior Lights
Turn Signal/Hazard Warning Lights
Interior Lights.............................................. .....
..............................................
.....
Special Tools . 22-2
General Troubleshooting Information . 22-3
.......................... ..........................
Removal and Installation . 22-65
..........................
..........................
Removal and Installation . 22-66
.......................................................................................... .............
................................................
.......................................... .............
Battery Test
. 22-67
Battery Terminal Disconnection and Reconnection . 22-68
Battery Removal and Installation . 22-69
.......................................
.......................................
Power Relay Test . 22-70
............................................................. ..............................................
.............................................................
..............................................
Test
. 22-72
Replacement . 22-72
...................... .....
......................
...................................
.........................
..........................
.......................... .........................
............
................
.......................................... ................................
......................................... ......................
.....
......................
...................................
.........................
..........................
.......................... .........................
............
................
.......................................... ................................
.........................................
Component Location Index
. 22-73
General Troubleshooting Information . 22-74
DTC Troubleshooting Index . 22-77
System Description . 22-80
Troubleshooting-B-CAN System Diagnosis Test Mode A . 22-93
Troubleshooting-B-CAN System Diagnosis Test Mode B . 22-94
Troubleshooting-B-CAN System Diagnosis Test Mode C . 22-95
Troubleshooting-B-CAN System Diagnosis Test Mode D . 22-96
Troubleshooting-B-CAN System Diagnosis Test Mode 1 and
Test Mode 2 (Without the HDS) . 22-97
Sleep and Wake-up Mode Test . 22-99
Circuit Diagram . 22-100
DTC Troubleshooting . 22-102
MICU Input Test . 22-109 ......................
...................................
.......................................... ......................................................
.............................
......................................... ................................................
............................... ...............................
....................................... .................
......................
...................................
.......................................... ......................................................
.............................
......................................... ................................................
............................... ...............................
....................................... .................
Component Location Index
. 22-112
System Description . 22-114
Circuit Diagram . 22-116
DTC Troubleshooting . 22-120
Symptom Troubleshooting . 22-126
Tripped Sensor History . 22-130
MICU Input Test . 22-131
Door Lock Actuator Test . 22-137
Door Lock Knob Switch Test . 22-138
Door Lock Switch Test . 22-139
Door Key Cylinder Switch Test . 22-140
Trunk Lid Release Actuator Test . 22-141
Hood Switch Test . 22-141
Transmitter Test/Replacement . 22-142
......................
.......................................... ............................
....................................... ......................
.......................................... ............................
.......................................
Component Location Index
. 22-145
Circuit Diagram . 22-146
Horn Test/Replacement . 22-146
Horn Switch Test . 22-147
......................
.......................................... ................................
.........................................
........................................... ..............................
............................... ........
............................... .............................
.............................
................................
..................................... ............................... ........................................
.............
......................
.......................................... ................................
.........................................
........................................... ..............................
............................... ........
............................... .............................
.............................
................................
..................................... ............................... ........................................
.............
Component Location Index
. 22-148
Circuit Diagram . 22-150
DTC Troubleshooting . 22-157
MICU Input Test . 22-163
Combination Light Switch Test/ Replacement . 22-166
HID Bulb Replacement . 22-168
HID Unit Replacement . 22-169
HID Lamp System Troubleshooting . 22-170
Headlight Adjustment . 22-173
Headlight Replacement . 22-174
Fog Light Replacement . 22-175
Fog Light Adjustment . 22-176
Bulb Replacement . 22-177
Taillight Replacement . 22-179
Inner Taillight Replacement . 22-179
License Plate Light Replacement . 22-180
High Mount Brake Light Replacement . 22-180
Brake Pedal Position Switch Test . 22-181
......................
.......................................... ................................
.........................................
.................................. .......
......................
.......................................... ................................
.........................................
.................................. .......
Component Location Index
. 22-182
Circuit Diagram . 22-184
DTC Troubleshooting . 22-186
MICU Input Test . 22-188
Hazard Warning Switch Test/Replacement . 22-192
Side Turn Signal Light Replacement . 22-192
......................
..........................................
........................................... ...............
.......................... ............
.................... ................
...................... .............
......................
..........................................
........................................... ...............
.......................... ............
.................... ................
...................... .............
Component Location Index
. 22-193
Circuit Diagram . 22-194
Front Individual Map Light Test/ Replacement . 22-196
Ceiling Light Test/Replacement . 22-197
Trunk Light Replacement . 22-197
Ambient Light Test/Replacement . 22-198
Courtesy Light Replacement . 22-198
Glove Box Light Test/Replacement . 22-199
Vanity Mirror Light Test/Replacement . 22-199
Interior Light Switch Test/Replacement . 22-200
Trunk Lid Latch Switch Test . 22-200
Footwell Light Test/Replacement . 22-201
08/08/21 14:22:03 61SNR030_220_0002
ProCarManuals.com
DYNOMITE -2009-