climate control ACURA CSX 2006 Service Workshop Manual
[x] Cancel search | Manufacturer: ACURA, Model Year: 2006, Model line: CSX, Model: ACURA CSX 2006Pages: 2893, PDF Size: 67.66 MB
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21-60Climate Control
A/C Condenser Fan High Speed Circuit Troubleshooting
A/C CONDENSER FAN RELAY 4P SOCKET
JUMPER WIRE
BLU
A/C CONDENSER FAN RELAY 4P SOCKET
A/C CONDENSER FAN RELAY 4P SOCKET
NOTE:
Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom
troubleshooting index.
Before performing symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Check the No. 6 (20 A) and No. 15 (7.5 A) fuses in the under-hood fuse/relay box.
Go to step 2.
Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 6 (20 A) and
No.15(7.5A)fusescircuit.
2. Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it (see page
22-70).
Go to step 3.
Replace the A/C condenser fan relay.
3. Measure the voltage between the A/C condenser fan relay 4P socket terminal No. 1 and body ground.
Go to step 4.
Replace the under-hood fuse/relay box
(see page 22-65). 4. Connect the A/C condenser fan relay 4P socket
terminals No. 1 and No. 2 with a jumper wire.
Go to step 5.
Replace the under-hood fuse/relay box
(see page 22-65).
5. Disconnect the jumper wire.
6. Turn the ignition switch to ON (II).
7. Measure the voltage between the A/C condenser fan relay 4P socket terminal No. 4 and body ground.
Go to step 8.
Go to step 14.
Ar e t he f uses OK ?
Is the relay OK ?
Is there battery voltage? Does t he A/ C cond enser f an r un on hi gh?
Is there battery voltage?
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21-62
Climate Control
A/C Compressor Clutch Circuit Troubleshooting
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
NOTE:
It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine
coolant temperature, or hard acceleration.
Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the
symptom troubleshooting index.
Before doing any symptom troubleshooting, check for powertrain DTCs (see page 11-3).
1. Check the No. 20 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 36 (10 A) fuse in the
under-dash fuse/relay box.
Go to step 2.
Replace the fuses and recheck. If the fuses
blow again, check for a short in the No. 20 (7.5 A)
and No. 36 (10 A) fuses circuit.
2. Connect the HDS to the DLC.
3. Start the engine.
4. Turn on the A/C.
5. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
ECT Sensor 2 80 100 °C (176 212 °F)
TP Sensor About 0.5 V at idle
RPM More than 670
A/C Switch ON
A/C Clutch ON
A/C Pressure
Sensor 196 455 kPa (28 455 psi)
Go to step 6.
Troubleshoot the value that is not within the
specifications. 6. Turn the ignition switch to LOCK (0).
7. Remove the A/C compressor clutch relay from the
under-hood fuse/relay box, and test it (see page
22-70).
Go to step 8.
Replace the A/C compressor clutch relay.
8. Measure the voltage between the A/C compressor clutch relay 4P socket terminal No. 1 and body
ground.
Go to step 9.
Replace the under-hood fuse/relay box
(see page 22-65).
Ar e t he f uses OK ?
Are all the values within specif ications? Is the relay OK ?
Is there battery voltage?
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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 ?
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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 ?
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21-65
BRN
CLIMATE CONTROL UNIT 32P CONNECTOR BRN
CLIMATE CONTROL UNIT 32P CONNECTOR
7. Reconnect the climate control unit 32P connector.
8. Turn the ignition switch to ON (II).
9. Check the blower motor operates at all speeds.
Go to step 10.
Repair the problem in the blower motor
circuit.
10. Turn the ignition switch to LOCK (0).
11. Disconnect the climate control unit 32P connector.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between the climate control unit 32P connector terminal No. 6 and body ground.
Go to step 14.
Go to step 18. 14. Turn the ignition switch to LOCK (0).
15. Reconnect the climate control unit 32P connector.
16. Set the A/C button and fan control switch ON, then
turn the ignition switch to ON (II).
17. Measure the voltage between the climate control unit 32P connector terminal No. 6 and body ground.
Substitute a known-good MICU and recheck.
If the symptom goes away, replace the original
MICU (see page 22-66).
Check for loose wires or poor connections at
the climate control unit 32P connector. If
connections are good, substitute a known-good
climate control unit and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
(cont’d)
Wire side of female terminals Wire side of female terminals
Does t he bl ow er mot or oper at e at al l speed s?
Is there battery voltage? Is t her e 0.5 V or l ess?
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21-66Climate Control
A/C Signal Circuit Troubleshooting (cont’d)
A/C COMPRESSOR CLUTCH 3P CONNECTOR
GRN/RED RED/BLK
A/C COMPRESSOR CLUTCH 3P CONNECTOR BRN
CLIMATE CONTROL UNIT 32P CONNECTOR
18. Turn the ignition switch to LOCK (0).
19. Disconnect the A/C compressor clutch 3P connector.
20. Turn the ignition switch to ON (II).
21. Measure the voltage between the A/C compressor
clutch 3P connector terminal No. 1 and body
ground.
Go to step 22.
Repair open in the wire between the A/C
compressor and the MICU. If the wire is OK,
substitute a known-good MICU and recheck. If the
symptom goes away, replace the original MICU
(see page 22-66).
22. Test the A/C compressor thermal protector (see page 21-85).
Go to step 23.
Replace the A/C compressor thermal
protector (see page 21-87). 23. Check for continuity between the climate control
unit 32P connector terminal No. 6 and the A/C
compressor clutch 3P connector terminal No. 3.
Check for loose wires or poor connections at
the climate control unit 32P connector and at the
A/C compressor clutch 3P connector.
Repair open in the wire between the climate
control unit and A/C compressor.
Wire side of female terminals Wire side of female terminalsWire side of female terminals
Is there battery voltage?
I s t he A/ C compr essor t her mal pr ot ect or OK ? Is there continuity?
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21-6821-68 Climate Control
Outside Air Temperature Sensor
Test
Outside Air Temperature Sensor
Replacement
OUTSIDE AIR 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 C
1. Remove the outside air temperature sensor
(see page 21-68).
2. Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor,
and check for a change in resistance.
3. Compare the resistance reading between terminals No. 1 and No. 2 of the outside air 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 outside air temperature sensor (see page 21-68). 1. Remove the front grille cover (see page 20-163).
2. Lift the tab (A) to release the lock, then remove the
outside air temperature sensor (B) from the bracket.
Disconnect the 2P connector (C) from the outside
air temperature sensor.
3. Install the sensor in the reverse order of removal.
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21-70 Climate Control
Evaporator Temperature Sensor Test
EVAPORATOR TEMPERATURE SENSOR
40
30
20
10
RESISTANCE
(k )
10
5020
6830 °C
86 °F
TEMPERATURE
0
32
1. Remove the evaporator core and the evaporator
temperature sensor (see page 21-78).
2. Dip the sensor in ice water, and measure the resistance between its terminals.
3. Then pour warm water on the sensor, and check for a change in resistance. 4. Compare the resistance readings with the
specifications shown in the graph; the resistance
should be within the specifications.
5. If the resistance is not as specified, replace the evaporator temperature sensor (see page 21-78).
Terminal side of male terminals
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Max Cool: About 0.5 V
Max Hot: About 4.5 V
21-7221-72 Climate Control
Air Mix Control Motor Test
Air Mix Control Motor Replacement
AIR MIX CONTROL MOTOR
B
A
NOTE: Before testing, check for HVAC DTCs (see page
21-9). 1. Disconnect the 7P connector from the air mix control motor.
Incorrectly applying power and ground to
the air mix control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to terminal No. 1 of the air mix control motor, and ground terminal No. 2; the
air mix control motor should run, and stop at Max
Hot. If it doesn’t, reverse the connections; the air
mix control motor should run, and stop at Max Cool.
When the air mix control motor stops running,
disconnect battery power immediately.
3. If the air mix control motor did not run in step 2, remove it, then check the air mix control linkage
and door for smooth movement.
If the linkage and door move smoothly, replace the air mix control motor (see page 21-72).
If the linkage or door sticks or binds, repair them as needed.
If the air mix control motor runs smoothly, go to step 4.
4. Measure the resistance between terminals No. 5 and No. 7. It should be between 4.2 to 7.8 k .
5. Reconnect the air mix control motor 7P connector, then turn the ignition switch to ON (II).
6. Using the backprobe set, measure the voltage between terminals No. 3 and No. 7.
7. If either the resistance or voltage readings are not as specified, replace the air mix control motor
(see page 21-72). 1. Remove the driver’s dashboard undercover
(see page 20-103).
2. Disconnect the 7P connector (A) from the air mix control motor (B). Remove the self-tapping screws
and the air mix control motor from the heater unit.
3. 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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Recirculate: About 4.0 V
Fresh: About 1.0 V
21-7421-74 Climate Control
Recirculation Control Motor Test Recirculation Control Motor
Replacement
RECIRCULATION CONTROL MOTOR
A
B
NOTE: Before testing, check for HVAC DTCs (see page
21-9). 1. Disconnect the 7P connector from the recirculation control motor.
Incorrectly applying power and ground to
the recirculation control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to terminal No. 1 of the recirculation control motor, and ground terminal
No. 2; the recirculation control motor should run,
and stop at Recirculate. If it doesn’t, reverse the
connections; the recirculation control motor should
run, and stop at Fresh. When the recirculation
control motor stops running, disconnect battery
power immediately.
3. If the recirculation control motor did not run in step 2, remove it, then check the recirculation control
linkage and door for smooth movement.
If the linkage and door move smoothly, replace the recirculation control motor (see page 21-74).
If the linkage or door sticks or binds, repair them as needed.
If the recirculation control motor runs smoothly, go to step 4.
4. Measure the resistance between terminals No. 5 and No. 7. It should be between 4.2 to 7.8 k .
5. Reconnect the recirculation control motor 7P connector, then turn the ignition switch to ON (II).
6. Using the backprobe set, measure the voltage between terminals No. 3 and No. 7.
7. If either the resistance or voltage readings are not as specified, replace the recirculation control motor
(see page 21-74). 1. Remove the glove box (see page 20-104) and the
kick panel (see page 20-66).
2. Disconnect the 7P connector (A) from the recirculation control motor (B). Remove the self-
tapping screws and the recirculation control motor
from the blower unit.
3. 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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