ACURA CSX 2006 Service Repair Manual

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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?
08/08/21 14:43:32 61SNR030_210_0063
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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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21-65
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?
08/08/21 14:43:34 61SNR030_210_0066
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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?
08/08/21 14:43:34 61SNR030_210_0067
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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.
08/08/21 14:43:34 61SNR030_210_0068
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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.
08/08/21 14:43:35 61SNR030_210_0069
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21-6921-69
Sunlight Sensor Test Sunlight Sensor Replacement
REDPUR
A
A
B
1. Remove the sunlight sensor (A) from thedashboard (see page 21-69).
2. Turn the ignition switch to ON (II). Measure the voltage between the terminals with the ( ) probe
on terminal No. 2 and the ( ) probe on terminal
No. 1 with the connector connected.
NOTE: The voltage readings will not change under
the light of a flashlight or a fluorescent lamp.
Voltage should be: 3.6 3.7 V or more with the sensor out of direct sunlight.
 3.3 3.5 V or less with the sensor in direct sunlight.
3. If the voltage is not as specified, replace the sunlight sensor (see page 21-69). 1. Remove the gauge control module (SPEEDO)
(see page 22-277).
2. Remove the sunlight sensor (A) from the dashboard with a flat-tip screwdriver, then
disconnect the connector (B). Be careful not to
damage the sensor and the dashboard.
3. Install the sensor in the reverse order of removal.
08/08/21 14:43:35 61SNR030_210_0070
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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
08/08/21 14:43:36 61SNR030_210_0071
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