2006 ACURA CSX climate control



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21-56Climate Control
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
RADIATOR FAN RELAY 4P SOCKET
RADIATOR FAN RELAY 4P SOCKET
JUMPER WIRE
BRN
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. 7 (20 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. 7 (20 A) and
No. 36 (10 A) fuses circuit.
2. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see page 22-70).
Go to step 3.
Replace the radiator fan relay.
3. Connect the HDS to the DLC.
4. Turn the ignition switch to ON (II).
5. Turn on the A/C.
6. Check the FAN LOW CTRL in the PGM-FI Data List with the HDS.
Go to step 7.
Substitute a known-good ECM/PCM (see page
11-7), and retest. If the symptom/indication goes
away with a known-good ECM/PCM, replace the
original ECM/PCM (see page 11-228).
7. Turn the ignition switch to LOCK (0). 8. Measure the voltage between the radiator fan relay
4P socket terminal No. 1 and body ground.
Go to step 9.
Replace the under-hood fuse/relay box
(see page 22-65).
9. Connect the radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
Go to step 10.
Go to step 19.
Ar e t he f uses OK ?
Is the relay OK ?
I s t he F AN LOW CT RL on? 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 14:42:25 61SNR030_210_0057
ProCarManuals.com
DYNOMITE -2009-



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21-58
Climate Control
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
(cont’d)
RADIATOR FAN 2P CONNECTOR
BRN
RADIATOR FAN 2P CONNECTOR RED
JUMPER WIRE FAN CONTROL RELAY 5P SOCKET
RED
23. Measure the voltage between the radiator fan 2Pconnector terminal No. 2 and body ground.
Go to step 24.
Repair open in the wire between the radiator
fan relay and the radiator fan.
24. Set the A/C button and fan control dial OFF, then turn the ignition switch to LOCK (0).
25. Reconnect the radiator fan 2P connector.
26. Connect the radiator fan 2P connector terminal No. 1 to body ground with a jumper wire.
27. Turn the ignition switch to ON (II), then set the A/C button and fan control dial ON.
Go to step 28.
Replace the radiator fan motor. 28. Set the A/C button and fan control dial OFF, then
turn the ignition switch to LOCK (0).
29. Disconnect the jumper wire.
30. Remove the fan control relay from the under-hood fuse/relay box, and test it (see page 22-70).
Go to step 31.
Replace the fan control relay.
31. Turn the ignition switch to ON (II), then set the A/C button and fan control dial ON.
32. Measure the voltage between the fan control relay 5P socket terminal No. 1 and body ground.
Go to step 33.
Repair open in the wire between the radiator
fan and the fan control relay.
33. Set the A/C button and fan control dial OFF, then turn the ignition switch to LOCK (0).
Wire side of female terminals
Wire side of female terminals
Is there battery voltage?
Does t he r ad i at or f an r un? Is the relay OK ?
Is there battery voltage?
08/08/21 14:42:26 61SNR030_210_0059
ProCarManuals.com
DYNOMITE -2009-




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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?
08/08/21 14:43:31 61SNR030_210_0061
ProCarManuals.com
DYNOMITE -2009-

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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
ProCarManuals.com
DYNOMITE -2009-



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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
ProCarManuals.com
DYNOMITE -2009-



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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
ProCarManuals.com
DYNOMITE -2009-



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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
ProCarManuals.com
DYNOMITE -2009-


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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
ProCarManuals.com
DYNOMITE -2009-