sensor ACURA CSX 2006 Service Repair Manual



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DTC B1232 or DTC indicator H:
YES
NO
YES
NO YES
NO
YES
NO
21-39
BRN
CLIMATE CONTROL UNIT 32P CONNECTOR
RED BRN
CLIMATE CONTROL UNIT 32P CONNECTOR
A Short in the
Evaporator Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Remove the evaporator temperature sensor (see page 21-78), and test it (see page 21-70).
Go to step 7.
Replace the evaporator temperature
sensor.
7. Disconnect the climate control unit 32P connector. 8. Check for continuity between body ground and the
climate control unit 32P connector terminal No. 8.
Repair short to body ground in the wires
between the climate control unit and the
evaporator temperature sensor.
Go to step 9.
9. Check for continuity between the climate control unit 32P connector terminals No. 8 and No. 19.
Repair short in the wires between the climate
control unit and the evaporator temperature
sensor.
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
Wire side of female terminals
Wire side of female terminals
I s DT C B1232 or H i nd i cat ed ?
Is t he ev apor at or t emper at ur e sensor OK ? Is there continuity?
Is there continuity?
08/08/21 14:42:19 61SNR030_210_0040
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YES
NO
YES
NO YES
NO
YES
NO
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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NO
YES
NO
YES
NO
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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YES
NO
YES
NO
YES
NO
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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21-6721-67
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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21-78 Climate Control
Evaporator Core 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
D
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft) A
1. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-90).
2. Disconnect the clamp (A), then remove the bolt.
3. Remove the nut, then disconnect the A/C lines (A) from the evaporator core. 4. Remove the stud bolt.
5. Remove the blower unit (see page 21-76).
6. Disconnect the connectors (A) from the evaporator
temperature sensor and the power transistor, then
remove the connector clip (B). Remove the
self-tapping screws, the expansion valve cover (C),
and the seal (D).
08/08/21 14:43:41 61SNR030_210_0079
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21-79
BA
94 mm
(3.70 in.) 229.5 mm
(9.04 in.)
A
B
7. Carefully pull out the evaporator core (A) withoutbending the lines, then remove the plate (B).
8. Remove the clips (A) and the evaporator temperature sensor (B). 9. Install the core in the reverse order of removal, and
note these items:
 If you’re installing a new evaporator core, 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.
 Make sure that there is no air leakage.
 Charge the system (see page 21-92).
08/08/21 14:43:42 61SNR030_210_0080
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