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Acura CSX. Manual - part 486

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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

100 °C (176

212 °F)

TP Sensor

About 0.5 V at idle

RPM

More than 670

A/C Switch

A/C Clutch

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 the f uses OK ?

Ar e all the values within specif ications?

Is the r elay OK ?

Is ther e batter y voltage?

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21-63

JUMPER WIRE

PUR

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.

Terminal side of female terminals

Does the A/ C compr essor clutch click?

Is ther e batter y voltage?

Does the A/ C compr essor click?

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21-64

Climate Control

A/C Signal Circuit Troubleshooting

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

RED/WHT

A/C COMPRESSOR CLUTCH 3P CONNECTOR

PUR

RED

BRN

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

Is ther e continuity?

Is the A/ C SW IT CH on?

Is r esistance less than 24 k

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21-64

Climate Control

A/C Signal Circuit Troubleshooting

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

RED/WHT

A/C COMPRESSOR CLUTCH 3P CONNECTOR

PUR

RED

BRN

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

Is ther e continuity?

Is the A/ C SW IT CH on?

Is r esistance less than 24 k

08/08/21 14:43:33 61SNR030_210_0065

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