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Acura RSX Honda Integra. Manual - part 407

−

YES

’02-04 models

’05-06 models

YES

21-35

Radiator and A/C Condenser Fan Common Circuit Troubleshooting

BLK/YEL

A/C CONDENSER FAN RELAY 4P SOCKET

ECM/PCM CONNECTOR B (24P)

GRN

ECM/PCM CONNECTOR E (31P)

GRN/WHT

NOTE:

• Do not use this troubleshooting procedure if only one

fan is inoperative, or 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. 1 (30 A) and No. 4 (20 A) fuses in the

under-hood fuse/relay box, and the No. 14 (10 A)
fuse in the under-dash fuse/relay box.

Go to step 2.

Replace the fuse(s), and recheck.

2. Remove the A/C condenser fan relay from the

under-hood fuse/relay box.

3. Turn the ignition switch ON (II).

4. Measure the voltage between the No. 3 terminal of

the A/C condenser fan relay 4P socket and body
ground.

Go to step 5.

Repair open in the BLK/YEL wire between the

No. 14 (10 A) fuse in the under-dash fuse/relay box
and the radiator fan relay, and the A/C condenser
fan relay.

5. Turn the ignition switch OFF.

6. Reinstall the A/C condenser fan relay.

7. Make sure the A/C switch is OFF.

8. Turn the ignition switch ON (II).

9. ’02-04 models: Using a backprobe set, measure the

voltage between the No. 6 terminal of ECM/PCM
connector B (24P) and body ground with the
ECM/PCM connectors connected.
’05-06 models: Using a backprobe set, measure the
voltage between the No. 12 terminal of ECM/PCM
connector E (31P) and body ground with the
ECM/PCM connectors connected.

Update the ECM/PCM if it does not have the

latest software, or substitute a known-good ECM/
PCM, then recheck (see page 11-6). If the symptom/
indication goes away with a known-good ECM/PCM,
replace the original ECM/PCM.

Repair open in the wire between the radiator

fan relay, the A/C condenser fan relay and the
ECM/PCM.

Wire side of female terminals

Ar e the f uses OK ?

Is ther e batter y voltage?

05/06/27 18:04:51 61S6M040_210_0036

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YES

21-36

Climate Control

A/C Compressor Clutch Circuit Troubleshooting

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

BLU/RED

JUMPER WIRE

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

NOTE:

• Do not use this troubleshooting procedure if the fans

are also inoperative. Refer to the symptom
troubleshooting index.

• Before performing symptom troubleshooting, check

for powertrain DTCs (see page 11-3).

1. Check the No. 1 (30 A) fuse in the under-hood

fuse/relay box, and the No. 14 (10 A) fuse in the
under-dash fuse/relay box.

Go to step 2.

Replace the fuse(s), and recheck.

2. Check the engine coolant temperature, the throttle

position sensor, and the idle speed (use the HDS
PGM-FI data list if possible).

ECT Sensor

169

194 °F (76

90 °C)

TP Sensor

About 0.5 V

RPM

K20A02, K20Z1 engine: 700
K20A03 engine: 650

Go to step 3.

Troubleshoot and repair the cause of the high

engine coolant temperature, low idle, or
excessively high throttle position sensor reading.

3. Remove the A/C compressor clutch relay from the

under-hood fuse/relay box, and test it (see page
22-62).

Go to step 4.

Replace the A/C compressor clutch relay.

4. Measure the voltage between the No. 2 terminal of

the A/C compressor clutch relay 4P socket and
body ground.

Go to step 5.

Replace the under-hood fuse/relay box.

5. Connect the No. 1 and No. 2 terminals of the A/C

compressor clutch relay 4P socket with a jumper
wire.

Go to step 6.

Go to step 14.

Ar e the f uses OK ?

Ar e the engine coolant temper atur e, thr ottle
position and idle speed OK ?

Is the r elay OK ?

Is ther e batter y voltage?

Does the A/ C compr essor clutch click?

05/06/27 18:04:52 61S6M040_210_0037

−

YES

’02-04 models

’05-06 models

YES

21-37

BLK/YEL

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

ECM/PCM CONNECTOR E (31P)

RED

ECM/PCM CONNECTOR E (31P)

RED

6. Disconnect the jumper wire.

7. Turn the ignition switch ON (II).

8. Measure the voltage between the No. 3 terminal of

the A/C compressor clutch relay 4P socket and
body ground.

Go to step 9.

Repair open in the BLK/YEL wire between the

No. 14 (10 A) fuse in the under-dash fuse/relay box
and the A/C compressor clutch relay.

9. Turn the ignition switch OFF.

10. Reinstall the A/C compressor clutch relay.

11. Make sure the A/C switch is OFF.

12. Turn the ignition switch ON (II).

13. Using a backprobe set, measure the voltage

between the No. 18 terminal of ECM/PCM
connector E (31P) and body ground with the
ECM/PCM connectors connected.

Update the ECM/PCM if it does not have the

latest software, or substitute a known-good ECM/
PCM, then recheck (see page 11-6). If the symptom/
indication goes away with a known-good ECM/PCM,
replace the original ECM/PCM.

Repair open in the wire between the A/C

compressor clutch relay and the ECM/PCM.

14. Disconnect the jumper wire.

15. Disconnect the A/C compressor clutch 1P connector.

(cont’d)

Wire side of female terminals

Is ther e batter y voltage?

05/06/27 18:04:53 61S6M040_210_0038

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YES

21-38

Climate Control

A/C Compressor Clutch Circuit
Troubleshooting (cont’d)

A/C Pressure Switch Circuit
Troubleshooting

BLU/RED

A/C COMPRESSOR CLUTCH 1P CONNECTOR

BLU/RED

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

A/C PRESSURE SWITCH 2P CONNECTOR

BLU/WHT

16. Check for continuity between the No. 1 terminal of

the A/C compressor clutch relay 4P socket and the
No. 1 terminal of the A/C compressor clutch 1P
connector.

Check the A/C compressor clutch clearance,

the thermal protector, and the A/C compressor
clutch field coil (see page 21-57).

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 the

following items are operative: A/C condenser fan,
radiator fan, A/C compressor, or if the heater is
inoperative. Refer to the symptom troubleshooting
index.

• Before performing symptom troubleshooting, check

for powertrain DTCs (see page 11-3).

1. Disconnect the A/C pressure switch 2P connector.

2. Turn the ignition switch ON (II).

3. Measure the voltage between the No. 2 terminal of

the A/C pressure switch 2P connector and body
ground.

Go to step 4.

Go to step 12.

4. Turn the ignition switch OFF.

Terminal side of male terminals

Wire side of female terminals

Is ther e continuity?

Is ther e batter y voltage?

05/06/27 18:04:55 61S6M040_210_0039

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