Acura CSX. Manual — part 80

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Symptom

Diagnostic Procedure

Also check for

10-24

Fan Controls

Symptom Troubleshooting Index

Engine overheats

1.
2.

3.

4.
5.
6.

7.
8.
9.

10.

11.
12.

Check the coolant level.
Check for engine coolant leakage (from gaskets,
hoses, O-rings, etc.).
Check for dirt, leaves, or insects on radiator
and A/C condenser.
Check for deteriorated coolant.
Check for a damaged or deformed fan shroud.
Inspect the fan motors (see page 10-5) or fan
relays (see page 22-70).
Check the radiator cap (see page 10-4).
Check the thermostat (see page 10-5).
Inspect the water pump (see page 10-6).
Check for a clogged or deteriorated radiator
hoses.
Check for clogged heater core or hoses.
Check for a damaged cylinder head gasket.

The radiator fan does not run at
high speed

Radiator fan high speed circuit troubleshooting
(see page 10-26).

Cleanliness and
tightness of all
connectors

Both the radiator fan and the A/C
condenser fan do not run at low
speed

Radiator and A/C condenser fans low speed circuit
troubleshooting (see page 21-56).

Cleanliness and
tightness of all
connectors

The A/C condenser fan does not
run at high speed

A/C condenser fan high speed circuit troubleshooting
(see page 21-60).

Cleanliness and
tightness of all
connectors

08/08/21 14:40:31 61SNR030_100_0024

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10-25

Circuit Diagram

ECT2

SG6

SG2

ECT1

FANH

FANL

SUBRLY

IG2 HOT in ON (II)

PNK

5 V

No. 15 (7.5 A)

A21

PUR

ECM/PCM

2

G301

BLK

2

1

No. 11 (15 A)

(10 A)

No. 36

B23

RED/WHT

GRN/BLK

B33

BLU

GRY

BRN

A33

BLK

GRN

A9

IGNITION SWITCH

IG2

BAT

RED

3

2

5

4

1

A4

A5

1

3

4

2

1

2

2

3

4

1

No. 2 (50 A)

BLK

UNDER-HOOD FUSE/RELAY BOX

BATTERY

G301

No. 1 (100 A)

No. 6 (20 A)

A/C
CONDENSER
FAN RELAY

ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 1

A/C
CONDENSER
FAN MOTOR

FAN
CONTROL
RELAY

RADIATOR
FAN
MOTOR

ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 2

RADIATOR
FAN
RELAY

PGM-FI
SUB RELAY

H1

3

4

ORN

G12

D1

F16

F7

F2

F12

F14

F1

F11

No. 7 (20 A)

2

1

1

UNDER-DASH
FUSE/RELAY
BOX

BRN

WHT

4

3

1

2

C3

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＊０２

＊０３

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−

−

−

−

−

−

−

−

YES

NO

YES

NO

YES

NO

YES

NO

10-26

Fan Controls

Radiator Fan High Speed Circuit Troubleshooting

RADIATOR FAN RELAY 4P SOCKET

FAN CONTROL RELAY 5P SOCKET

JUMPER WIRE

RADIATOR FAN RELAY 4P SOCKET

JUMPER WIRE

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.

Reinstall the fuse(s), then go to step 2.

Replace the fuse(s), and recheck. If the fuse

continues to blow, locate and repair the short in the
circuit between the under-hood fuse/relay box and
the radiator fan motor, or between the under-dash
fuse/relay box connector terminal G12, the under-
hood fuse/relay box and the engine control module
(ECM)/powertrain control module (PCM).

2. Remove the radiator fan relay and the fan control

relay from the under-hood fuse/relay box, and test
them (see page 22-70).

Go to step 3.

Replace the radiator fan relay and/or fan

control relay.

3. Measure the voltage between the radiator fan relay

4P socket terminal No. 1 and body ground.

Go to step 4.

Replace the under-hood fuse/relay box.

4. Connect fan control relay 5P socket terminals No. 1

and No. 2 with a jumper wire.

5. Connect radiator fan relay 4P socket terminals

No. 1 and No. 2 with a jumper wire.

Go to step 10.

Go to step 6.

Terminal side of female terminals

Terminal side of female terminals

Terminal side of female terminals

Ar e the f uses OK ?

Ar e the r elays OK ?

Is ther e batter y voltage?

Does the r adiator f an r un at high speed?

08/08/21 14:40:32 61SNR030_100_0026

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−

−

−

−

−

−

YES

NO

YES

NO

YES

NO

10-27

FAN CONTROL RELAY 5P SOCKET

RADIATOR FAN RELAY 4P SOCKET

RADIATOR FAN MOTOR 2P CONNECTOR

BRN

6. Remove the jumper wires, then check for continuity

between fan control relay 5P socket terminal No. 2
and body ground.

Go to step 7.

Repair open in the wire between fan control

relay 5P socket terminal No. 2 and body ground.

7. Test the radiator fan motor (see page 10-5).

Go to step 8.

Replace the radiator fan motor (see page

10-19).

8. Check for continuity between radiator fan relay 4P

socket terminal No. 2 and radiator fan motor 2P
connector terminal No. 2.

Go to step 9.

Repair open in the wire between radiator fan

relay 4P socket terminal No. 2 and radiator fan
motor 2P connector terminal No. 2.

Terminal side of female terminals

Terminal side of female terminals

Wire side of female terminals

Is ther e continuity?

Is the motor OK ?

Is ther e continuity?

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