SsangYong Musso. Manual - part 120

1F-64  ENGINE CONTROLS

SSANGYONG  Y158

Circuit Description

The cooling fan circuit operates the cooling fan motor
(RH) and the cooling fan motor (LH).

The cooling fan motor (RH) is controlled by the Engine
Control Module (ECM) based on inputs from the Engine
Coolant Temperature (ECT) sensor and the Air Condi-
tioning  Pressure (ACP) sensor or A/C switch signal.
The ECM controls the cooling fan motor (RH) operation
by internally grounding the ECM connector terminal 35
when the engine coolant temperature is high. This ener-
gizes the cooling fan relay (RH high) and operates the
cooling fan motor (RH) at high speed as the cooling fan
motor (RH) is connected directly to the battery.

Whereas Full Automatic Temperature Control (FATC) or

ENGINE COOLING FAN CIRCUIT CHECK - WITH A/C

Manual A/C control panel controls the cooling fan motor
(LH) and the cooling fan motor (RH). When the A/C
switch is ON, FATC or Manual A/C control panel pro-
vides the ground to cooling fan relay (LH high) and the
cooling fan relay (RH low). These make the cooling fan
motor (LH) operate high speed and the cooling fan mo-
tor (RH) operate low.

Diagnostic Aids

•••••

If the owner complained of an overheating problem, it
must be determined if the complaint was due to an
actual boil over, or the engine coolant temperature
gauge indicated overheating. If the engine is
overheating and the cooling fan motor (RH) is not
operated, the cooling system should be checked.

YAA1F64A

ENGINE CONTROLS  1F-65

SSANGYONG  Y158

1

Perform an Euro On-Board Diagnostic (EOBD) System
Check.
Is the check performed?

1. Check the I/P fuse block fuse F24 and F19.
2. Replace the fuses as needed.
Are the fuses OK?
1. Check the engine fuse block fuse Ef5.
2. Replace the fuse as needed.
Is the fuse OK?
1. Turn the ignition OFF.
2. Turn the A/C switch OFF.
3. Connect a scan tool to the Data Link Connector

(DLC).

4. Start the engine.
5. The cooling fan motor (RH) should run at high speed

when the coolant temperature reaches 105 °C
 (221 °F).

Does the cooling fan motor (RH) run at high speed?
1. Turn the ignition OFF.
2. Disconnect the cooling fan motor (RH) connector.
3. Turn the ignition ON.
4. The Coolant Temperature value should be above

105 °C (221 °F).

5. With a test light connected to ground, probe the

cooling fan motor (RH) connector terminal 1.

Is the test light ON?

Step

Action

Value(s)

Yes

No

Engine Cooling Fan Circuit Check -  with A/C

-

 Go to Step 2

Go to “Euro On-

Board Diagnos-

tic System

Check”

-

 Go to Step 3

Go to

“Diagnostic

Aids”

2

3

-

 Go to Step 19

 Go to Step 5

4

•••••

If the I/P fuse block fuse F25 becomes open (blown)
immediately after installation, inspect for a short to
ground in the wiring of the cooling fan relay (RH high)
circuit. If the engine fuse block fuse Ef14 becomes
open (blown) when the cooling fan relay (RH high) is
to be turned ON by the Engine Control Module
(ECM), suspect a faulty cooling fan motor circuit.

•••••

The ECM will turn the cooling fan motor (RH) ON at
high speed when the coolant temperature reaches
105 ° C  (221 °F).

•••••

The cooling fan motor (RH) circuit can be checked
quickly by disconnecting the ECM connector and
grounding the connector terminal 35. This should
create high speed cooling fan motor (RH) operation
with the ignition ON.

Test Description

The number(s) below refer to specific step(s) on the
diagnostic table.

-

 Go to Step 6

 Go to Step 7

5

4. This step checks for the ability of the Engine Control

Module (ECM) to operate the cooling fan motor (RH).

5. This step checks for the presence of battery voltage

to the cooling fan motor (RH) when the ECM com-
mands the operation of motor. If battery voltage is
present and the motor is not operating, the problem
is in the ground side of the cooling fan motor (RH)
circuit or motor.

19. This step checks for the ability of the FATC control-

ler (or Manual A/C controller) to operate the cooling
fans in response to A/C switch ON.

21.  This step checks for the presence of battery voltage

to the cooling fan motor (LH) when the A/C is ON. If
battery voltage is present and the motor is not oper-
ating, the problem is in the ground side of the cool-
ing fan motor (LH) circuit or motor.

-

 Go to Step 3

Go to

“Diagnostic

Aids”

1F-66  ENGINE CONTROLS

SSANGYONG  Y158

6

With a test light connected to battery, probe the cooling
fan motor (RH) connector terminal 2.
Is the test light ON?
1. Turn the ignition OFF.
2. Disconnect the cooling fan relay (RH high)

connector.

3. Turn the ignition ON.
4. The Coolant Temperature value should be above

105 °C (221 °F).

5. With a test light connected to battery, probe the

cooling fan relay (RH high) connector terminal 85.

Is the test light ON?
With a test light connected to ground, probe the cooling
fan relay (RH high) connector terminal 86.
Is the test light ON?
With a test light connected to ground, probe the cooling
fan relay (RH high) connector terminal 30.
Is the test light ON?
Check for an open wire between the cooling fan relay
(RH high) connector terminal 87 and the cooling fan
motor (RH) connector terminal 1.
Is the problem found?
1. Turn the ignition OFF.
2. Disconnect the Engine Control Module (ECM)

connector.

3. Check for an open wire between the cooling fan relay

(RH high) connector terminal 85 and ECM connector
terminal 35.

Is the problem found?
Check for an open wire between the cooling fan relay
(RH high) connector terminal 86 and I/P fuse block fuse
F24 and repair as necessary.
Is the repair complete?
Check for an open wire between the cooling fan relay
(RH high) connector terminal 30 and engine fuse block
fuse Ef5 and repair as necessary.
Is the repair complete?
Repair the open wire as needed.
Is the repair complete?
Check for a poor connection at the terminals and repair
the malfunctioning terminals as necessary.
Is a repair complete?
1. Turn the ignition OFF.
2. Replace the cooling fan relay (RH high).
Is the action complete?
Replace the cooling fan motor (RH).
Is the action complete?
Replace the ECM.
Is the action complete?

Step

Action

Value(s)

Yes

No

Engine Cooling Fan Circuit Check -  with A/C (Cont'd)

-

 Go to Step 17

 Go to Step 14

-

 Go to Step 8

 Go to Step 11

7

8

-

 Go to Step 9

 Go to Step 12

-

 Go to Step 14

 Go to Step 16

10

-

 Go to Step 14

 Go to Step 15

11

-

 Go to Step 10

 Go to Step 13

9

-

System OK

-

12

-

System OK

-

13

-

System OK

-

14

-

System  OK

 Go to Step 18

15

-

System OK

-

16

-

System OK

-

17

-

System OK

-

18

ENGINE CONTROLS  1F-67

SSANGYONG  Y158

19

1. Turn the ignition OFF.
2. Turn the ignition ON.
3. Start the engine.
4. Turn the A/C switch ON.
5. Confirm that the Coolant Temperature value on the

scan tool is less than 105 °C (221 °F).

6. The cooling fan motor (RH) should run at low speed

and the cooling fan motor (LH) should run at high
speed.

Do the cooling fan motors run at the specified speed?
Does the cooling fan motor (RH) run at low speed?
1. Turn the ignition OFF.
2. Disconnect the cooling fan motor (LH) connector.
3. Start the engine.
4. Turn the A/C switch ON.
5. With a test light connected to ground, probe the

cooling fan motor (LH) connector terminal 2.

Is the test light ON?
With a test light connected to battery, probe the cooling
fan motor (LH) connector terminal 1.
Is the test light ON?
1. Turn the ignition OFF.
2. Disconnect the cooling fan relay (LH high) connector.
3. Start the engine.
4. Turn the A/C switch ON.
5.  With a test light connected to battery, probe the

cooling fan relay (LH high) connector terminal 85.

Is the test light ON?
With a test light connected to ground, probe the cooling
fan relay (LH high) connector terminal 86.
Is the test light ON?
With a test light connected to ground, probe the cooling
fan relay (LH high) connector terminal 30.
Is the test light ON?
Check for an open wire between the cooling fan relay
(LH high) connector terminal 87 and the cooling fan
motor (LH) connector terminal 2.
Is the problem found?
Check for an open wire between the cooling fan relay
(LH high) connector terminal 85 and FATC controller
terminal A16 (or Manual A/C controller terminal 1) and
repair as necessary.
Is the repair complete?
Check for an open wire between the cooling fan relay
(LH high) connector terminal 86 and I/P fuse block fuse
F19 and repair as necessary.
Is the repair complete?

Step

Action

Value(s)

Yes

No

Engine Cooling Fan Circuit Check -  with A/C (Cont’d)

-

System  OK

 Go to Step 20

-

 Go to Step 21

 Go to Step 32

20

21

-

 Go to Step 22

 Go to Step 23

-

 Go to Step 24

 Go to Step 27

23

24

-

 Go to Step 31

 Go to Step 14

22

-

 Go to Step 25

 Go to Step 28

25

-

 Go to Step 26

 Go to Step 29

26

-

 Go to Step 14

 Go to Step 30

27

28

-

System OK

-

-

System OK

Go to “7B or

7D HVAC

section”