Suzuki Grand Vitara JB627. Manual — part 72

1A-237 Engine General Information and Diagnosis:

Radiator Cooling Fan Low Speed Control System Check

S6JB0B1104091

Wiring Diagram

Troubleshooting

WARNING

!

Keep hands, tools, and clothing away from engine cooling fan to help prevent personal injury. This fan
is electric and can come on whether or not the engine is running. The fan can start automatically in
response to the ECT sensor with the ignition switch at the “ON” position.

NOTE

• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the

special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.

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E23

C37

BLU/BLK

BLK

RED

YEL/GRN

RED/YEL

BLK

BLU

BLU

BLU/WHT

YEL/GRN

E23-37

E23-15

E23-23

E23-14

YEL/GRN

BLU/RED

BLU/YEL

RED/BLK

5V

C37-26
C37-67

PPL/YEL

GRY/GRN

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6

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9

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10

2

1

I6JB01110015-02

1. Fuse box No.1

5. Radiator cooling fan relay No.3

9. ECT sensor

2. Ignition switch

6. Radiator cooling fan motor No.1

10. “IG2 SIG” fuse

3. Radiator cooling fan relay No.1

7. Radiator cooling fan motor No.2

4. Radiator cooling fan relay No.2

8. ECM

Step

Action

Yes

No

1

Is there DTC(s) of ECT sensor circuit (DTC P0116 / P0117 /
P0118) and/or radiator cooling fan circuit (DTC P0480 /
P0481 / P0482)?

Go to corresponding
DTC flow.

Go to Step 2.

2

Low speed radiator cooling fan control circuit check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Start engine and select “DATA LIST” mode on scan tool.
3) Warm up engine until coolant temp. is 92

°C (197.6 °F)

or higher and A/C switch turns OFF (if equipped with A/
C). (If engine coolant temp. dose not rise, check engine
cooling system or ECT sensor.)

Is radiator cooling fan started at low speed when engine
coolant temp. reached above temp.?

Radiator cooling fan low
speed control system is
in good condition.

Perform from Step 2 to
Step of “DTC P0480 /
P0481 / P0482: Fan 1 /
Fan 2 / Fan 3 Control
Circuit”.

Engine General Information and Diagnosis: 1A-238

3

Wire circuit check
1) Disconnect radiator cooling fan relay No.1 from relay

box with ignition switch turned OFF.

2) Turn ON ignition switch.
3) Measure voltage between “BLU/WHT” wire terminal of

radiator cooling fan relay No.1 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 4.

“BLU/WHT” wire is open
circuit.

4

Radiator cooling fan control check
1) Disconnect connector from radiator cooling fan motor

No.1 and connect radiator cooling fan relay No.1 with
ignition switch turned OFF.

2) Run engine until ECT is over 92

°C (197.6 °F).

3) Measure voltage between “BLU/RED” wire terminals of

radiator cooling fan motor No.1 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 5.

Go to Step 6.

5

Wire circuit check
1) Disconnect radiator cooling fan relay No.1 from relay

box with ignition switch turned OFF.

2) Measure resistance between “BLU/RED” wire terminals

of radiator cooling fan relay No.1 connector and radiator
cooling fan motor No.1 connector.

Is resistance below 3

Ω

?

Go to Step 15.

“BLU/RED” wire is open
or high resistance.

6

Wire circuit check
1) Disconnect radiator cooling fan relay No.2 and connect

radiator cooling fan motor No.1 connector with ignition
switch turned OFF.

2) Run engine until ECT is over 92

°C (197.6 °F).

3) Measure voltage between “BLU/YEL” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 10.

Go to Step 7.

7

Wire circuit check
1) Disconnect radiator cooling fan motor No.1 connector

with ignition switch turned OFF.

2) Measure resistance between “BLU/YEL” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground.

Is resistance infinity?

Go to Step 8.

“BLU/YEL” wire is
shorted to ground
circuit.

8

Wire circuit check
1) Measure voltage between “BLU/YEL” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 9.

“BLU/YEL” wire is
shorted to other circuit.

Step

Action

Yes

No

1A-239 Engine General Information and Diagnosis:

9

Wire circuit check
1) Measure resistance between “BLU/YEL” wire terminal of

radiator cooling fan relay No.2 connector and radiator
cooling fan motor No.1 connector with ignition switch
turned OFF.

Is resistance below 5

Ω

?

Go to Step 16.

“BLU/YEL” wire is open
circuit.

10 Radiator cooling fan control check

1) Disconnect connector from radiator cooling fan motor

No.2 and connect radiator cooling fan relay No.2 with
ignition switch turned OFF.

2) Run engine until ECT is over 92

°C (197.6 °F).

3) Measure voltage between “BLU” wire terminals of

radiator cooling fan motor No.2 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 14.

Go to Step 11.

11 Wire circuit check

1) Disconnect radiator cooling fan relay No.2 with ignition

switch turned OFF.

2) Measure resistance between “BLU” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground.

Is resistance infinity?

Go to Step 12.

“BLU” wire is shorted to
ground circuit.

12 Wire circuit check

1) Measure voltage between “BLU” wire terminal of radiator

cooling fan relay No.2 connector and vehicle body
ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 13.

“BLU” wire is shorted to
other circuit.

13 Wire circuit check

1) Measure resistance between “BLU” wire terminals of

radiator cooling fan relay No.2 connector and radiator
cooling fan motor No.2 connector with ignition switch
turned OFF.

Is resistance below 3

Ω

?

Go to Step 15.

“BLU” wire is open
circuit.

14 Wire circuit check

1) Measure resistance between “BLK” wire terminal of

radiator cooling fan motor No.2 connector and vehicle
body ground with ignition switch turned OFF.

Is resistance below 3

Ω

?

Go to Step 16.

“BLK” wire is open
circuit.

15 Radiator cooling fan motor check

1) Check radiator cooling fan motor referring to “Radiator

Cooling Fan Motor On-Vehicle Inspection in Section 1F”.

Is it in good condition?

Substitute a known
good ECM and recheck.

Replace radiator cooling
fan motor.

16 Radiator cooling fan motor check

1) Check radiator cooling fan motor referring to “Radiator

Cooling Fan Motor On-Vehicle Inspection in Section 1F”.

Is it in good condition?

Substitute a known
good ECM and recheck.

Replace radiator cooling
fan motor.

Step

Action

Yes

No

Engine General Information and Diagnosis: 1A-240

Radiator Cooling Fan High Speed Control System Check

S6JB0B1104092

Wiring Diagram
Refer to “Radiator Cooling Fan Low Speed Control System Check”.

Troubleshooting

WARNING

!

Keep hands, tools, and clothing away from engine cooling fan to help prevent personal injury. This fan
is electric and can come on whether or not the engine is running. The fan can start automatically in
response to the ECT sensor with the ignition switch at the “ON” position.

NOTE

• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the

special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”.

Step

Action

Yes

No

1

Is there DTC(s) of ECT sensor circuit (DTC P0116 / P0117 /
P0118) and/or radiator cooling fan circuit (DTC P0480 /
P0481 / P0482)?

Go to corresponding
DTC flow.

Go to Step 2.

2

Low speed radiator cooling fan control circuit check
1) Connect scan tool to DLC with ignition switch turned

OFF.

2) Start engine and select “DATA LIST” mode on scan tool.
3) Warm up engine until coolant temp. is 92

°C (197.6 °F)

or higher and A/C switch turns OFF (if equipped with A/
C). (If engine coolant temp. dose not rise, check engine
cooling system or ECT sensor.)

Is radiator cooling fan started at low speed when engine
coolant temp. reached above temp.?

Go to Step 3.

Perform from Step 2 to
Step 5 in “Radiator
Cooling Fan Low Speed
Control System Check”.

3

High speed radiator cooling fan control circuit check
1) Start engine and select “DATA LIST” mode on scan tool.
2) Warm up engine until coolant temp. is 102

°C (215.6 °F)

or higher and A/C switch turns OFF (if equipped with A/
C). (If engine coolant temp. dose not rise, check engine
cooling system or ECT sensor.)

Is radiator cooling fan started at high speed when engine
coolant temp. reached above temp?

Radiator cooling fan
control system is in
good condition.

Perform from Step 2 to
Step 5 in DTC P0480
P0481/ P0482: Fan 1 /
Fan 2 / Fan 3 Control
Circuit.
If OK, Go to Step 4.

4

Wire circuit check
1) Disconnect radiator cooling fan relay No.3 from relay

box with ignition switch turned OFF.

2) Turn ON ignition switch.
3) Measure voltage between “BLU/BLK” wire terminal of

radiator cooling fan relay No.3 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 5.

“BLU/BLK” wire is open
circuit.