9 

Replace cooling fan high-low speed relay 1. 

 

10 

Inspect high-speed or low-speed relay 1 coil power supply. 

(a)  Rotated ignition switch to "OFF" position . 

(b)  Dismantle the low-speed cooling fan relay 1. 

(c)  Rotated ignition switch to "ON" position . 

(d)  Measure voltage between high- or low-speed cooling fan relay 1 terminal No.85 and a 

reliable ground. 

Standard Voltage: 11-14 V 

Confirm whether the voltage conforms to standard value. 

 

11 

Inspect high-speed or low-speed relay control circuit. 

(a)  Rotated ignition switch to "OFF" position . 

(b)  Disconnect ECM harness connector EM01. 

(c)  Dismantle the high- or low-speed cooling fan relay. 

(d)  Test the continuity between the cooling fan high-speed or low-speed relay terminal No.86 

and EM01 terminal No.65. 

(e)  Measure voltage between low speed cooling fan relay    terminal No.86 and a reliable ground. 

Inspect whether the circuit is short to power supply. 

Standard Value 

Test Items 

Specified Value 

High- or Low-speed relay (86)-EM01 (65) 

Less than 1 Ω 

Resistance Between high- or low-speed Relay 
(86) and Reliable Ground 

10 kΩ or higher 

Confirm whether the measured value conforms to the standard value.

 

No 

Open circuit between high- or low-speed relay 1 terminal 
No.85 and fuse EF21,and replace the underhood fuse relay 
box if necessary.

Yes 

No 

Inspect and repair the faulty locations between the 
high-speed or low-speed relay 1 terminal No.87 and the 
cooling fan wiring harness connector CA09 terminal No.1. 

Yes 

551

 

12 

Inspect ECM working circuit. 

(a)  Check if ECM power circuit is normal. 

(b)  Inspect if ECM ground is normal. 

 

13 Replace 

ECM 

 

14 Troubleshooting 

Next 

No 

Repair the faulty part. 

Yes 

No 

Open circuit between high- or low-speed relay terminal 
No.86 and EM01 terminal No.65. 

Yes 

552

2.8.7.6 Cooling Fan 1 Runs At High Speed (Fan 2 Does not Run) 

1 

Confirm Fault Symptom 

 

2 

Use the “Action Test” of fault diagnosis tester to drive the fan low-speed. 

Is the High-Speed relay working? 

 

3 

Inspect the voltage between the sockets #85 and #86 of the high-speed relay. 

 

(a)  Rotated ignition switch to "OFF" 

position . 

(b)  Dismantle high-speed relay. 

(c)  Rotated ignition switch to "ON" 

position . 

(d)  Connect fault diagnosis tester to 

the diagnostic interface. 

(e) Select 

in 

sequence: 

Engine/Action Test/Fan High 
Speed. 

NL11-2262b

ER03

8 5

86

8 7

30

3 0

87

8 6

8 5

ER05

3 0

8 7

86

85

ER06

30

87

87 a

8 6

8 5

ER11

ER08

ER

09

8 5

8 6

87

3 0

4

ER10

2

1

5

3

4

2

1

5

3

4

2

1

5

3

ER04

4

ER02

2

1

5

3

4

2

1

5

3

ER01

ER07

4

2

1

5

3

1

2

3

4

11

12

13

14

15

16

5

6

7

8

9

10

EF0

8

EF0

7

EF2

7

EF2

6

EF2

2

EF2

9

EF

0

3

EF

0

6

EF

0

9

EF2

5

EF1

7

EF1

6

EF1

5

EF

3

5

EF2

1

EF1

4

EF

01

EF

02

EF

04

EF

10

EF

1

1

EF1

8

EF2

4

8 6

8 5

(f)  Measure the voltage between the #85 and #86 sockets of the high-speed relay with 

multimeter. 

(e)  Standard Voltage: 11-14 V 

 

Confirm if the voltage conforms to standard value. 

4 

Repair the underhood Fuse Block Open Circuit fault. 

 

5 

Inspect the voltage on the high-speed relay socket #30. 

Yes 

Replace high-speed relay 

No 

Yes 

Go to step 5 

No 

No 

553

(a)  Rotated ignition switch to "OFF" position . 

(b)  Dismantle high-speed relay. 

(c)  Measure the effective grounding voltage between the socket #30 of the high-speed relay and 

the vehicle body with multimeter. 

(e)  Standard Voltage: 11-14 V 

Confirm if the voltage conforms to standard value. 

 

6 

Check the open circuit fault between the high-speed relay terminal #87 and the fan 
motor 2. 

 

7 Troubleshooting 

Yes 

No 

Check fuse relay box. If necessary, replace 
it. 

Yes 

554