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2-474
Cooling System JL4G18-D
86
2
J
1
L
87
30
5
85
3
1
2
K
1
I
5 3
5
2
3
87
ECM Harness Connector EN01
64
63
62
61
60
59
58
57
50
49
48
47
46
45
44
43
36
35
34
33
32
31
30
29
22
21
20
19
18
17
16
15
Yes
Step 7
Check ECM circuit.
Yes
Step 8
Replace ECM.
Next
Diagnostic completed.
Step 9
2.8.7.6 Cooling Fan Always Runs At High Speed
Note
When the cooling fan always runs at high speed, it is recommended to carry out diagnostic when the engine is
completely cooled down.
Verify the fault.
Step 1
Next
Check the engine coolant temperature sensor signal.
Step 2
EC718/EC718RV EC715/EC715RV 10/2009
EF28
EF27
EF08
1
G
5 3
2
30
EF01
3
86
F
85
87
3
86
86
87
E
30
87
86
85
85
B
30
1413 12 11 10
86
87
9
8
6
5
85
7
85
4
3
2
1
56
55
54
53
52
51
8
7
6
5
42
41
40
39
38
37
28
27
26
25
24
23
3
4
1
2
14
13
12
11
10
9
FE02-7811b
(a)
Turn the ignition switch to "OFF" position.
(b)
Disconnect ECM harness connector EN01.
(c)
Remove low-speed cooling fan relay B.
(d)
Test the continuity between cooling fan low speed relay B
terminal No.86 and ECM harness connector EN01 terminal
2
D
5
1
No.62.
2
5
C
1
(e)
Measure resistance between cooling fan low speed relay B
B
30
terminal No.86 and a reliable ground. check whether there is
A
30
a short to ground circuit.
Standard Value:
Relay B (86)-EN01 (62)
Relay B (86) - Reliable Ground
Is the measured value specified Value?
No
(a)
Check whether ECM power supply circuit is normal.
(b)
Check whether ECM ground circuit is normal.
No
Test Items
Circuit between relay B terminal No.86 and
EN01 terminal No.62 is faulty.
Repair the faulty part.
Engine
Specified Value
Less than 1 Ω
10 kΩ or higher
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