1
3
5
7
8
6
4
2
9
10
11
12
13
23
24
25
26
27
28
29
30
37
51
52
53
54
55
56
57
58
59
60
61
62
63
64
38
39
40
41
42
43
44
45
46
47
48
49
50
31
32
33
34
35
36
14
15
16
17
18
19
20
21
22
ECM Harness Connector EN01
1413 12 1110
5
1
2
3
4
6
7
8
9
J
L
K
I
G
D
C
B
E
F
A
86
86
30
87
85
86
86
87
87
87
30
30
30
85
85
85
2
2
3
3
5
5
1
1
1
2
5 3
1
2
5 3
86
87
30
1
1
2
5
3
2
5
3
85
EF01
EF21
EF18
EF25
EF20
EF29
EF06
EF02
EF30
EF17
EF19
EF23
EF22
EF26
EF24
EF08
EF27
EF28
EF05
EF07
EF16
EF04
EF03
EF15
EF12
EF10
EF1
1
EF09
EF13
EF14
EF32
EF31
B
86
87
30
85
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
No.62.
(e)
Measure resistance between cooling fan low speed relay B
terminal No.86 and a reliable ground. check whether there is
a short to ground circuit.
Standard Value:
Test Items
Specified Value
Relay B (86)-EN01 (62)
Less than 1 Ω
Relay B (86) - Reliable Ground
10 kΩ or higher
Is the measured value specified Value?
No
Circuit between relay B terminal No.86 and
EN01 terminal No.62 is faulty.
Yes
Step 7
Check ECM circuit.
(a)
Check whether ECM power supply circuit is normal.
(b)
Check whether ECM ground circuit is normal.
No
Repair the faulty part.
Yes
Step 8
Replace ECM.
Next
Step 9
Diagnostic completed.
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.
Step 1
Verify the fault.
Next
Step 2
Check the engine coolant temperature sensor signal.
2-474
Cooling System JL4G18-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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