Mitsubishi Lancer Evolution IX. Manual — part 656
TROUBLESHOOTING
ENGINE COOLING
14-9
STEP 11. Check the harness wire between
engine-ECU connector C-121 and fan controller
connector A-17.
NOTE:
AC210877AC
Connector: A-13 <LHD>
A-13 (B)
AC310903AB
Connector: C-31 <RHD>
C-31
If intermediate connector A-13 <LHD> terminal 2 and
intermediate connector C-31 <RHD> terminal 14 is
damaged, repair or replace it. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
.
AC505254 AC
Connector: C-121 <LHD>
C-121 (GR)
Engine-ECU
15
29
2221
23
3534
7
8
16
18
19
17
20
31
32
33
30
5
6
11 10
12
13
14
26
2827
25
3
4
2
9
24
1
JAE
Component side
AC505255 AC
Connector: C-121 <RHD>
C-121 (GR)
Engine-ECU
15
29
2221
23
3534
7
8
16
18
19
17
20
31
32
33
30
5
6
11 10
12
13
14
26
2827
25
3
4
2
9
24
1
JAE
Component side
AC210859
Connector: A-17
A-17 (GR)
AD
Fan controller
Component side
Q: Are the harness wires between engine-ECU
connector C-121 terminal 18 and fan controller
connector A-17 terminal 2 damaged?
YES :
Repair or replace them, then go to Step 13.
NO :
Go to Step 12.
TROUBLESHOOTING
ENGINE COOLING
14-10
STEP 12. Check the fan controller at engine-ECU
connector C-121.
AC505254
16
25
10
24
1
9
2
4
27
13
26
11
3
12
2829
1415
3031
1718
33
32
6
20
5
19
21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <LHD>
Harness side
C-121 (GR)
Engine-ECU
AC505255
16
25
10
24
1
9
2
4
27
13
26
11
3
12
2829
1415
3031
1718
33
32
6
20
5
19
21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <RHD>
Harness side
C-121 (GR)
Engine-ECU
(1) Do not disconnect engine-ECU connector C-121.
(2) Pull out terminal No.18.
(3) Turn the ignition switch to the "ON" position.
Q: Does the cooling fan motor operate?
YES :
Replace the engine-ECU. Then go to Step
13.
NO :
Replace the fan controller. Then go to Step
13.
STEP 13. Check the symptoms.
Q: Does the cooling fan operate correctly?
YES :
The procedure is complete.
NO :
Return to Step 1.
INSPECTION PROCEDURE 2: Cooling fan does not change speed or does not stop
NOTE: If the engine coolant temperature reaches 110
°
C or higher, the cooling fan control runs the cooling fan
for up to 5 minutes even after the ignition switch is turned to the "LOCK" (OFF) position (the fan stops its rota-
tion when the engine coolant temperature decreases to 110
°
C or lower).
COOLING FAN DRIVE CIRCUIT
Refer to
.
CIRCUIT OPERATION
• The fan controller is powered from fusible link
No.2.
• The engine-ECU judges the required revolution
speed of cooling fan motor using the input signals
transmitted from A/C switch, vehicle speed sen-
sor and engine coolant temperature sensor. The
engine-ECU activates the fan controller to drive
the cooling fan motor.
TROUBLESHOOTING
ENGINE COOLING
14-11
TECHNICAL DESCRIPTION
• The fan controller has variable control of the cool-
ing fan motor speed using signals transmitted
from the engine-ECU.
TROUBLESHOOTING HINTS
• Malfunction of fan control relay
• Malfunction of fan controller
• Malfunction of engine-ECU
DIAGNOSIS
STEP 1. Check the fan control relay.
Refer to
.
Q: Is the fan control relay in good condition?
YES :
Go to Step 2.
NO :
Replace the part, then go to Step 8.
STEP 2. Check the harness wire between fan
control relay connector A-09X terminal 2 and fan
controller connector A-17 terminal 3.
AC310900AB
Connector: A-09X
A-09X
3
1
4
2
Relay box
side
AC210859
Connector: A-17
A-17 (GR)
AD
Fan controller
Component side
Q: Are the harness wire between fan control relay
connector A-09X and fan controller connector A-17
damaged?
YES :
Repair or replace the part, then go to Step
6.
NO :
Go to Step 3.
STEP 3. Measure the output circuit voltage at
engine-ECU connector C-121 terminal 18 by
backprobing.
AC505254
16
25
10
24
1
9
2
4
27
13
26
11
3
12
2829
1415
3031
1718
33
32
6
20
5
19
21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <LHD>
Harness side
C-121 (GR)
Engine-ECU
AC505255
16
25
10
24
1
9
2
4
27
13
26
11
3
12
2829
1415
3031
1718
33
32
6
20
5
19
21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <RHD>
Harness side
C-121 (GR)
Engine-ECU
(1) Do not disconnect engine-ECU connector C-121.
(2) Start the engine and allow it to idle.
(3) Measure the voltage between terminal No.18 and
earth by backprobing.
• The voltage should measure less than 0.3 volt
when the cooling fan is not operating.
Q: Is the voltage less than 0.3 volt when the cooling
fan is not operating?
YES :
Go to Step 6.
NO :
Go to Step 4.
TROUBLESHOOTING
ENGINE COOLING
14-12
STEP 4. Measure the output circuit voltage at
engine-ECU connector C-121 terminal 18 by
backprobing.
AC505254
16
25
10
24
1
9
2
4
27
13
26
11
3
12
2829
1415
3031
1718
33
32
6
20
5
19
21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <LHD>
Harness side
C-121 (GR)
Engine-ECU
AC505255
16
25
10
24
1
9
2
4
27
13
26
11
3
12
2829
1415
3031
1718
33
32
6
20
5
19
21
35
34
8
23
7
22
JAE
AB
Connector: C-121 <RHD>
Harness side
C-121 (GR)
Engine-ECU
(1) Do not disconnect engine-ECU connector C-121.
(2) Start the engine and allow it to idle.
(3) Turn the A/C switch to the "ON" position.
(4) Measure the voltage between terminal No.18 and
earth by backprobing.
• The voltage should measure 0.7 volt or more
when the cooling fan is operating.
Q: Is the voltage 0.7 volt or more when the cooling fan
is operating?
YES :
Go to Step 6.
NO :
Go to Step 5.
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