Mitsubishi Lancer Evolution IX. Manual — part 462
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-323
STEP 23. Check harness between B-120 (terminal
No. 2 and No. 4) fuel pump relay (3) connector
and B-121 (terminal No. 1) fuel pump resistor
connector.
NOTE: Before checking harness, check intermediate
connector C-123, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Replace the engine-ECU.
NO :
Repair the damaged harness wire.
AK305262
2 1
3
4
Harness side connector
Connector: B-120
B-120
B-120
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block’s
triangle marks
AK305259
1
2
Harness side connector
Connector: B-121
B-121(B)
B-121(B)
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-324
Inspection Procedure 25: Radiator Fan Control Relay System
1
2
3
4
1
3
2
4
AK501830
1 2 3
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24 25
26 27 28 29
3132 33
34 35
1
10
20A
Battery
W
W
Radiator fan control relay circuit
6 <A-13> (*1) or
13 <C-31> (*2)
Engine control relay
Relay relay
To engine-ECU
Engine-ECU
J/C (6)
C-105
B-Y
B-Y
R-Y
B-12X
28
1
2
3
4
Radiator
fan control relay
R-Y
R-Y
1
3
B
33
A-13 (*1)
3
A-13
2 (*1) or 1 (*2)
B-W
L-B
A-09X
Fusible link (2)
4
3
2
31
L
2
Fan control
circuit
Fan
controller
A-17
(MU802322)
C-121
(MU803784)
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
AB
Engine control system
B-Y
8
C-31 (*2)
12
L
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-325
OPERATION
• The battery voltage is applied to the fan control
relay (terminal No. 1) form the engine control
relay (terminal No. 4) and is earthed to the vehi-
cle body from the radiator fan control relay (termi-
nal No. 3).
• The battery voltage is applied to the radiator fan
control relay (terminal No. 4).
• When the radiator fan control relay is in "ON"
position, the battery voltage is supplied to the fan
controller (terminal No.3) from the radiator fan
control relay (terminal No. 2).
FUNCTION
• When the engine control relay turns "ON", the
radiator fan control relay turns "ON" simultane-
ously, and power is supplied to the fan controller.
The radiator fan motor is driven when the fan
motor drive signal is input to the fan controller
from the engine-ECU.
PROBABLE CAUSES
• Failed radiator fan control relay
• Failed fan controller
• Failed radiator fan motor
• Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE:
.
*1: L.H. drive vehicles
*2: R.H. drive vehicles
STEP 1. Connector check: A-09X radiator fan
control relay connector.
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Check radiator fan control relay.
• Check radiator fan control relay (Refer to
GROUP 14
− On-vehicle Service
).
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the fan control relay.
STEP 3. Perform resistance measurement at
A-09X radiator fan control relay connector.
• Remove relay, and measure at relay box side.
• Resistance between terminal No.3 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check and repair harness between A-09X
(terminal No. 3) radiator fan control relay
connector and body earth.
• Check and earthing line for open
circuit and damage.
STEP 4. Perform voltage measurement at A-09X
radiator fan control relay connector.
• Remove relay, and measure at relay box side.
• Ignition switch: "ON"
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 5 .
AK305263
3
1
2
4
AB
A-09X
Harness side
connector
Connector: A-09X
AK305263
3
1
2
4
AB
A-09X
Harness side
connector
Connector: A-09X
AK305263
3
1
2
4
AB
A-09X
Harness side
connector
Connector: A-09X
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-326
STEP 5. Connector check: B-12X engine control
relay connector.
Q: Is the check result normal?
YES :
Check intermediate connectors A-13*
1
or
C-31*
2
and C-105, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between B-12X (terminal
No. 4) engine control relay connector and
A-09X (terminal No. 1) radiator fan control
relay connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace the connector.
STEP 6. Perform voltage measurement at A-09X
radiator fan control relay connector.
• Remove relay, and measure at relay box side.
• Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Check and repair harness between battery
and A-09X (terminal No. 4) radiator fan
control relay connector.
• Check power supply line for
open/short circuit.
STEP 7. Connector check: A-17 fan controller
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
AK305263
3
1
2
4
AB
A-09X
Harness side
connector
Connector: A-09X
AK305263
3
1
2
4
AB
A-09X
Harness side
connector
Connector: A-09X
AK305256
1
2
3
AB
Connector: A-17
A-17 (GR)
Harness side connector
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