Mitsubishi Lancer Evolution IX. Manual — part 464
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-331
OPERATION
• The battery voltage is applied on the engine-ECU
(terminal No. 31) form the condenser fan control
relay (low).
• The battery is applied on the engine-ECU (termi-
nal No. 30) from the condenser fan control relay
(high).
FUNCTION
• The engine-ECU condenser fan control relay
turns "ON" with the signal from the engine-ECU,
and power is supplied to the condenser fan
motor.
PROBABLE CAUSES
• Failed condenser fan relay (high)
• Failed condenser fan relay (low)
• Failed condenser fan motor
• Open/short circuit in condenser fan control relay
circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE:
.
*1: L.H. drive vehicles
*2: R.H. drive vehicles
STEP 1. Check condenser fan motor.
• Check condenser fan motor (Refer to GROUP 55
− Heater, Air conditioner and Ventilation
−Condenser and condenser fan motor − Inspec-
tion
).
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Replace the condenser fan motor.
STEP 2. M.U.T.-II/III actuator test
• Item No. 38: Condenser fan (low)
OK: Condenser fan motor rotates (low)
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Go to Step 14 .
STEP 3. Connector check: A-06X condenser fan
relay (low) connector.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace the connector.
STEP 4. Check condenser fan relay (low).
• Check condenser fan relay (low) (Refer to
GROUP 55
− On-vehicle Service
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Replace the condenser fan relay (low).
STEP 5. Perform voltage measurement at A-06X
condenser fan relay (low) connector.
• Remove relay, and measure at relay box side.
• Ignition switch: "ON"
• Voltage between terminal No. 2 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
AK305265
2
1
3
4
Relay box's
triangle marks
AB
A-06X
Harness side
connector
Connector: A-06X
AK305265
2
1
3
4
Relay box's
triangle marks
AB
A-06X
Harness side
connector
Connector: A-06X
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-332
STEP 6. Connector check: C-208 ignition switch
connector.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace the connector.
STEP 7. Check ignition switch.
• Check ignition switch (Refer to GROUP 54A −
Ignition switch
− Ignition switch − Inspection
).
Q: Is the check result normal?
YES :
Check intermediate connectors C-101,
C-129, C-210 and C-211, and repair if
necessary. If intermediate connectors are
normal, check and repair harness between
A-06X (terminal No. 2) condenser fan relay
(low) connector and C-208 (terminal No. 4)
ignition switch connector.
• Check power supply for open circuit
and damage.
NO :
Replace the ignition switch.
AK305251
1
2
3
4
5
6
Harness side connector
Connector: C-208
C-208
<L. H. drive vehicles>
<R. H. drive vehicles>
C-208
AB
AK305265
2
1
3
4
Relay box's
triangle marks
AB
A-06X
Harness side
connector
Connector: A-06X
AK305251
1
2
3
4
5
6
Harness side connector
Connector: C-208
C-208
<L. H. drive vehicles>
<R. H. drive vehicles>
C-208
AB
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-333
STEP 8. Perform voltage measurement at A-06X
condenser fan relay (low) 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 :
Check and repair harness between battery
and A-08X (terminal No. 4) condenser fan
relay connector.
• Check power supply for open circuit
and damage.
NO :
Go to Step 9 .
STEP 9. Perform voltage measurement at C-121
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Ignition switch: "ON"
• Voltage between terminal No. 31 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Go to Step 10 .
AK305265
2
1
3
4
Relay box's
triangle marks
AB
A-06X
Harness side
connector
Connector: A-06X
AK501995
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
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-334
STEP 10. Connector check: C-121 engine-ECU
connector.
Q: Is the check result normal?
YES :
Check intermediate connectors A-29*
1
or
C-31*
2
, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between A-06X (terminal
No. 3) condenser fan relay (low) connector
and C-121 (terminal No. 31) engine-ECU
connector.
• Check power supply for open circuit
and damage.
NO :
Repair or replace the connector.
STEP 11. Perform voltage measurement at A-34
condenser fan motor connector.
• Disconnect connector, and measure at harness
side.
• Disconnect C-121 engine-ECU connector, and
earth terminal No. 31.
• Ignition switch: "ON"
AK501995
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
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305265
2
1
3
4
Relay box's
triangle marks
AB
A-06X
Harness side
connector
Connector: A-06X
AK305266
1
2
A-34(B)
AB
Harness side
connector
Connector: A-34
AK305265
2
1
3
4
Relay box's
triangle marks
AB
A-06X
Harness side
connector
Connector: A-06X
AK501995
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
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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