Mitsubishi Lancer Evolution IX. Manual — part 467
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-343
STEP 2. Connector check: C-117 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. M.U.T.-II/III data list
• Item No. 28: A/C switch
a. Engine: Idling
b. A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is
25
°C or less
OK:
ON (when A/C is ON)
OFF (when A/C is OFF)
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Replace the engine-ECU.
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-344
Inspection Procedure 28: A/C Compressor Relay System
3
4 5 6
1 2
1
2
3
4
1
AK501833
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
R
IG2
ST
LOCK
ACC
IG1
5
7.5A
9
10A
L-B
W-B
W-B
W-B
P
Ignition switch
C-208
4
2
C-211
13
C-210
3<C-124> (
*1) or
1
<C-122> (
*2)
17 (
*1) or 11
(
*2)
J/C (2)
C-101
14 (
*1) or 8
(
*2)
J/B
A/C compressor relay
Battery
Relay box
L-G
B-Y
B-Y
L-G
W
W
1
2
A-13 (
*1)
1
1
4
C-31 (
*2)
6
3
B-13X
A-36
MU802653
A/C refrigerant
temperature
switch
A/C compressor
assembly
Magnetic
clutch
4
C-31 (*2)
A-29 (*1)
6
A/C compressor relay Circuit
20
AB
C-121
(MU803784)
Engine-ECU
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
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-345
OPERATION
• The battery voltage is applied to the A/C com-
pressor relay (terminal No. 1).
• The battery voltage is applied to the A/C com-
pressor relay (terminal No. 2) from the ignition
switch. The engine-ECU (terminal No. 20) makes
the power transistor in the unit be in "ON" posi-
tion and makes currents go on the A/C compres-
sor relay coil, and that makes the relay be in "ON"
position.
• When the A/C compressor is in "ON" position, the
battery voltage is supplied to the A/C compressor
(terminal No. 4) from the A/C compressor relay
assembly (terminal No. 1).
FUNCTION
• When the A/C switch "ON" signal is input to the
engine-ECU, the engine-ECU places the A/C
compressor relay in the "ON" position. Accord-
ingly, the battery voltage supplied to the A/C com-
pressor operates the magnet clutch.
PROBABLE CAUSES
• Failed A/C compressor relay
• Failed A/C compressor magnet clutch
• Open/short circuit in A/C compressor relay circuit
or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE:
.
*1: L.H. drive vehicles
*2: R.H. drive vehicles
STEP 1. Connector check: B-13X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. A/C compressor relay check.
• Check A/C compressor relay (Refer to GROUP
55
− On-vehicle Service − Power Relay Check
).
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the A/C compressor relay.
STEP 3. Perform voltage measurement at B-13X
A/C compressor relay 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 5 .
NO :
Go to Step 4 .
AK305270
2
1
3
4
B-13X
Connector: B-13X
AB
Harness side
connector
Relay box’s
triangle marks
AK305270
2
1
3
4
B-13X
Connector: B-13X
AB
Harness side
connector
Relay box’s
triangle marks
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-346
STEP 4. Connector check: C-208 ignition switch
connector
Q: Is the check result normal?
YES :
Check intermediate connectors C-124
*1
or
C-122
*2
, C-210 and C-211, and repair if
necessary. If intermediate connectors are
normal, check and repair harness between
B-13X (terminal No. 2) A/C compressor
relay connector and C-208 (terminal No. 4)
ignition switch connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace the connector.
STEP 5. Perform voltage measurement at B-13X
A/C compressor relay connector.
• Remove relay, and measure at relay box side.
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Check intermediate connector A-29
*1
or
C-31
*2
, and repair if necessary. If
intermediate connector is normal, check and
repair harness between B-13X (terminal No.
1) A/C compressor relay connector and
battery.
• Check power supply line for
open/short circuit.
STEP 6. Connector check: A-36 A/C compressor
assembly connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace the connector.
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
AK305270
2
1
3
4
B-13X
Connector: B-13X
AB
Harness side
connector
Relay box’s
triangle marks
AK305270
2
1
3
4
B-13X
Connector: B-13X
AB
Harness side
connector
Relay box’s
triangle marks
AK502005
1
AB
Connector: A-36
Harness side
connector
A-36 (B)
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