Mitsubishi Lancer Evolution X. Manual — part 437
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-813
Inspection procedure 27: A/C system
AK900375
71 72 73 74 75 76 77 78 79 80 81 82
83 84 85 86 87 88 89 90 91 92 93 94
95 96 97 98 99
100 101 102 103 104
112 113 114
109
108
107
110 111
115 116
106
105
118
117
1
2
3
4
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
1
WHITE
WHITE
7
10A
ORANGE
A/C COMPRESSOR
CLUTCH RELAY
4
2
1
A-13X
B-14
MU802655
A-54
OFF
A/C
REFRIGERANT
TEMPERATURE
SWITCH
A/C COMPRESSOR CLUTCH ASSEMBLY
A/C
COMPRESSOR
CLUTCH
A/C COMPRESSOR CLUTCH RELAY CIRCUIT
102
AB
B-109
LIGHT
GREEN
LIGHT
GREEN
3
1
5
OFF
ON
ON
FUSIBLE LINK 36
ON
→
OFF
: 155˚C
OFF
→
ON
: 125˚C
RELAY BOX
(ENGINE COMPARTMENT)
ENGINE CONTROL MODULE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-814
.
CIRCUIT OPERATION
• When the A/C switch ON signal is input into the
ECM, the ECM turns ON the A/C compressor
relay. This causes battery positive voltage to be
supplied to the A/C compressor and the magnet
clutch actuates.
.
COMMENT
• When the A/C is "ON" the ECM turns "ON" the
power transistor in the ECM. The ECM delays
A/C engagement momentarily while it increases
idle speed. Then the A/C compressor clutch relay
coil will be energized.
With this, the A/C compressor clutch relay turns
"ON", and the A/C compressor clutch operates.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case: )
• Malfunction of the A/C control system.
• Open or shorted A/C compressor relay circuit,
harness damage, or connector damage.
• Malfunction of the ECM.
DIAGNOSIS
STEP 1. Check harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK704229AB
Connector: A-13
A-13
AK704605
Connector: A-17X
A/C compressor
clutch relay
A-17X
AB
AK704235 AB
Connector: B-10
ECM
B-10 (GR)
AK704604
Connector: B-110
B-110 (B)
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-815
STEP 2. Check the circuit at ECM connector B-10.
(1) Disconnect the connectors B-10 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 102 and ground.
• Voltage should be battery positive voltage.
(4) Using a jumper wire, connect terminal No. 102 to ground.
• A/C compressor clutch relay should turn "ON".
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and A/C compressor relay condition
normal?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Code Registration Judgment Table <Vehicles with
or GROUP 42C, Diagnosis − ID
Codes Registration Judgment Table <Vehicles with
WCM>
. Then confirm that the malfunction
symptom is eliminated.
NO : Refer to GROUP 55, Automatic A/C Diagnosis −
Diagnostic Trouble Code Chart
. Then confirm
that the malfunction symptom is eliminated.
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
100
101
102
103
104
105
106
112
113
114
109 108
107
110
111
115
116
117
118
AK700226AC
B-10 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-816
Inspection procedure 28: Engine oil pressure switch system
.
CIRCUIT OPERATION
• Battery voltage is applied to the oil pressure
switch (terminal No. 1) from the engine-ECU (ter-
minal No. 36).
.
COMMENT
• Detect the engine oil pressure conditions and
enter the result into the ECM. After starting the
engine if the oil pressure rises to higher than the
given pressure, the engine oil pressure switch
turns OFF. Under this condition the ECM sends
the command of turning off the oil warning lamp
to the combination meter via CAN.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Engine oil pressure switch failed.
• Open or shorted engine oil pressure switch cir-
cuit, harness damage, or connector damage.
• ECM failed.
AK704606
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
1
36
GRA
Y
ENGINE OIL
PRESSURE
SWITCH
B-15
1
ENGINE OIL PRESSURE SWITCH CIRCUIT
AB
B-09
OFF
ON
ENGINE
CONTROL
MODULE
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704607AB
B-15
Connector: B-15
Throttle
body
Engine oil
pressure switch
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