Mitsubishi Eclipse. Manual — part 629
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1059
STEP 8. Check for open circuit between distributor
connector B-22 (terminal No. 2) and engine speed
detection connector A-12X (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then confirm that the
malfunction symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
AK300439
3
4
5
1
2
6
7
B-22 (B)
AB
CONNECTOR: B-22
HARNESS CONNECTOR:
COMPONENT SIDE
AK300747
1
CONNECTOR: A-12X
AB
A-12X
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1060
INSPECTION PROCEDURE 34: A/C system.
.
COMMENT
• When the A/C is "ON", the battery positive volt-
age is applied on the ECM (terminal 83) <M/T>
PCM (terminal 83) <A/T> from the automatic
compressor controller.
When battery positive voltage is applied to the
ECM <M/T> or PCM <A/T>, the ECM <M/T> or
PCM <A/T> turns "ON" the power transistor in the
ECM <M/T> or PCM <A/T>. The ECM <M/T> or
PCM <A/T> delays A/C engagement momentarily
while it increases idle rpm. Then the A/C com-
pressor clutch relay coil will be energized.
With this, the A/C compressor clutch relay turns
"ON", and the A/C compressor clutch functions.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the A/C control system.
• Malfunction of the A/C switch.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Malfunction of the ECM <M/T> or PCM <A/T>.
AK000721
GREEN-
RED
GREEN
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
83 <M/T>*2
83 <A/T>*4
20 <M/T>*1
20 <A/T>*3
A/C COMPRESSOR
RELAY
NOTE
*1:ECM connector C-51 <M/T>
*2:ECM connector C-62 <M/T>
*3:PCM connector C-52 <A/T>
*4:PCM connector C-59 <A/T>
AUTOMATIC
COMPRESSOR
CONTROLLER
98
78
71
88 89
76 77
72
79
91
73
80
74
75
81
92
82 83
93
84 85
94
86 87
95 96
90
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
97
C-62 <M/T>
(MU803783)
C-59 <A/T>
(MU803782)
C-51 <M/T>, C-52 <A/T>
(MU803784)
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
A/C Circuit
AK000225
CONNECTORS : C-51, C-62<M/T>,
C-52, C-59<A/T>
C-52
C-51
PCM<A/T>
ECM<M/T>
AM
C-59
C-62
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1061
DIAGNOSIS
STEP 1. Check connector C-51, C-62 at ECM <M/T> or
connector C-52, C-59 at PCM <A/T> for damage.
Q: Is the 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.
STEP 2. Check the circuit at ECM connector C-51 <M/T> or
PCM connector C-52 <A/T>.
(1) Disconnect the connectors C-51 <M/T> or C-52 <A/T> and
measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 20 and ground.
• Voltage should be battery positive voltage.
(4) Using a jumper wire, connect terminal 20 to ground.
• A/C compressor 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 : Go to Step 3.
NO : Refer to GROUP 55, Diagnosis
− Introduction To
Heater, Air Conditioning And Ventilation Diagnosis
. Then confirm that the malfunction symptom is
eliminated.
AK000225
CONNECTORS : C-51, C-62<M/T>,
C-52, C-59<A/T>
C-52
C-51
PCM<A/T>
ECM<M/T>
AM
C-59
C-62
AKX01448 AH
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
28
29
30
31
32
33
34
35
36
C-51<M/T>,C-52<A/T>
HARNESS SIDE
CONNECTOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1062
STEP 3. Check the circuit at ECM connector C-62 <M/T> or
PCM connector C-59.
(1) Disconnect the connectors C-62 <M/T> or C-59 <A/T> and
measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 83 and ground.
• Voltage should be 1 volt or less when the A/C switch is
"OFF".
• Voltage should be battery positive voltage when the A/C
switch is "ON".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Replace the ECM or PCM. Then confirm that the
malfunction symptom is eliminated.
NO : Refer to GROUP 55, Diagnosis
− Introduction To
Heater, Air Conditioning And Ventilation Diagnosis
.
DATA LIST REFERENCE TABLE
M1131152000876
CAUTION
• When shifting the select lever to D range, the brakes should be applied so that the vehicle does
not move forward.
• Driving tests always need two persons: one driver and one observer.
NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second close to the engine.
NOTE: Bank 1 indicates the right bank cylinder, and bank 2 indicates the left bank cylinder.
NOTE:
*1:
If the idle speed is lower than the standard value on a very cold engine [approximately -20
°
C
(-4
°
F)] even when the IAC motor is fully opened, the air volume limiter built in the throttle body could be
defective.
NOTE:
*2:
In a new vehicle [driven approximately 500 km (311 mile) or less], the step of the stepper motor is
sometimes 30 steps greater than the standard value.
NOTE:
*3:
The injector drive time represents the time when the cranking speed is at 250 r/min or below when
the power supply voltage is 11 volts.
NOTE:
*4:
In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is some-
times 10% longer than the standard time.
NOTE:
*5
: In a new vehicle [driven approximately 500 km (311 mile) or less], the volume airflow sensor output
frequency is sometimes 10% higher than the standard frequency.
NOTE:
*6
: Applicable to GST
AK000389
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
C-62 HARNESS
SIDE CONNECTOR
AC
<M/T>
AKX01449
<A/T>
C-59 HARNESS
SIDE CONNECTOR
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
AH
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