Mitsubishi Galant (2004+). Manual — part 1349
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1089
INSPECTION PROCEDURE 32: A/C system.
.
COMMENT
• When the A/C is "ON" the PCM turns "ON" the
power transistor in the PCM. The PCM delays
A/C engagement momentarily while it increases
idle r/min. 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.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Malfunction of the PCM.
GREEN
AK302882
81
POWERTRAIN CONTROL
MODULE (PCM)
A/C COMPRESSOR CLUTCH
RELAY
A/C Circuit
B-21
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
AK303119
CONNECTOR: B-21
PCM
AB
AIR CLEANER
B-21
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1090
DIAGNOSIS
STEP 1. Check harness connector B-21 at PCM 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.
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1091
STEP 2. Check the circuit at PCM connector B-21.
(1) Disconnect the connectors B-21 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 81 and ground.
• Voltage should be battery positive voltage.
(4) Using a jumper wire, connect terminal No. 81 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 PCM. Then confirm that the malfunction
sympton is eliminated.
NO : Refer to GROUP 55, Diagnosis
− Introduction To
Heater, Air Conditioning And Ventilation Diagnosis
. Then confirm that the malfunction symptom
is eliminated.
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
AK303276
B-21 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1092
DATA LIST REFERENCE TABLE
M1131152000940
CAUTION
• When shifting the selector 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
: In a new vehicle [driven approximately 500 km (311 mile) or less], the mass airflow sensor output
value is sometimes 10% higher than the standard value.
NOTE: *
2
: 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: *
3
: 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: *
4
: Applicable to GST
NOTE: *
5
: Vehicles for Canada, the headlight, taillight, etc. remain lit even when the lighting switch is in "OFF"
position but this is no problem for checks.
MUT-III SCAN
TOOL DISPLAY
ITEM NO.
INSPECTION ITEM
INSPECTION REQUIREMENT
NORMAL CONDITION
INSPECTION
PROCEDURE NO.
REFERENCE
PAGE
A/C
RELAY
49
A/C
compressor
clutch relay
• Engine: warming up, idling
• A/C switch: "OFF"
OFF
Procedure
No. 32
• Engine:
warming up,
idling
• A/C switch:
"ON"
A/C
compressor
clutch is not
operating
OFF
A/C
compressor
clutch is
operating
ON
APP SNS
(MAIN)
78
Accelerator
pedal position
sensor (main)
Ignition switch:
"ON"
Release the
accelerator
pedal
700
− 1,300
mV
Code No.
P2122,
P2123
,
Depress the
accelerator
pedal gradually
Increases in
response to
the pedal
depression
stroke
Depress the
accelerator
pedal fully
4,000 mV or
more
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