Mitsubishi Galant (2004+). Manual — part 1086
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-37
NOTE: Do not replace the powertrain control module (PCM) until a through terminal check reveals there are
no short/open circuits.
NOTE: Check that the PCM ground circuit is normal before checking for the cause of the problem.
NOTE: After the PCM detects a malfunction, a diagnostic trouble code is recorded the next time the engine is
started and the same malfunction is re-detected. However, for items marked with a "*", the diagnostic trouble
code is recorded on the first detection of the malfunction.
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 closest to the engine.
NOTE: Bank 1 indicates the right bank side cylinder, and Bank 2 indicates the left bank side cylinder.
SYMPTOM CHART
M1131151500726
CAUTION
During diagnosis, a DTC associated with other
system may be set when the ignition switch is
turned on with connector(s) disconnected. On
completion, confirm all systems for DTC(s). If
DTC(s) are set, erase them all.
CAUTION
Disconnecting the battery cables or removing the
combination meter will erase the learned value of
the fuel gauge. To recover the learned value,
input a vehicle speed (by actually driving the
vehicle or inputting a simulated vehicle speed),
and stop the vehicle. This will complete the learn-
ing process.
.
NOTE: Check that the PCM ground circuit is normal
before checking for the cause of the problem.
U1102
ABS
−ECU time−out
U1108*
Combination meter time
−out
U1110
A/C
−ECU time−out
DTC
DIAGNOSTIC ITEM
REFERENCE
PAGE
TROUBLE SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE PAGE
Communication
with scan tool is
impossible
Communication with all systems is not possible
1
Communication with PCM only is not possible
2
Malfunction
Indicator Lamp
(SERVICE
ENGINE SOON
or Check
Engine Lamp)
and related
parts
The Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) does not illuminate
right after the ignition switch is turned to the "ON"
position
3
The Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) remains illuminated
and never goes out
4
Starting
Cranks, won't start
5
Starts up and dies
6
Hard starting
7
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-38
.
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Idling stability
(improper
idling)
Unstable idle (rough idle, hunting)
8
Idle speed is high (improper idle speed)
9
Idle speed is low (improper idle speed)
10
Idling stability
(engine stalls)
When the engine is cold, it stalls at idle (die out)
11
When the engine is hot, it stalls at idle (die out)
12
The engine stalls when accelerating (pass out)
13
The engine stalls when decelerating
14
Driving
Hesitation, sag or stumble
15
Acceleration shock
16
Deceleration shock
17
Poor acceleration
18
Surge
19
Knocking
20
Dieseling (Run-on)
21
Too high CO and HC concentration when idling
22
IM240 test
failure
Transient, mass emission tailpipe test failure
23
Purge flow test of the evaporative emission canister
failure
24
Pressure test of the evaporative system failure
25
Generator output voltage is low (approximately 12.3 volts)
26
Fans (radiator fan, A/C condenser fan) are inoperative
27
Power supply system and ignition switch-IG system
28
Fuel pump system
29
Ignition switch-ST system and transmission range switch system
30
Ignition circuit system
31
A/C system
32
TROUBLE SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE PAGE
ITEMS
SYMPTOM
At starting
Won't start
The starter cranks the engine, but there is no combustion within the
cylinders, and the engine won't start.
Starts up and
dies
The engine starts, but then engine soon stalls.
Hard starting
Engine starts after cranking a while.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-39
Idling stability
Hunting
Engine speed doesn't remain constant; changes at idle.
Rough idle
Usually, a judgement can be based upon the movement of the
tachometer pointer, and the vibration transmitted to the steering wheel,
shift lever, body, etc.
Incorrect idle
speed
The engine doesn't idle at the correct speed.
Engine stall (die
out)
The engine stalls when the foot is taken from the accelerator pedal,
regardless of whether the vehicle is moving or not.
Engine stall
(pass out)
The engine stalls when the accelerator pedal is depressed.
At driving
Hesitation Sag
"Hesitation" is the delay in
response of the vehicle speed
(engine speed). This occurs when
the accelerator is depressed in
order to accelerate from the speed
at which the vehicle is now
traveling, or a temporary drop in
vehicle speed (engine speed)
during such acceleration.
Serious hesitation is called "sag".
Poor
acceleration
Poor acceleration is inability to obtain an acceleration corresponding to
the degree of throttle opening, even though acceleration is smooth.
Also the inability to reach maximum speed.
Stumble
Engine speed increase is delayed
when the accelerator pedal is
initially depressed for acceleration.
Shock
The feeling of a comparatively large impact or vibration when the
engine is accelerated or decelerated.
Surge
This is slight acceleration and deceleration feel usually felt during
steady, light throttle cruise. Most notable under light loads.
Knocking
A sharp sound during driving, which sounds like a hammer striking the
cylinder walls. It makes poor driveability.
At stopped
Run on
("Dieseling")
The condition in which the engine continues to run after the ignition
switch is turned to the "LOCK" (OFF) position. Also called "dieseling".
ITEMS
SYMPTOM
AKX01361
VEHICLE
SPEED
TIME
NORMAL
HESITATION
SAG
INITIAL
ACCELE-
RATOR
PEDAL
DEPRE-
SSION
AKX01361AB
AKX01362
VEHICLE
SPEED
TIME
NORMAL
STUMBLE
INITIAL
ACCEL-
ERATOR
PEDAL
DEP-
RESSION
IDLING
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-40
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC P0101: Mass Airflow Circuit Range/Performance Problem
CAUTION
If DTC P0101 has been set, TCL related DTC
U1120 is also set. After P0101 has been diag-
nosed, don't forget to erase DTC U1120.
RED
RED-
WHITE
RED-
WHITE
RED-
WHITE
AK302832
B-10
B-17X
MFI
RELAY
BATTERY
MASS AIRFLOW
SENSOR
2
1
2
4
3
Mass Airflow Sensor Circuit
1
2
3
4
1
2
3 4
WHITE-GREEN
BLA
CK
POWERTRAIN CONTROL
MODULE (PCM)
108
3
69
4
B-22
B-21
HEAT
SENSITIZING
RESISTANCE
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
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
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