Mitsubishi Eclipse. Manual — part 134
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-29
.
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Ignition switch-ST system <M/T>
31
Ignition switch-ST system and transmission range switch system <A/T>
32
Ignition circuit system
33
A/C system
34
SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE
PAGE
ITEMS
SYMPTOM
Starting
Won't start
The starter is used to crank 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 the engine soon stalls.
Hard starting
Engine starts after cranking a while.
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 usual 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 or while it is
being used.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-30
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 or
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 like a hammer striking the cylinder walls.
Stopping
Dieseling (run
on)
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
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-31
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC P0101: Volume Airflow Circuit Range/Performance Problem
AK300331
1 2 3 4 5 6 7
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58 59
60 61 62 63
64 65 66
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
RED
RED
-
WHITE
RED
-
WHITE
47
1
41
10
RED
-
WHITE
GREEN-BL
UE
BROWN
WHITE-GREEN
82
78
81
80
89 90 91 92
79
87
71
74
73
72
76
75
77
85
88
83 84
86
B-14
MFI
RELAY
BATTERY
Volume Airflow Sensor Circuit
VOLUME
AIRFLOW
SENSOR
5 V
19 <M/T>*1
19 <A/T>*4
7
40 <M/T>*2
16 <A/T>*4
90 <M/T>*3
65 <A/T>*5
4
5
3
C-60 <M/T>
(MU803772)
C-50 <A/T>
(MU803784)
C-54 <A/T>
(MU803781)
NOTE
*1: ECM connector C-49 <M/T>
*2: ECM connector C-53 <M/T>
*3: ECM connector C-60 <M/T>
*4: PCM connector C-50 <A/T>
*5: PCM connector C-54 <A/T>
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
1
2
4
3
1
14
4
19
5
22
6
17
8
15
9
18
7
20
16
2
13
12
23 24 25 26
21
3
C-49 <M/T>
(MU803773)
10 11
C-53 <M/T>
(MU803771)
34
33
32
36
35
37
42
45
31
39
38
46
40 41
43 44
3 4
1 2
A-18X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-32
.
CIRCUIT OPERATION
• The volume airflow sensor power is supplied from
the MFI relay (terminal No. 4), and the ground is
provided on the ECM (terminal No. 40) <M/T> or
PCM (terminal No. 16) <A/T>.
• 5-volt power is applied to the volume airflow sen-
sor output terminal (terminal No. 3) from the ECM
(terminal No. 90) <M/T> or PCM (terminal No. 65)
<A/T>. The volume airflow sensor generates a
pulse signal when the output terminal and ground
are opened/closed (opened/short).
.
TECHNICAL DESCRIPTION
• While the engine is running, the volume airflow
sensor outputs a pulse signal which corresponds
to the volume of air flow.
• The ECM <M/T> or PCM <A/T> checks whether
the frequency of this signal output by the volume
airflow sensor while the engine is running is at or
above the set value.
• When the throttle position sensor output voltage
is low, the ECM <M/T> or PCM <A/T> causes the
power transistor to be "ON" to send an volume
airflow sensor reset signal to the volume airflow
sensor. In response to the reset signal, the vol-
ume airflow sensor resets the filter circuit and
improves the ability of the volume airflow sensor
to measure the amount of air in a small air intake
region.
.
DESCRIPTIONS OF MONITOR METHODS
Compare load value with volume airflow sensor out-
put frequency.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Throttle position sensor
.
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
AK300053
CONNECTOR: B-14
VOLUME AIRFLOW
SENSOR
AB
B-14 (B)
AK300060
ECM
CONNECTORS: C-49, C-53, C-60 <M/T>
AM
C-53 (G) C-60 (G)
C-49 (G)
AK300060
PCM
CONNECTORS: C-50, C-54 <A/T>
AO
C-54 (GR)
C-50 (GR)
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