Mitsubishi Montero (2004+). Manual — part 136
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-31
.
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
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
Improper idle speed when the A/C is operating (A/C switch 2 signal)
26
A/C condenser fan is 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
Accelerator pedal position switch system
33
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)
13A-32
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)
13A-33
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC P0101: Volume Airflow Circuit Range/Performance Ploblem
1 2 3 4 5 6 7
3 4
1 2
RED
GREEN
WHITE-BLA
CK
SKY B
U
LE
WHITE-
BLA
C
K
WHITE-
BLA
C
K
AK201126
B-48
B-22X
MFI
RELAY
BATTERY
VOLUME AIRFLOW
SENSOR
POWERTRAIN CONTROL MODULE(PCM)
5 V
37
7
88
63
4
3
2
5
3
1
4
Volume Airflow Sensor Circuit
31
35363738394041 42 43
444546474849
50 51
5253
545556
57 58
32
33 34
D-133
(MU803803)
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
D-134
(MU803804)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-34
.
CIRCUIT OPERATION
• The volume airflow sensor power is supplied from
the MFI relay (terminal No. 1), and the ground is
provided on the PCM (terminal No. 88).
• 5-volt power is applied to the volume airflow sen-
sor output terminal (terminal No. 3) from the PCM
(terminal No. 63). The volume airflow sensor gen-
erates 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 PCM 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 PCM causes the power transistor to be
"ON" to send an volume airflow sensor reset sig-
nal to the volume airflow sensor. In response to
the reset signal, the volume airflow sensor resets
the filter circuit and improves the ability of the vol-
ume airflow sensor to measure the amount of air
in a small air intake region.
.
DESCRIPTIONS OF MONITOR METHODS
• An abnormal condition is detected in the volume
airflow sensor output through a comparison
between the driving load and the output fre-
quency of the volume airflow sensor.
.
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
.
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
AK201038AH
CONNECTORS: D-133, D-134
PCM
D-134(GR)
D-133(GR)
AK200940AD
B-48(B)
CONNECTOR: B-48
VOLUME AIRFLOW
SENSOR
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