Mitsubishi 380. Manual — part 482
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-20
NOTE:
• Check that the ENGINE-ECU ground circuit is normal before checking for the cause of the problem.
• After the ENGINE-ECU 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 diag-
nostic trouble code is recorded on the first detection of the malfunction.
• After the Check Engine Warning Lamp) illuminates, it will be switched off under the following conditions.
• When the ENGINE-ECU monitored the engine malfunction four times* and met set condition require-
ments, it detected no malfunction.
*: In this case, "one time" indicates from engine start to stop.
• For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant temper-
ature, etc.) are similar to those when the malfunction was first recorded.
• Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the sen-
sor mounted at the position second closest to the engine.
• Bank 1 indicates the right bank side cylinder, and Bank 2 indicates the left bank side cylinder.
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-21
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 learning process.
.
NOTE: Check that the ENGINE-ECU ground circuit is normal before checking for the cause of the problem.
TROUBLE SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE
PAGE
Communication
with diagnostic
tool is
impossible
Communication with all systems is not possible
1
Communication with ENGINE-ECU only is not
possible
2
Check Engine
Warning Lamp)
and related
parts
The Check Engine Lamp) does not illuminate right
after the ignition switch is turned to the "ON" position
3
The Check Engine Warning Lamp) remains illuminated
and never goes out
4
Starting
Cranks, won't start
5
Starts up and dies
6
Hard starting
7
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
Purge flow test of the evaporative emission canister
failure
23
Power supply system and ignition switch-IG system
24
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-22
.
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Fuel pump system
25
Ignition switch-ST system and transmission range switch system
26
Ignition circuit system
27
A/C system
28
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.
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.
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-23
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
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