Mitsubishi Grandis. Manual — part 757
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-279
STEP 3. MUT-III other system diagnosis codes
• Confirm whether Diagnosis Code U1110
A/C-ECU time-out is output from the following
ECU having CAN communication with A/C ECU.
a. ETACS-ECU
Q: Is the diagnosis code output?
YES :
Go to Step 4 .
NO :
Go to Step 5 .
STEP 4. MUT-III diagnosis code
• Reconfirm whether the diagnosis codes are
output from engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
a. Erase the diagnosis codes being output.
b. Ignition switch: "LOCK" (OFF) to ON
c. Confirm whether the diagnosis codes are
output.
Q: Is the diagnosis code output?
YES :
replace A/C-ECU. Then go to Step 6 .
NO :
Intermittent malfunction in CAN busline
between engine-ECU <M/T> or
engine-A/T-ECU <A/T> and A/C-ECU
(Refer to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 5. MUT-III diagnosis code
• Reconfirm whether the diagnosis codes are
output from engine-ECU<M/T> or
engine-A/T-ECU <A/T>.
a. Erase the diagnosis codes being output.
b. Ignition switch: "LOCK" (OFF) to ON
c. Confirm whether the diagnosis codes are
output.
Q: Is the diagnosis code output?
YES :
Replace engine-ECU<M/T> or
engine-A/T-ECU <A/T>. Then go to Step 6 .
NO :
Intermittent malfunction in CAN busline
between engine-ECU <M/T> or
engine-A/T-ECU <A/T> and A/C-ECU
(Refer to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 6. MUT-III diagnosis code
• Reconfirm whether the diagnosis codes are
output from engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
a. Erase the diagnosis codes being output.
b. Ignition switch: "LOCK" (OFF) to ON
c. Confirm whether the diagnosis codes are
output.
Q: Is the diagnosis code output?
YES :
Go to Step 1 .
NO :
check end.
INSPECTION CHART FOR TROUBLE SYMPTOMS
M1131151501053
Items
Trouble symptom
Inspection
procedure
No.
Communication
with MUT-III is
impossible
Communication with engine-ECU <M/T> or engine-A/T-ECU <A/T> only
is not possible
1
Engine warning
lamp
The engine warning lamp does not illuminate right after the ignition switch
is turned the "ON" position
2
The engine warning lamp remains illuminating and never goes out
3
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-280
Starting
Starting impossible
(No initial combustion)
The starter is impossible to operate. 4 <M/T>,
5 <A/T>
Starting impossible
(Starter operative but no initial
combustion)
The starter is operative and cranks
the engine, but none of initial
combustion is in the cylinders and
the engine is not started.
6
Starting impossible
(Initial combustion but no complete
combustion)
The initial combustion occurs, but
the engine stalls soon due to the
incomplete combustion.
7
Improper starting
(Long time to start)
It is long cranking to start the engine.
Improper idling
Unstable idling
(Rough idling, hunting)
The engine speed is not constant
and changeable during the idling.
Usually, the judgment can be based
on the movement of the tachometer
pointer, also on the vibration
transmitted to the steering wheel, sift
lever, vehicle body and so on.
8
Improper idling speed
The proper idling speed is not
satisfied.
Engine stalled during idling
(Die out)
The engine stalls during the idling in
no relation to the vehicle movement.
Engine stalls
The engine stalls when starting the
car
(Pass out)
The engine stalls during the
operation, or when the accelerator
pedal is depressed from the idling.
9
The engine stalls when
decelerating
The engine stalls at the deceleration. 10
Items
Trouble symptom
Inspection
procedure
No.
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-281
Driving
Engine does not revolve up
The engine speed is not higher when
the accelerator pedal is depressed.
11
Hesitation, sag
The response of vehicle speed
(engine speed) is delayed when the
accelerator pedal is depressed, or
the vehicle speed (engine speed) is
temporarily dropped during the
acceleration. These phenomena are
called "hesitation" and the serious
hesitation is called "sag".
12
Poor acceleration
The engine cannot obtain the
acceleration corresponding to the
degree of throttle opening although
the engine is smooth at the constant
speed.
Stumble
The engine speed increase is
delayed when the accelerator pedal
is initially depressed at the starting.
Surge
The vehicle body is repeated to
vibrate jollity in the forward and
backward directions at the constant
speed or acceleration.
The feeling of impact or vibration
when accelerating
The large impact feeling occurs at
the acceleration.
13
The feeling of impact or vibration
when decelerating
The large impact feeling occurs at
the deceleration.
14
Knocking
Sharp sound like a hammer striking
on the cylinder walls during the
driving can be heard and wrongly
affects the driving.
15
Ignition timing offset
The basic ignition timing is deviated
from the datum value.
16
Stopping
Run on (Dieseling)
The engine continues to run after the
ignition switch is in "LOCK (OFF)"
position.
17
Exhaust gas
Odor, white smoke, black smoke,
high-concentration CO/HC during
idling
The exhaust gas is extremely rank
odor, white smoke or black smoke.
The concentration of CO & HC is
high during the idling.
18
Items
Trouble symptom
Inspection
procedure
No.
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-282
PROBLEM SYMPTOMS TABLE
Charging
performance
Battery rundown
The battery is soon rundown or the
charging ability of battery is small.
19
Cooling
performance
Overheating
The temperature of engine cooling
water is extremely high.
20
Abnormal rotation of fan Motor
The fan motor is abnormally rotated
when the ignition switch is in "ON"
position in no relation to the engine
cooling water temperature.
21
Items
Trouble symptom
Inspection
procedure
No.
Inspection
procedure
No.
Trouble symptom
Reference
page
1
Communication with engine-ECU <M/T> or engine-A/T-ECU <A/T> only is not
possible
2
The engine warning lamp does not illuminate right after the ignition switch is
turned the "ON" position
3
The engine warning lamp remains illuminating and never goes out
4
Starting impossible (No initial combustion) <M/T>
5
Starting impossible (No initial combustion) <A/T>
6
Starting impossible (Starter operative but no initial combustion)
7
Starting impossible (Initial combustion but no complete combustion)
Starting impossible (Long time to start)
8
Unstable idling (Rough idling, hunting)
Improper idling speed (Too high or too low)
Engine stalls during idling (Die out)
9
The engine stalls when starting the car (pass out)
10
The engine stalls when decelerating
11
Engine does not revolve up
12
Hesitation, sag
Poor acceleration
Stumble
Surge
13
The feeling of impact or vibration when accelerating
14
The feeling of impact or vibration when decelerating
15
Knocking
16
Ignition timing offset
17
Run on (Dieseling)
18
Odor, white smoke, black smoke, high-concentration CO/HC during idling
19
Battery rundown
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