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 

P.00-5

). 

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 

P.00-5

).

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

P.13A-283

2

The engine warning lamp does not illuminate right after the ignition switch is 
turned the "ON" position

P.13A-285

3

The engine warning lamp remains illuminating and never goes out

P.13A-285

4

Starting impossible (No initial combustion) <M/T>

P.13A-286

5

Starting impossible (No initial combustion) <A/T>

P.13A-292

6

Starting impossible (Starter operative but no initial combustion)

P.13A-297

7

Starting impossible (Initial combustion but no complete combustion)

P.13A-300

Starting impossible (Long time to start)

8

Unstable idling (Rough idling, hunting)

P.13A-301

Improper idling speed (Too high or too low)
Engine stalls during idling (Die out)

9

The engine stalls when starting the car (pass out)

P.13A-305

10

The engine stalls when decelerating

P.13A-305

11

Engine does not revolve up

P.13A-306

12

Hesitation, sag

P.13A-307

Poor acceleration
Stumble
Surge

13

The feeling of impact or vibration when accelerating

P.13A-308

14

The feeling of impact or vibration when decelerating

P.13A-309

15

Knocking

P.13A-309

16

Ignition timing offset

P.13A-309

17

Run on (Dieseling)

P.13A-311

18

Odor, white smoke, black smoke, high-concentration CO/HC during idling

P.13A-311

19

Battery rundown

P.13A-313