Mitsubishi Grandis. Manual - part 756

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-275

STEP 2. MUT-III diagnosis code
Reconfirm whether the diagnosis codes are output 
from Engine-ECU <M/T> or engine-A/T-ECU <A/T>.

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Are the diagnosis codes output?

YES : 

Replace engine-ECU <M/T> or 

engine-A/T-ECU <A/T>. Then go to Step 3 .

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

STEP 3. MUT-III diagnosis code
Reconfirm whether the diagnosis codes are output 
from engine-ECU <M/T> or engine-A/T-ECU <A/T>.

1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.

Q: Are the diagnosis codes output?

YES : 

Go to Step 1 .

NO : 

Check end.

Code No. U1102: ABS-ECU time-out

CAUTION

If Diagnosis Code U1102 is output from 
engine-ECU <M/T> or engine-A/T-ECU <A/T> 
surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the 
communication circuits are normal.

TROUBLE JUDGMENT

Check Conditions

• While the cranking switch is in OFF position, or 

when 3 seconds pass after the cranking switch is 
in OFF from ON.

• The battery voltage is 10V or more.

Judgment Criterion

• The signals cannot be received from ABS-ECU 

through CAN busline.

COMMENT ON TROUBLE SYMPTOM

Current malfunction

• The failure is possibly caused by malfunction of 

the harness and connector in CAN busline 
between engine-ECU <M/T> and ABS-ECU or 
between engine-A/T-ECU <A/T> and ABS-ECU, 
by malfunction in the power supply system of 
ABS-ECU, in ABS-ECU itself, in engine-ECU 
<M/T> or engine-A/T-ECU <A/T>.

Past malfunction

• Focus on diagnosing malfunction of the harness 

and connector in CAN busline between 
engine-ECU <M/T> and ABS-ECU or between 
engine-A/T-ECU as well as malfunction in the 
power supply system of ABS-ECU (Refer to 
GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NOTE: In case of Past trouble, MUT-III CAN bus 

diagnosis cannot detect the failure even if there is 
malfunction in CAN bus, so that check CAN 
busline in the same way as Intermittent 
malfunction (Refer to GROUP 00 

−

 How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

). The diagnosis codes being output to 

each ECU with CAN communication can narrow 
down the most suspected area. (Refer to 
GROUP 54D 

−

 Explanation About The MUT-III 

Can Bus Diagnostics 

P.54D-9

).

PROBABLE CAUSE

• Failed of the harness and the connector

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

• Failed ABS-ECU

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

• Using MUT-III, perform CAN busline diagnosis.

Q: Is the check result normal?

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-276

YES : 

Go to Step 2 .

NO : 

Correct CAN busline (Refer to GROUP54D 
− Diagnosis − Can Bus Diagnostic Chart 

P.54D-16

), and then go to Step 6 .

STEP 2. MUT-III other system diagnosis codes

• Confirm whether the diagnosis codes are output 

from ABS-ECU.

Q: Is the diagnosis code output?

YES : 

Perform the troubleshooting of ABS (Refer 

to GROUP 35B 

− Inspection Chart For 

Diagnosis Code 

P.35B-7

).

NO : 

Go to Step 3 .

STEP 3. MUT-III other system diagnosis codes

• Confirm whether Diagnosis Code U1102: 

ABS-ECU time-out is output from the following 
ECU having CAN communication with ABS-ECU

a. EPS-ECU
b. Combination meter-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  ABS-ECU. Then go to Step 6 .

NO : 

Intermittent malfunction in CAN busline 
between engine-ECU <M/T> and ABS-ECU 
or between engine-A/T-ECU <A/T> (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 ngine-ECU <M/T> or 
engine-A/T-ECU <A/T> and ABS-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.

Code No. U1108: Combination meter timeout

CAUTION

If Diagnosis Code U1108 is output from 
Engine-ECU <M/T> or engine-A/T-ECU <A/T> 
surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the 
communication circuits are normal.

TROUBLE JUDGMENT

Check Conditions

• While the cranking switch is in OFF position, or 

when 3 seconds pass after the cranking switch is 
in OFF from ON.

• The battery voltage is 10V or more.

Judgment Criterion

• The signals cannot be received from combination 

meter through CAN busline.

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-277

COMMENT ON TROUBLE SYMPTOM

Current malfunction

• The failure is possibly caused by malfunction of 

the harness and connector in CAN busline 
between engine-ECU <M/T>or engine-A/T-ECU 
<A/T> and combination meter or between 
engine-ECU <M/T> or engine-A/T-ECU <A/T> 
and combination meter, by malfunction in the 
power supply system of combination meter, in 
combination meter itself, in Engine-ECU <M/T> 
or engine-A/T-ECU <A/T>.

Past malfunction

• Focus on diagnosing malfunction of the harness 

and connector in CAN busline between 
engine-ECU <M/T> or engine-A/T-ECU <A/T> 
and combination meter as well as malfunction in 
the power supply system of combination meter. 
Refer to past trouble (Refer to GROUP 00 

− How 

to Use Troubleshooting/Inspection Service 
Points

P.00-5

) for the diagnosis procedure.

NOTE: In case of Past trouble, MUT-III CAN bus 

diagnosis cannot detect the failure even if there is 
malfunction in CAN bus, so that check CAN 
busline in the same way as Intermittent 
malfunction (Refer to GROUP 00 

−

 How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

). The diagnosis codes being output to 

each ECU with CAN communication can narrow 
down the most suspected area (Refer to GROUP 
54D 

−

 Explanation About The MUT-III Can Bus 

Diagnostics  

P.54D-9

).

PROBABLE CAUSE

• Failed of the harness and the connector

• Failed combination meter 

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

• Using MUT-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Correct CAN busline (Refer to Group 54D 

− 

Diagnosis 

− Can Bus Diagnostics Chart 

P.54D-16

), and then go to Step 6 .

STEP 2. MUT-III other system diagnosis codes.

• Confirm whether the diagnosis codes are output 

from combination meter.

Q: Is the diagnosis code output?

YES : 

Perform the troubleshooting of combination 

meter (Refer to GROUP 54A 

− combination 

meter 

− Inspection Chart For Diagnosis 

Code codes 

P.54A-35

).

NO : 

Go to Step 3 .

STEP 3. MUT-III other system diagnosis codes

• Confirm whether Diagnosis Code U1108: 

combination meter time-out is output from the 
following ECU having CAN communication with 
combination meter

a. ETACS-ECU

Q: Is the diagnosis code output?

YES : 

Go step 5 .

NO : 

Go step 4 .

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 combination meter. Then go to 

Step 6 .

NO : 

Temporary malfunction in CAN busline 
between engine-ECU <M/T> or 
engine-A/T-ECU <A/T> and combination 
meter (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?

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-278

YES : 

Replace engine-ECU <M/T> or 

engine-A/T-ECU <A/T>. Then go to Step 6 .

NO : 

Temporary malfunction in CAN busline 
between Engine-ECU <M/T> or 
engine-A/T-ECU <A/T> and combination 
meter (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 : 

The check is completed.

Code No. U1110: A/C-ECU timeout

CAUTION

If Diagnosis Code U1110 is output from 
Engine-ECU <M/T> or engine-A/T-ECU <A/T> 
surely perform CAN busline diagnosis.

CAUTION

Replace ECU after certainly confirming that the 
communication circuits are normal.

TROUBLE JUDGMENT

Check Conditions

• While the cranking switch is in OFF position, or 

when 3 seconds pass after the cranking switch is 
in OFF from ON.

• The battery voltage is 10V or more.

Judgment Criterion

• The signals cannot be received from A/C-ECU 

through CAN busline.

COMMENT ON TROUBLE SYMPTOM

Current malfunction

• The failure is possibly caused by malfunction of 

the harness and connector in CAN busline 
between engine-ECU <M/T> or engine-A/T-ECU 
<A/T> and A/C-ECU, by malfunction in the power 
supply system of A/C-ECU, in A/C-ECU itself, in 
engine-ECU <M/T> or engine-A/T-ECU <A/T>.

Past malfunction

• Focus on diagnosing malfunction of the harness 

and connector in CAN busline between 
engine-ECU <M/T> or engine-A/T-ECU <A/T> 
and A/C-ECU as well as malfunction in the power 
supply system of A/C-ECU. Refer to past trouble 
(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

) for the diagnosis procedure. 

NOTE: In case of Past trouble, MUT-III CAN bus 

diagnosis cannot detect the failure even if there is 
malfunction in CAN bus, so that check CAN 
busline in the same way as Intermittent 
malfunction (Refer to GROUP 00 

−

 How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).The diagnosis codes being output to 

each ECU with CAN communication can narrow 
down the most suspected area (Refer to GROUP 
54D 

−

 Explanation About The MUT-III Can Bus 

Diagnostics  

P.54D-9

).

PROBABLE CAUSE

• Failed of the harness and the connector

• Failed A/C-ECU

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

• Using MUT-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Correct CAN busline (Refer to Group 54D 

− 

Diagnosis 

− Can Bus Diagnostic Chart 

P.54D-16

), and then go to Step 6 .

STEP 2. MUT-III other system diagnosis codes

• Confirm whether the diagnosis codes are output 

from A/C-ECU.

Q: Is the diagnosis code output?

YES : 

Perform the troubleshooting of A/C-ECU 

(Refer to GROUP 55 Check Chart for 
Diagnosis Codes 

P.55-8

).

NO : 

Go step 3 .