Mitsubishi Grandis. Manual — part 18

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-69

Step 5. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
CAN bus lines between the engine-A/T-ECU
<A/T> or the engine-ECU <M/T> and the
ETACS-ECU (Refer to GROUP 00

− How to

Use Troubleshooting/Inspection Service
Points

P.00-5

).

NO :

Replace the ETACS-ECU, and then go to
Step 6.

Step 6. Check whether the diagnosis code is
reset.

Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

The procedure is complete.

NO :

Return to Step 1.

Diagnosis code No.12 Engine-A/T-ECU time-out (related to A/T)

CAUTION

If diagnosis code No.12 is set in the ETACS,
diagnose the CAN main bus line.

CAUTION

Whenever the ECU is replaced, ensure that the
communication circuit is normal.

TROUBLE JUDGMENT

• The ETACS-ECU receives engine and

transmission control-related signals from the
engine-A/T-ECU via the CAN bus lines. If the
ECU cannot receive the transmission control
signal at all, diagnosis code No.12 will be set.

NOTE: For M/T-vehicles, diagnosis code No.12 does
not mean that there is a problem.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus

lines between the ETACS-ECU and the
engine-A/T-ECU, the power supply system to the
engine-A/T-ECU, or the ETACS-ECU itself may
be defective.

Past trouble

• If diagnosis code No.12 is stored as a past

trouble, carry out diagnosis with particular
emphasis on wiring and connector(s) in the CAN
bus line between the ETACS-ECU and the
engine-A/T-ECU, and the power supply system to

the engine-A/T-ECU. For diagnosis procedures,
refer to "How to treat past trouble" (Refer to
GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NOTE: For a past trouble, you can not find it by the

MUT-III CAN bus diagnostics even if there is any
failure in CAN bus lines. In this case, refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

and check the CAN bus lines. You can narrow
down the possible cause of the trouble by
referring to the diagnosis code, which is set
regarding the CAN communication-linked ECUs
(Refer to GROUP 54D

−

CAN Bus Line

Diagnostic Flow

P.54D-9

).

POSSIBLE CAUSES

• Malfunction of the engine-A/T-ECU

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D

− Diagnosis

P.54D-16

). Repair the

CAN bus line and go to Step 6.

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-70

Step 2. Check for A/T control-related diagnosis
code.

Check if an A/T system diagnosis code is set.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Diagnose the automatic transmission
system (Refer to GROUP 23

−

Troubleshooting

P.23A-17

).

Step 3. MUT-III diagnosis code

Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.

• Combination meter

U1101: Engine-related time-out diagnosis code

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 4.

Step 4. Check whether the diagnosis code is
reset.

Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
CAN bus lines between the engine-A/T-ECU
and the ETACS-ECU (Refer to GROUP 00

−

How to Use Troubleshooting/Inspection
Service Points

P.00-5

).

NO :

Replace the engine-A/T-ECU, and then go
to Step 6.

Step 5. Check whether the diagnosis code is
reset.

Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
CAN bus lines between the engine-A/T-ECU
and the ETACS-ECU (Refer to GROUP 00

−

How to Use Troubleshooting/Inspection
Service Points

P.00-5

).

NO :

Replace the ETACS-ECU, and then go to
Step 6.

Step 6. Check whether the diagnosis code is
reset.

Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

The procedure is complete.

NO :

Return to Step 1.

Diagnosis code No.13 A/C-ECU time-out

CAUTION

If diagnosis code No.13 is set in the ETACS-ECU,
diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.

TROUBLE JUDGMENT

The ETACS-ECU receives air conditioner
system-related signal from the A/C-ECU. If air
conditioner control system-related signal can not be
received at all, diagnosis code No.13 will be set.

COMMENT ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus

lines between the A/C-ECU and the
ETACS-ECU, the power supply system to the
combination meter, the combination meter itself,
or the ETACS-ECU may be defective.

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-71

Past trouble

• If diagnosis code No.13 is stored as a past

trouble, carry out diagnosis with particular
emphasis on wiring and connector(s) in the CAN
bus line between the ETACS-ECU and the
A/C-ECU, and the power supply system to the
A/C-ECU. For diagnosis procedures, refer to
"How to treat past trouble" (Refer to GROUP 00

−

How to Use Troubleshooting/Inspection Service
Points

P.00-5

).

NOTE: For a past trouble, you can not find it by the

MUT-III CAN bus diagnostics even if there is any
failure in CAN bus lines. In this case, refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

and check the CAN bus lines. You can narrow
down the possible cause of the trouble by
referring to the diagnosis code, which is set
regarding the CAN communication-linked ECUs
(Refer to GROUP 54D

−

CAN Bus Line

Diagnostic Flow

P.54D-9

).

POSSIBLE CAUSES

• Malfunction of the A/C-ECU

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D

− Diagnosis

P.54D-16

). Repair the

CAN bus line and go to Step 5.

Step 2. MUT-III diagnosis code

Check if an A/C-ECU diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the A/C-ECU (Refer to GROUP

55

− Troubleshooting

P.55-8

<vehicles

without multi-centre display> or

P.55-8

<vehicles with multi-centre display>).

NO :

Go to Step 3.

Step 3. Check whether the diagnosis code is
reset.

Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: ON

→ LOCK (OFF) → ON

(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
CAN bus lines between the A/C-ECU and
the ETACS-ECU (Refer to GROUP 00

−

How to Use Troubleshooting/Inspection
Service Points

P.00-5

).

NO :

Replace the A/C-ECU, and then go to Step
4.

Step 4. Check whether the diagnosis code is
reset.

Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: ON

→ LOCK (OFF) → ON

(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
CAN bus lines between the A/C-ECU and
the ETACS-ECU (Refer to GROUP 00

−

How to Use Troubleshooting/Inspection
Service Points

P.00-5

).

NO :

Replace the ETACS-ECU, and then go to
Step 5.

Step 5. Check whether the diagnosis code is
reset.

Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: ON

→ LOCK (OFF) → ON

(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

The procedure is complete.

NO :

Return to Step 1.

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-72

Diagnosis code No.14 Meter time-out

CAUTION

If diagnosis code No.14 is set in the ETACS-ECU,
diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.

TROUBLE JUDGMENT

The ETACS-ECU receives combination
meter-related signal from the combination meter. If
meter-related signal can not be received at all,
diagnosis code No.14 will be set.

COMMENT ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus

lines between the combination meter and the
ETACS-ECU, the power supply system to the
combination meter, the combination meter itself,
or the ETACS-ECU may be defective.

Past trouble

• If diagnosis code No.14 is stored as a past

trouble, carry out diagnosis with particular
emphasis on wiring and connector(s) in the CAN
bus line between the combination meter and the
ETACS-ECU, and the power supply system to the
combination meter. For diagnosis procedures,
refer to "How to treat past trouble" (Refer to
GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NOTE: For a past trouble, you can not find it by the

MUT-III CAN bus diagnostics even if there is any
failure in CAN bus lines. In this case, refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

and check the CAN bus lines. You can narrow
down the possible cause of the trouble by
referring to the diagnosis code, which is set
regarding the CAN communication-linked ECUs
(Refer to GROUP 54D

−

CAN Bus Line

Diagnostic Flow

P.54D-9

).

POSSIBLE CAUSES

• Malfunction of the combination meter

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D

− Diagnosis

P.54D-16

). Repair the

CAN bus line and go to Step 6.

Step 2. MUT-III diagnosis code
Check whether the combination meter-related
diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the combination meter (Refer to

GROUP 54A

− Troubleshooting

P.54A-35

).

NO :

Go to Step 3.

Step 3. MUT-III diagnosis code
Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.

• Engine

U1108: Combination meter time-out diagnosis code

Q: Is the diagnosis code set?

YES :

Go to Step 4.

NO :

Go to Step 5.

Step 4. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is

not reset.

Q: Is the check result normal?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
CAN bus lines between the combination
meter and the ETACS-ECU (Refer to
GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NO :

Replace the combination meter, and then go
to Step 6.