Mitsubishi 380. Manual - part 14

 

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Mitsubishi 380. Manual - part 14

 

 

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-53

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Replace the ETACS-ECU. On completion, verify that 

the DTC is not reset.

NO :  A poor connection, open circuit or other intermittent 

malfunction is present in the CAN bus lines between 
the multi center display  and the ETACS-ECU (Refer 
to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-14

).

 DTC 021  (U1128): Failure Information on Combination Meter.

CAUTION

If  DTC 021  (U1128) is set in the ETACS-ECU, 
always diagnose the CAN main bus line.

CAUTION

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

CAUTION

The combination meter- related DTC may be set 
when  DTC 021  (U1128) is set. (For details refer 
to GROUP 00, Affiliated DTC Reference Table 

P.00-17

.) Diagnose the combination meter first 

when the combination meter- related DTC is set.

.

TROUBLE JUDGMENT

The ETACS-ECU receives combination 
meter-related signal from the combination meter via 
the CAN bus lines. If a fail-safe related data is con-
tained in the signal from the combination meter,  
DTC 021  (U1128) will be stored.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The wiring harness wire or connectors may have 

loose, corroded, or damage terminals, or termi-
nals pushed back in the connector, the Engine- 
ECU, the combination meter or the ETACS-ECU 
may be defective.

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-54

Past trouble

• If  DTC 021  (U1128) 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 cope with past trouble" (Refer to 
GROUP 00, How to treat past trouble 

P.00-16

).

NOTE: You cannot find a past trouble, by the 
MUT-III CAN bus diagnostics even if there is a 
failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Cope with Intermittent Mal-
function 

P.00-14

 and check the CAN bus lines. 

You can narrow down the possible cause of the 
trouble by referring to the DTC, which is set 
regarding the CAN communication-linked ECUs 
(Refer to GROUP 54C, CAN Bus Line Diagnos-
tics  

P.54C-6

).

.

TROUBLESHOOTING HINTS

• The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: DIAGNOSTIC TOOL (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Using diagnostic tool MB991958, diagnose the 
CAN bus line.

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958. Refer to "How to 

connect SWS monitor 

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-5

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-55

STEP 2. Using diagnostic tool MB991958, read the Engine 
ECU and A/T ECU diagnostic trouble code.
Check whether engine and automatic transaxle DTCs are set 
or not.
(1) Turn the ignition switch to the "ON" position.
(2) Check for engine and automatic transaxle DTCs.
(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the Engine ECU (Refer to GROUP 13A, 

Diagnosis  

P.13A-5

), and GROUP 23A Automatic 

transmission ECU, Diagnosis 

P.23A-12

.

NO :  Go to Step 3.

STEP 3. Using diagnostic tool MB991958, read the 
combination meter diagnostic trouble code.
Check whether the combination meter-related DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the combination meter-related DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the combination meter (Refer to GROUP 

54A, Diagnosis 

P.54A-46

).

NO :  Go to Step 4.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-56

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Replace the ETACS-ECU. On completion, verify that 

the DTC is not reset.

NO :  There is an intermittent malfunction such as poor 

engaged connector(s) or open circuit (Refer to 
GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-14

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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