Mitsubishi 380. Manual — part 432

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-268

STEP 25. Check the harness for open circuit or short
circuit to ground between A/T-ECU connector B-19
terminal 9 and shift switch assembly connector D-14
terminal 3.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair or replace the harness wire.

STEP 26. Check A/T-ECU connector B-19 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connector and terminals in good condition?

YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

10DB125A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-19

10DB093A

CONNECTOR: D-14

FLOOR

WIRING

HARNESS

ROOF

WIRING

HARNESS

D-14

10DB125A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-19

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-269

INSPECTION PROCEDURE 16: Shift Position Indicator Light System <Vehicles with Sport Mode>

CIRCUIT OPERATION

• The A/T-ECU detects the transmission range ("P,"

"R," "N," "D," sport mode "5", "4," "3," "2," or "1"),
and display it on the combination meter.

COMMENT

Connector(s), wiring harness in the CAN bus line
between the A/T-ECU and the combination meter,
power supply to the A/T-ECU, the combination
meter, the A/T-ECU may be defective.

TROUBLESHOOTING HINTS (The most
likely causes for this condition:)

• Malfunction of the combination meter

• Damaged harness, connector

• Malfunction of the A/T-ECU

Circuit drawings

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• Refer to component locations GROUP-

DIAGNOSIS

Required Special Tool:

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: 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.
Use diagnostic tool MB991958 to diagnose the CAN bus lines.
(1) Connect diagnostic tool MB991958 to the data link

connector.

(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 check result properly?

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

Diagnosis-CAN Bus Diagnostic Chart

P.54C-15

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

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STEP 2. Using diagnostic tool MB991958, read the MPI
diagnostic trouble code.
(1) Connect diagnostic tool MB991958 to the data link

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Check for MPI diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC (U1108) set?

YES : Retry the troubleshooting procedures.
NO : Replace the A/T-ECU.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

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DATA LIST REFERENCE TABLE

M1231008100337

MUT-III
DIAGNOSTI
C TOOL
DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION
REQUIREMENT

NORMAL
CONDITION

2ND SOL
DUTY

Second solenoid
valve duty %