Mitsubishi 380. Manual — part 428

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-252

INSPECTION PROCEDURE 15: Sports Mode Switch System

.

CIRCUIT OPERATION

If the select switch of the shift switch assembly is set
to the sport mode, battery positive voltage will be
applied to the A/T-ECU connector B-19 (terminal 17).
If the shift switch of the shift switch assembly is set to
"UP" or "DOWN" position, battery positive voltage
will be applied to the A/T-ECU connector B-19 (termi-
nals 8 and 9).

AC306223

A-13 (GR)

AB

CONNECTOR: A-13

1

4

7

8

2 3

5

13 14

17

15

12

16

11

10

9

6

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS: B-19, B-22

AC210068

CONNECTOR: B-110

B-110 (B)

AE

TRANSMISSION
RANGE SWITCH

1

7

2

8

3

5

9

4

10

6

10DB093A

CONNECTOR: D-14

FLOOR

WIRING

HARNESS

4

Y

2

15

ROOF

WIRING

HARNESS

D-14

10DB084A

CONNECTORS: C-214, 215

1
3 4

2
6

5

C-214

C-215

6

1
7

2

9

8

10

3

5

12

11

4

1314

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-253

.

COMMENT

When sport mode shift does not operate the cause is
probably a malfunction of the transmission inhibitor
switch circuit, shift switch assembly circuit or a defec-
tive A/T-ECU.

.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the transmission inhibitor switch

• Malfunction of the shift switch assembly select

switch

• Malfunction of the shift switch assembly shift

switch (Up)

• Malfunction of the shift switch assembly shift

switch (Down)

• Damaged harness or connector

• Malfunction of the A/T-ECU system

Circuit drawings

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Refer to component locations GROUP-

70

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, read the A/T
diagnostic trouble code.

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 to the data link

connector.

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

Q: Is (P0705) set?

YES <(P0705)> : Refer to

P.23A-97

: Transmission Inhibitor

Switch System (Open Circuit) or refer to

P.23A-119

:

Transmission Inhibitor Switch System (Short Circuit).

NO : Go to Step 2.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-254

STEP 2. Using diagnostic tool MB991958, check data list
item 27: Select Switch, item 28: Shift Switch (Up), item 29:
Shift Switch (Down).
(1) Connect diagnostic tool MB991958 to the data link

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Set diagnostic tool MB991958 to the data reading mode for

following items.

a. Item 27: Select Switch
b. Item 28: Shift Switch (Up)

c. Item 29: Shift Switch (Down)

NOTE: The switches above are displayed, depending on
the selector lever condition as shown in the table.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

.

NO <If completely NG> : Go to Step 3.
NO <If item 28 and item 29 both are NG> : Go to Step 5.
NO <If only item 27 is NG> : Go to Step 9.
NO <If only item 28 is NG> : Go to Step 17.
NO <If only item 29 is NG> : Go to Step 22.

SELECTOR LEVER
OPERATION

DATA LIST ITEM

27

28

29

D range

OFF

OFF

OFF

Sport mode

ON

OFF

OFF

Upshift and hold the selector
lever

ON

ON

OFF

Downshift and hold the
selector lever

ON

OFF

ON

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-255

STEP 3. Check A/T-ECU connector B-19 and shift switch
assembly connector D-14 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors 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

4

Y

2

15

ROOF

WIRING

HARNESS

D-14