Mitsubishi 380. Manual - part 390

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-100

STEP 2. Check the transmission inhibitor switch.
Measure the resistance between the terminals for each trans-
mission range as indicated in the table below.

Q: Does the resistance measure less than 2 ohms for each 

transmission range?
YES : Go to Step 3.
NO :  Replace the transmission inhibitor switch. Refer to 

GROUP 23B, Transmission 

23B-13

.

TRANSMISSION 
RANGE

TERMINAL CONNECTION OF 
TESTER

SPECIFIED CONDITION

P

3 

− 8, 9 − 10

Less than 2 ohms.

R

7 

− 8

N

4 

− 8, 9 − 10

D

1 

− 8

AC305881

AC305532

AC305679

<F4A4B>

<F4A5A>

AC

TRANSMISSION
RANGE SWITCH

TRANSMISSION
RANGE SWITCH

AC210182AC

P

R

N

D

<F4A5A>

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-101

STEP 3. Check intermediate connector A-13, transmission 
inhibitor switch connector B-110 and junction block 
connector C-214 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are the connectors 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

.

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

AC210068

CONNECTOR: B-110

B-110 (B)

AE

TRANSMISSION
RANGE SWITCH

1

7

2

8

3

5

9

4

10

6

10DB085A

CONNECTOR: C-214

6

1
7

2

9

8

10

3

5

12

11

4

1314

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-102

STEP 4. Check harness for open or short circuit to ground 
between transmission inhibitor switch connector B-110 
terminal 8 and junction block connector C-214 terminal 12.
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair or replace the harness wire.

STEP 5. Using diagnostic tool MB991958, check data list 
item 34:Transmission Inhibitor Switch.

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 "ON" position.
(3) Set diagnostic tool MB991958 to the data reading mode.

• Item 34: Transmission Inhibitor Switch.

• Move the selector lever to "P," "R," "N," "D," and 

sport mode positions and confirm that the selected 
transmission range match the positions shown on 
diagnostic tool MB991958. (Sport mode is indicated 
as "D" on the diagnostic tool).

(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 :  Replace the A/T-ECU.

AC210068

CONNECTOR: B-110

B-110 (B)

AE

TRANSMISSION
RANGE SWITCH

1

7

2

8

3

5

9

4

10

6

10DB085A

CONNECTOR: C-214

6

1
7

2

9

8

10

3

5

12

11

4

1314

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-103

STEP 6. Check the transmission inhibitor switch.
Measure the resistance between the terminals for each trans-
mission range as indicated in the table below.

Q: Does the resistance measure less than 2 ohms for each 

transmission range?
YES : Go to Step 7.
NO :  Replace the transmission inhibitor switch. Refer to 

GROUP 23B, Transmission 

23B-13

.

STEP 7. Check transmission inhibitor switch connector 
B-110 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 8.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

TRANSMISSION 
RANGE

TERMINAL CONNECTION OF 
TESTER

SPECIFIED CONDITION

P

3 

− 8, 9 − 10

Less than 2 ohms.

R

7 

− 8

N

4 

− 8, 9 − 10

D

1 

− 8

AC305881

AC305532

AC305679

<F4A4B>

<F4A5A>

AC

TRANSMISSION
RANGE SWITCH

TRANSMISSION
RANGE SWITCH

AC210182AC

P

R

N

D

<F4A5A>

AC210068

CONNECTOR: B-110

B-110 (B)

AE

TRANSMISSION
RANGE SWITCH

1

7

2

8

3

5

9

4

10

6