Mitsubishi 380. Manual — part 381

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-64

STEP 10. Check the harness for short circuit to ground
between A/T-ECU connector B-22 terminal 5 and input
shaft speed sensor connector B-109 terminal 2.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair or replace the harness wire.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS: B-19, B-22

AC305354

TRANSMISSION
RANGE SWITCH

B-109 (GR)

AC

CONNECTOR: B-109

1

3

2

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-65

STEP 11. Measure the ground circuit for resistance at the
input shaft speed sensor connector B-109.
(1) Disconnect connector B-109 from the speed sensor and

measure at the harness side.

(2) Measure the resistance between terminal 1 and ground.

• The resistance should measure less than 2 ohms.

Q: Is the measured resistance less than 2 ohms?

YES : Go to Step 16.
NO : Go to Step 12.

AC305354

TRANSMISSION
RANGE SWITCH

B-109 (GR)

AC

CONNECTOR: B-109

1

3

2

3

1

2

AC210632

B-109 HARNESS
CONNECTOR:
COMPONENT SIDE

AD

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-66

STEP 12. Measure the resistance at the A/T-ECU connector
B-22 by using check harness special tool.
(1) Disconnect all the connectors from the A/T-ECU.

(2) Connect special tool MB992045 (check harness) between

the A/T-ECU and the body-side harness connector.

(3) Turn the ignition switch to the "ON" position.

(4) Measure the resistance between terminal 12 and ground.

• The resistance should measure less than 2 ohms.

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

Q: Is the measured resistance less than 2 ohms?

YES : Go to Step 13.
NO : Go to Step 15.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS: B-19, B-22

10DB161A

A/T-ECU CHECK HARNESS
MB992045

A/T-ECU

A/T-ECU CHECK
HARNESS
CONNECTORS

10DB086A

B-22 CONNECTOR:

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-67

STEP 13. Check A/T-ECU connector B-22 and input shaft
speed sensor connector B-109 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 14.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS: B-19, B-22

AC305354

TRANSMISSION
RANGE SWITCH

B-109 (GR)

AC

CONNECTOR: B-109

1

3

2