Mitsubishi Galant. Manual — part 410

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-107

STEP 1. Using scan tool MB991502, check data list item 23:
Output Shaft Speed Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to data reading mode for item 23:

Output Shaft Speed Sensor.

•

When driving at constant speed of 50km/h (31mph), the
display should be "1,600

−

1,900 r/min." <2.4L Engine>,

"1,300

−

1,600 r/min." <3.0L Engine> (Gear range: 3rd

gear)

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

Q: Is the sensor operating properly?

YES : This malfunction is intermittent. Refer to GROUP 00,

How to Use Troubleshooting/Inspection Service
Points

−

How to Cope with Intermittent Malfunction

P.00-8

.

NO : Go to Step 2.

STEP 2. Check the ground voltage at PCM connector C-40
by backprobing.
(1) Do not disconnect connector C-40.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 57 and ground by

backprobing.

•

Voltage should be 0.5 volt or less.

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

Q: Is the voltage normal?

YES : Go to Step 5.
NO : Go to Step 3.

AC003081AC

MB991502

DATA LINK
CONNECTOR

AC004197

PCM

AD

CONNECTOR: C-40

AC001791

C-40 CONNECTOR
HARNESS SIDE VIEW

AE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-108

STEP 3. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 4. Using scan tool MB991502, check data list item 23:
Output Shaft Speed Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to the data reading mode for item

23, Output Shaft Speed Sensor.

•

When driving at constant speed of 50km/h (31mph), the
display should be "1,600

−

1,900 r/min." <2.4L Engine>,

"1,300

−

1,600 r/min." <3.0L Engine> (Gear range: 3rd

gear)

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

Q: Is the sensor operating properly?

YES : This malfunction is intermittent. Refer to GROUP 00,

How to Use Troubleshooting/Inspection Service
Points

−

How to Cope with Intermittent Malfunction

P.00-8

.

NO : Replace the PCM.

AC004197

PCM

AD

CONNECTOR: C-40

AC003081AC

MB991502

DATA LINK
CONNECTOR

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-109

STEP 5. Check the sensor output voltage at PCM
connector C-42 by backprobing.
(1) Do not disconnect connector C-42.
(2) Disconnect connector B-37 at the output shaft speed

sensor.

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

(4) Measure the voltage between terminal 104 and ground by

backprobing.

•

Voltage should be between 4.8 and 5.2 volts.

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

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Go to Step 6.

STEP 6. Check connectors C-42 at PCM and B-37 at output
shaft speed sensor for damage.
Q: Are the connectors in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

AC004197

PCM

AF

CONNECTOR: C-42

AC001811

C-42 CONNECTOR
HARNESS SIDE VIEW

AE

AC004197

PCM

AF

CONNECTOR: C-42

AC001837AG

CONNECTOR: B-37

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-110

STEP 7. Check harness for short circuit to ground between
PCM connector C-42 terminal 104 and output shaft speed
sensor connector B-37 terminal 2.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair it.

AC004197

PCM

AF

CONNECTOR: C-42

AC001837AG

CONNECTOR: B-37