Mitsubishi Galant. Manual — part 413

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-119

•

Damaged harness, connector

•

Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Check the brake pedal height.
Refer to GROUP 35A, On-vehicle Service

−

Brake Pedal

Check and Adjustment

P.35A-17

.

Q: Is the height adjusted properly?

YES : Go to Step 2.
NO : Adjust it.

STEP 2. Using scan tool MB991502, check data list item 26:
Stoplight Switch.

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) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 26,

Stoplight Switch.

•

When the brake pedal is depressed, the display should
be "ON."

•

When the brake pedal is not depressed, the display
should be "OFF."

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

Q: Is the switch 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 3.

STEP 3. Check the stoplight switch as single part.
Refer to GROUP 35A, On-vehicle Service

−

Stoplight Switch

Check

P.35A-18

.

Q: Is the switch normal?

YES : Go to Step 4.
NO : Replace the stoplight switch.Refer to GROUP 35A,

Brake Pedal

P.35A-30

.

AC003081AC

MB991502

DATA LINK
CONNECTOR

ACX02208

BRAKE PEDAL

STOPLIGHT
SWITCH

AD

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-120

STEP 4. Check connector C-03 at stoplight switch for
damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 5. Check the switch output voltage at PCM
connector C-42 by backprobing.
(1) Do not disconnect connector C-42.

(2) Measure the voltage between terminal 123 and ground by

backprobing.

•

When the brake pedal is depressed, voltage should be
battery positive voltage.

•

When the brake pedal is not depressed, voltage should
be less than 1.0 volt.

Q: Is the voltage normal?

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

AC004287

CONNECTOR: C-03

AC

AC004197

PCM

AF

CONNECTOR: C-42

AC001812

C-42 CONNECTOR
HARNESS SIDE VIEW

AE

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-121

STEP 6. Check connectors C-42 at PCM, C-57 at joint
connector and C-66, C-17 at intermediate connector 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

AC004287

CONNECTOR: C-57

AD

AC004344

CONNECTOR: C-66

CONNECTOR
BLOCK (LH)

C-66

AB

AC004308AB

CONNECTOR: C-17

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-122

STEP 7. Check harness for damage between stoplight
switch connector C-03 terminal 1 and PCM connector C-42
terminal 123.
Q: Is the harness wire in good condition?

YES : Repair it because of the connector and the harness

damage between output signal line of the stoplight
switch.

NO : Repair it.

STEP 8. Check connector C-42 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

AC004287

CONNECTOR: C-03

AC

AC004197

PCM

AF

CONNECTOR: C-42

AC004197

PCM

AF

CONNECTOR: C-42