Mitsubishi Galant. Manual — part 419

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-143

STEP 33. Check the switch output voltage at PCM
connector C-42 by backprobing.
(1) Do not disconnect connector C-42.
(2) Turn the ignition switch to "ON" position.
(3) Move the selector lever to "L" position.

(4) Measure the voltage between terminal 110 and ground by

backprobing.

•

Voltage should be battery positive voltage.

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

Q: Is the voltage normal?

YES : Go to Step 10.
NO : Go to Step 34.

STEP 34. Check connector C-42 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair it because of the harness open circuit or short

circuit to ground between the Park/Neutral position
switch connector B-39 terminal 6 and PCM connector
C-42 terminal 110.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

DTC 28: Park/Neutral Position Switch System (Short Circuit)

Park/Neutral Position Switch System Circuit
Refer to

P.23A-124

.

CIRCUIT OPERATION
Refer to

P.23A-124

.

DTC SET CONDITIONS
If the PCM detects more than one kind of park/
neutral position switch input signals for continuous
period of thirty seconds, it is judged that there is a
short circuit in the Park/Neutral position switch and
diagnostic trouble code number "28" is output.

TROUBLESHOOTING HINTS (The most likely

causes for this code to be set:)

•

Malfunction of the Park/Neutral position switch

•

Malfunction of the ignition switch

•

Damaged harness, connector

•

Malfunction of the PCM

AC004197

PCM

AF

CONNECTOR: C-42

AC001946

C-42 CONNECTOR
HARNESS SIDE VIEW

AE

AC004197

PCM

AF

CONNECTOR: C-42

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-144

DIAGNOSIS

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

STEP 1. Check the Park/Neutral position switch.

Check for continuity between terminals for each selector
position.

Q: Is the switch operating properly?

YES : Go to Step 2.
NO : Replace the Park/Neutral position switch. Refer to

GROUP 23B, Transaxle

P.23B-10

.

STEP 2. Check connector B-39 at the Park/Neutral position
switch for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

ITEMS

TERMINAL CONNECTION
OF TESTER

SPECIFIED
CONDITION

P

3

−

8, 9

−

10

Less than 2 ohm.

R

7

−

8

N

4

−

8, 9

−

10

D

1

−

8

3

5

−

8

2

2

−

8

L

6

−

8

AC004672

DIPSTICK

PARK/NEUTRAL
POSITION (PNP)
SWITCH

AC

AC001846

P

R

N

D

3

2

L

AB

AC001844AI

CONNECTOR: B-39

DIPSTICK

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-145

STEP 3. Check connector C-42 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. Check the switch output voltage at PCM
connector C-42 by backprobing. ("P" position)
(1) Do not disconnect connector C-42.
(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 101 and ground by

backprobing.

•

When selector lever position is "P," voltage should be
battery positive voltage.

•

When selector lever position is "R," voltage should be
0.5 volt or less.

•

When selector lever position is "N," voltage should be
0.5 volt or less.

•

When selector lever position is "D," voltage should be
0.5 volt or less.

•

When selector lever position is "3," voltage should be
0.5 volt or less.

•

When selector lever position is "2," voltage should be
0.5 volt or less.

•

When selector lever position is "L," voltage should be
0.5 volt or less.

Q: Is the voltage normal?

YES : Go to Step 5.
NO : Turn the ignition switch to "LOCK" (OFF) position.

Repair it because of the harness damage between
the Park/Neutral position switch connector B-39
terminal 3 and PCM connector C-42 terminal 101.

AC004197

PCM

AF

CONNECTOR: C-42

AC004197

PCM

AF

CONNECTOR: C-42

AC001903

C-42 CONNECTOR
HARNESS SIDE VIEW

AE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-146

STEP 5. Check the switch output voltage at PCM
connector C-42 by backprobing. ("R" position)
Measure the voltage between terminal 108 and ground by
backprobing.

•

When selector lever position is "P," voltage should be 0.5
volt or less.

•

When selector lever position is "R," voltage should be
battery positive voltage.

•

When selector lever position is "N," voltage should be 0.5
volt or less.

•

When selector lever position is "D," voltage should be 0.5
volt or less.

•

When selector lever position is "3," voltage should be 0.5
volt or less.

•

When selector lever position is "2," voltage should be 0.5
volt or less.

•

When selector lever position is "L," voltage should be 0.5
volt or less.

Q: Is the voltage normal?

YES : Go to Step 6.
NO : Turn the ignition switch to "LOCK" (OFF) position.

Repair it because of the harness damage between
the Park/Neutral position switch connector B-39
terminal 7 and PCM connector C-42 terminal 108.

STEP 6. Check the switch output voltage at PCM
connector C-42 by backprobing. ("N" position)
Measure the voltage between terminal 121 and ground by
backprobing.

•

When selector lever position is "P," voltage should be 0.5
volt or less.

•

When selector lever position is "R," voltage should be 0.5
volt or less.

•

When selector lever position is "N," voltage should be
battery positive voltage.

•

When selector lever position is "D," voltage should be 0.5
volt or less.

•

When selector lever position is "3," voltage should be 0.5
volt or less.

•

When selector lever position is "2," voltage should be 0.5
volt or less.

•

When selector lever position is "L," voltage should be 0.5
volt or less.

Q: Is the voltage normal?

YES : Go to Step 7.
NO : Turn the ignition switch to "LOCK" (OFF) position.

Repair it because of the harness damage between
the Park/Neutral position switch connector B-39
terminal 4 and PCM connector C-42 terminal 121.

AC001904

C-42 CONNECTOR
HARNESS SIDE VIEW

AE

AC001905

C-42 CONNECTOR
HARNESS SIDE VIEW

AE