Mitsubishi Galant. Manual — part 414

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-123

STEP 9. 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 : Replace the PCM.

AC003081AC

MB991502

DATA LINK
CONNECTOR

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-124

DTC 27: Park/Neutral Position Switch System (Open Circuit)

AC004616AB

Park/Neutral Positon Switch System Circuit

AC001844AI

CONNECTOR: B-39

DIPSTICK

AC004308AB

CONNECTOR: C-17

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-125

CIRCUIT OPERATION

•

Battery positive voltage is applied to the Park/
Neutral position switch (terminal 8) when the
ignition switch is turned "ON."

•

Battery positive voltage is applied to the PCM
(terminal 101) when the selector lever is in the
"P" range. The PCM judges that the selector
lever is in the "P" range when the battery positive
voltage is applied.

•

Battery positive voltage is applied to the PCM
[terminals 108, 121, 102, 109, 122 or 110] when
the selector lever is in the "R" range ("N," "D," "3,"
"2" or "L" range). The PCM judges that the
selector lever is in the "R" range ("N," "D," "3," "2"
or "L" range) when the battery positive voltage is
applied.

DTC SET CONDITIONS
If the PCM detects no Park/Neutral position switch
input signal from any selector position for continuous
period of thirty seconds, it is judged that there is an
open circuit in the Park/Neutral position switch and
diagnostic trouble code number "27" 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

DIAGNOSIS

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

AC004197

PCM

AF

CONNECTOR: C-42

AC004307

CONNECTORS: C-73, C-77

C-73

JUNCTION BLOCK
(FRONT VIEW)

C-77

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-126

STEP 1. Using scan tool MB991502, check data list item 61:
Park/Neutral Position 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 61:

Park/Neutral Position Switch.

•

Move the selector lever to "P," "R," "N," "D," "3," "2," "L"
positions to confirm whether the MUT-II.

(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 : When indication disagrees at all positions: Go to Step

2. When indication disagrees at "P" position: Go to
Step 6. When indication disagrees at "R" position: Go
to Step 11. When indication disagrees at "N" position:
Go to Step 15. When indication disagrees at "D"
position: Go to Step 19. When indication disagrees at
"3" position: Go to Step 23 . When indication
disagrees at "2" position: Go to Step 27. When
indication disagrees at "L" position: Go to Step 31.

AC003081AC

MB991502

DATA LINK
CONNECTOR