Mitsubishi Galant (2004+). Manual - part 692

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-319

CIRCUIT OPERATION
If the select switch of the shift switch assembly is set
to the sport mode, battery positive voltage will be
applied to the PCM (terminal 39). If the shift switch of
the shift switch assembly is set to "UP" or "DOWN"
position, battery positive voltage will be applied to the
PCM (terminal 32, 36).

COMMENT
When sport mode shift does not operate the cause is
probably a malfunction of the transmission range
switch circuit, shift switch assembly circuit or a defec-
tive PCM.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

• Malfunction of the transmission range switch

• Malfunction of the shift switch assembly select

switch

• Malfunction of the shift switch assembly shift

switch (Up)

• Malfunction of the shift switch assembly shift

switch (Down)

• Damaged harness or connector

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

AC207134

C-214

C-215

CONNECTORS: C-214, 215

3 4

C-214

C-215

1314

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-320

STEP 1. Using scan tool MB991958, read the A/T
diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 27 or 28 set?

YES <DTC 27 set> : Refer to

P.23A-121

, DTC 27:

Transmission Range Switch System (Open Circuit).

YES <DTC 28 set> : Refer to

P.23A-166

, DTC 28:

Transmission Range Switch System (Short Circuit).

NO : Go to Step 2.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-321

STEP 2. Using scan tool MB991958, check data list item 67:
Select Switch, item 68: Shift Switch (Up), item 69: Shift
Switch (Down).

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for

following items.

a. Item 67: Select Switch
b. Item 68: Shift Switch (Up)

c. Item 69: Shift Switch (Down)

NOTE: The switches above are displayed, depending on
the selector lever condition as shown in the table.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-6

NO <If completely NG> : Go to Step 3.
NO <If item 68 and item 69 both are NG> : Go to Step 5.
NO <If only item 67 is NG> : Go to Step 9.
NO <If only item 68 is NG> : Go to Step 17.
NO <If only item 69 is NG> : Go to Step 22.

SELECTOR LEVER
OPERATION

DATA LIST ITEM

D range

OFF

Sport mode

OFF

Upshift and hold the selector
lever

OFF

Downshift and hold the
selector lever

OFF

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-322

STEP 3. Check PCM connector B-20 and shift switch
assembly connector C-20 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

Q: Are the connectors in good condition?

YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

AC306248AH

CONNECTOR: B-20

PCM

AIR
CLEANER

JAE

21 22

B-20

AC306349AB

CONNECTOR: C-20

5 6

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