Mitsubishi Galant 9G. Manual — part 560
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-318
.
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
AC207134
C-214
C-215
CONNECTORS: C-214, 215
AO
1
3 4
2
6
5
C-214
C-215
6
1
7
2
9
8
10
3
5
12
11
4
1314
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-319
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
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?
, DTC 27:
Transmission Range Switch System (Open Circuit).
, DTC 28:
Transmission Range Switch System (Short Circuit).
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-320
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
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
67
68
69
D range
OFF
OFF
OFF
Sport mode
ON
OFF
OFF
Upshift and hold the selector
lever
ON
ON
OFF
Downshift and hold the
selector lever
ON
OFF
ON
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-321
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
AC306248AH
CONNECTOR: B-20
PCM
AIR
CLEANER
JAE
41
37
32
40
39
23
21 22
35
31
30
26
36
27
43
42
25
24
38
34
29
33
28
B-20
AC306349AB
CONNECTOR: C-20
4
3
1
5 6
2
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