Mitsubishi Galant 9G. Manual — part 508
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-110
STEP 19. Using scan tool MB991958, check data list item
23: Output Shaft Speed Sensor.
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) Start the engine.
(3) Set scan tool MB991958 to data reading mode.
• Item 23: Output Shaft Speed Sensor.
• When driving at constant speed of 50 km/h (31
mph), the display should be "1,400
− 1,700 r/min"
(Gear range: 3rd gear).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor 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 : Replace the PCM.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-111
DTC 26: Stoplight Switch System
BATTERY
RELAY
BOX
STOPLIGHT
SWITCH
JOINT
CONNECTOR (1)
POWERTRAIN
CONTROL MODULE
AC209757AC
Stoplight Switch System Circuit
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-112
.
CIRCUIT OPERATION
• Battery positive voltage is supplied to the stop-
light switch (terminal 2).
• When the brake pedal is depressed, battery posi-
tive voltage is applied to the PCM (terminal 9).
.
DTC SET CONDITIONS
If the stoplight switch is on for five minutes or more
while driving above 50 km/h (31 mph), or all of the
stop light bulbs are blown, it is judged there is a short
circuit or open circuit in the stoplight switch. This
causes DTC 26 to be set.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Malfunction of the stoplight switch
• Malfunction of stoplight valve
• 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
STEP 1. Check the brake pedal height.
Refer to GROUP 35A, On-vehicle Service
− Brake Pedal
Q: Is the height adjusted properly?
YES : Go to Step 2.
NO : Adjust the brake pedal to the proper height.
AC306248AF
B-19
(B)
CONNECTOR: B-19
PCM
AIR
CLEANER
JAE
17
13
10
12
1516
5 6
9
2
14
18
11
4
7
3
8
1
AC305231
CONNECTORS: C-01, C-30
AT
C-01
2
1
3
4
C-30
C-30
33
22
11
28
17
16
15
14
13
12
25
2324
2627
3
1 2
4 5
21
20
19
18
29 30
32
31
7
6
8
10
9
C-01
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-113
STEP 2. Check the stoplight valve.
Refer to GROUP 54A, Rear combination light
Q: Is the stoplight valve in good condition?
YES : Go to Step 3.
NO : Replace the stoplight switch. Refer to GROUP 35A,
.
STEP 3. Using scan tool MB991958, check data list item 26:
Stoplight Switch.
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) Set scan tool MB991958 to the data reading mode.
• Item 26: Stoplight Switch.
• When the brake pedal is depressed, the display on
scan tool MB991958 should be "ON."
• When the brake pedal is not depressed, the display
on scan tool MB991958 should be "OFF."
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : It can be assumed that this malfunction may be
intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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