Mitsubishi Galant 9G. Manual — part 509
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-114
STEP 4. Measure the stoplight switch power supply
voltage at connector C-30 by backprobing.
(1) Remove the stoplight switch from the mounting bracket.
(2) Do not disconnect connector C-30.
(3) Measure the voltage between terminal 2 and ground by
backprobing.
• The voltage should measure battery positive voltage.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 7.
NO : Go to step 5.
STEP 5. Check stoplight switch connector C-30 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 6. Check the harness for damage between stoplight
switch connector C-30 terminal 2 and the power supply
fuse.
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair or replace the harness wire.
AC305231
CONNECTOR: C-30
AU
2
1
3
4
2
1
3
4
AC201487
C-30 HARNESS
CONNECTOR:
HARNESS SIDE
AG
AC305231
CONNECTOR: C-30
AU
2
1
3
4
AC305231
CONNECTOR: C-30
AU
2
1
3
4
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-115
STEP 7. Measure the stoplight switch output voltage to the
PCM at connector C-30 by backprobing.
(1) Remove the stoplight switch from the mounting bracket.
(2) Do not disconnect connector C-30.
(3) Measure the voltage between terminal 1 and ground by
backprobing.
• When the switch button is out (closed circuit), voltage
should equal battery positive voltage.
• When the switch button is depressed (open circuit), volt-
age should measure less than 1.0 volt.
Q: Is the measured voltage battery positive voltage with
the switch button released (closed circuit), and less
than 1.0 volt with the switch button depressed (open
circuit)?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check the stoplight switch.
Refer to GROUP 35A, On-vehicle Service
− Stoplight Switch
.
Q: Does the stoplight switch pass the checks?
YES : Go to Step 9.
NO : Replace the stoplight switch. Refer to GROUP 35A,
.
AC305231
CONNECTOR: C-30
AU
2
1
3
4
3
2
1
4
AC201041
C-30 HARNESS
CONNECTOR:
HARNESS SIDE
AH
ACX02208
BRAKE PEDAL
STOPLIGHT
SWITCH
AD
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-116
STEP 9. Measure the stoplight switch output voltage at the
PCM connector B-19 by using check harness special tool
MB991923.
(1) Install the stoplight switch into the mounting bracket if it was
removed.
(2) Disconnect all the connectors from the PCM.
(3) Connect special tool MB991923 (check harness) between
the PCM and the body-side harness connector.
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
AC209793AI
PCM
MB991923
BODY SIDE
HARNESS
SPECIAL TOOL 18-PIN CONNECTOR
(PCM CONNECTOR B-19)
B-19 (B)
4 3 2 1
7 6 5
8 9
11 10
14 13 12
18 17 16 15
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-117
(4) Measure the voltage between terminal 9 and ground.
• When the brake pedal is depressed, voltage should
measure battery positive voltage.
• When the brake pedal is not depressed, voltage should
measure less than 1.0 volt.
Q: Is the measured voltage battery positive voltage with
the brake pedal depressed (closed circuit), and less
than 1.0 volt with the brake pedal released (open
circuit)?
YES : Go to Step 12.
NO : Go to Step 10.
STEP10. Check PCM connector B-19 and joint connector
(1) C-01 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 11.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC210383
3
17
10
13
18
4
11
14
7
1615
1
2
5
12
9
6
8
JAE
B-19 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
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
CONNECTOR: C-01
AS
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
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