Mitsubishi Galant (2004+). Manual — part 189
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-47
(4) Measure the terminal voltage between special tool 23-pin
connector (without red tape) terminal 33 (PCM connector
B-20 terminal 33) and ground.
• When the brake pedal is depressed, the voltage should
measure battery positive voltage (approximately 12
volts).
• When the brake pedal is released, the voltage should
measure 1 volt or less.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Disconnect special tool MB991923 between the PCM and
the body-side harness connector.
(7) Reconnect all the connectors to the PCM.
Q: Is the measured voltage battery positive voltage
(approximately 12 volts) when the brake pedal is
depressed and 1 volt or less when the brake pedal is
released?
YES : Go to Step 20 .
NO : Go to Step 16 .
STEP 16. Check the stoplight switch.
(1) Remove the stoplight switch (Refer to GROUP 35A, Brake
Pedal
(2) Connect an ohmmeter to the stoplight switch between
terminals 3 and 4.
(3) Check for continuity between the terminals when the
plunger of the stoplight switch is pushed in and when it is
released.
(4) The stoplight switch is operating properly if the circuit is
open between terminals 3 and 4 when the plunger is
released, and if resistance value is less than 2 ohms
between terminals 3 and 4 when the plunger is pushed in to
a depth of within 4.5 mm (0.18 inch) from the outer case
edge surface.
Q: Is the stoplight switch operating properly?
YES : Install the stoplight switch (Refer to GROUP 35A,
Brake Pedal
NO : Replace the stoplight switch (Refer to GROUP 35A,
Brake Pedal
AC209671AB
SPECIAL TOOL 23-PIN
CONNECTOR
(WITHOUT RED TAPE):
COMPONENT SIDE
1
2
3
4
ACX01917AJ
C-30 STOPLIGHT SWITCH
CONNECTOR
AC205057
CONTINUITY
NO
CONTINUITY
4.5 mm (0.18 in)
AC
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-48
STEP 17. Check PCM connector B-20 and stoplight switch
connector C-30 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 18 .
NO : Repair or replace the damaged components (Refer to
GROUP 00E, Harness Connector Inspection
AC305710
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AD
B-20
CONNECTOR: B-20
AIR CLEANER
PCM
AC305231AO
CONNECTOR: C-30
C-30
C-30 HARNESS
CONNECTOR:
COMPONENT SIDE
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-49
STEP 18. Check the harness wire between PCM connector
B-20 terminal 33 and stoplight switch connector C-30
terminal 3 for damage.
Q: Is the harness wire in good condition?
YES : Go to Step 19 .
NO : Repair the damaged harness wire. Then go to Step
22 .
AC305710
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AD
B-20
CONNECTOR: B-20
AIR CLEANER
PCM
AC305231AO
CONNECTOR: C-30
C-30
C-30 HARNESS
CONNECTOR:
COMPONENT SIDE
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-50
STEP 19. Check the harness wire between stoplight switch
connector C-30 terminal 4 and ground for damage.
Q: Is the harness wire in good condition?
YES : Go to Step 20 .
NO : Repair the damaged harness wire. Then go to Step
22 .
STEP 20. Using scan tool MB991958, check data list item
06: Brake 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 data reading mode.
• Auto-cruise control system item 06, Brake Switch.
• When the brake pedal is depressed, the display on
scan tool MB991958 should be "ON".
• When the brake pedal is released, the display on
scan tool MB991958 should be "OFF".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 21 .
NO : Replace the PCM [Refer to GROUP 13A, Power
Control Module (PCM)
]. Then go to Step
22 .
AC305231AO
CONNECTOR: C-30
C-30
C-30 HARNESS
CONNECTOR:
COMPONENT SIDE
AC305032
PCM
GROUND
TERMINAL
AC
RELAY BOX
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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