Mitsubishi Galant (2004+). Manual - part 188

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-43

STEP 10. Check the stoplight switch.

(1) Remove the stoplight switch (Refer to GROUP 35A, Brake 

Pedal 

P.35A-24

).

(2) Connect an ohmmeter to the stoplight switch between 

terminals 1 and 2.

(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 1 and 2 when the plunger is 
pushed in to a depth of within 4.0 mm (0.16 inch) from the 
outer case edge surface, and if the resistance value is less 
than 2 ohms between terminals 1 and 2 when it is released.

Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch (Refer to GROUP 35A, 

Brake Pedal 

P.35A-24

). Then go to Step 11 .

NO :  Replace the stoplight switch (Refer to GROUP 35A, 

Brake Pedal 

P.35A-24

). Then go to Step 22 .

STEP 11. Check stoplight switch connector C-30 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 12 .
NO :  Repair or replace the damaged components (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). Then go to Step 22 .

ACX02256 AL

C-30 STOPLIGHT SWITCH
CONNECTOR

AC205057    

CONTINUITY

NO
CONTINUITY

4.0 mm (0.16 in)

AB

AC305232AD

CONNECTORS: C-01, C-30

C-30 HARNESS
CONNECTOR:
COMPONENT SIDE

C-30

C-01

C-01 HARNESS
CONNECTOR:
CONPONENT SIDE

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-44

STEP 12. Check the harness wire between stoplight switch 
connector C-30 terminal 1 and joint connector (1) C-01 
terminal 12 for damage.

Q: Is the harness wire in good condition?

YES : Go to Step 13 .
NO :  Repair the damaged harness wire. Then go to Step 

22 .

STEP 13. Using scan tool MB991958, check data list item 
05: 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. 

(Refer to 

P.17-12

).

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

• Auto-cruise control system item 05, Stoplight 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) 

P.13A-1121

]. Then go to Step 

22 .

AC305232AD

CONNECTORS: C-01, C-30

C-30 HARNESS
CONNECTOR:
COMPONENT SIDE

C-30

C-01

C-01 HARNESS
CONNECTOR:
CONPONENT SIDE

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-45

STEP 14. 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 

P.17-12

.

(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 :  Go to Step 15 .

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 15. Measure the terminal voltage at PCM connector 
B-20.

(1) Disconnect all the connectors from the PCM.

(2) Connect special tool MB991923 between the PCM and the 

body-side harness connector.

(3) Turn the ignition switch to the "ON" position.

AC305710

B-20 HARNESS

CONNECTOR:

COMPONENT SIDE

AD

B-20

CONNECTOR: B-20

AIR CLEANER

PCM

AC209793AL

SPECIAL TOOL 23-PIN CONNECTOR
WITHOUT RED TAPE
(PCM CONNECTOR B-20)

B-20

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

PCM

MB991923

BODY SIDE
HARNESS