Mitsubishi Montero (2004+). Manual - part 405

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-27

DTC 22: Stoplight Switch System

AC204904AB

Stoplight Switch System Circuit

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-28

AC205041

CONNECTORS: D-28, D-29

D-28

D-29

AB

D-28

D-29

AC205042

CONNECTOR: D-116

D-116

AB

1

2

3

4

AC204682AB

CONNECTOR: D-123

D-123 

AC205043

CONNECTOR: D-125

D-125 

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-29

.

CIRCUIT OPERATION

• Battery positive voltage is supplied to the stop-

light switch (terminal 2 and 3).

• When the brake pedal is depressed, battery posi-

tive voltage is applied to the PCM (terminal 39 
and 54).

.

DTC SET CONDITIONS

Check Condition

• The auto-cruise control indicator light illuminates.

Judgement Criteria

• Short in stop light switch circuit

• Open circuit in the brake switch circuit (between 

PCM terminal 54 and ground)

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Malfunction of the stoplight switch.

• Damaged harness or connector.

• Malfunction of the PCM.

DIAGNOSIS

.

Required Special Tools:

• MB991958: Scan tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

• MB991223: Harness set

STEP 1. Check the brake pedal height.
Refer to GROUP 35A, On-vehicle Service 

− Brake Pedal 

Check and Adjustment 

P.35A-117

.

Q: Is the height adjusted properly?

YES : Go to Step 2.
NO :  Adjust the brake pedal to the proper height.

AC205046

CONNECTOR: D-133

D-133(GR)

PCM

AB

AC205044

6

1

7

2

9

8

10

3

5

12

11

4

1314

38

28

16

33

22

10

31

19

7

1

18

30

29

17

5

6

21

20

32

8

2

9

25

13

3

24

23

3435

1112

27

26

3637

14

4

15

CONNECTORS: E-110, E-111

E-111

E-110

E-111

E-110

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-30

STEP 2. Using scan tool MB991958, read the 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 system diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 26 set?

YES : Refer to GROP 23A, Diagnostic Trouble Code 

Procedures 

− DTC 26: Stoplight Switch System 

P.23A-111

.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, check data list item 06: 
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 data reading mode.

Item 06 auto-cruise control system, 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 is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

.

NO :  Go to Step 4.

AC306409AF

MB991911

MB991824

MB991827

AC306409AF

MB991911

MB991824

MB991827