Mitsubishi Lancer Evolution X. Manual - part 110

CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-27

DTC 22: Stoplight Switch System

AC804869AB

Stoplight Switch System Circuit <M/T>

CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-28

AC804870 AB

Stoplight Switch System Circuit <TC-SST>

CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-29

.

CIRCUIT OPERATION

• For the stoplight switch, two switches, a stoplight 

switch for the stoplight illumination and a brake 
switch exclusively for the cruise control system, 
are incorporated to improve the reliability.

• As for the stoplight switch, when the brake pedal 

is depressed/released, the stoplight switch 
ON/OFF signal is transmitted from the 
ETACS-ECU to the ECM via CAN bus line.

• As for the brake switch, the ECM connector B-10 

terminal number 108 monitor the state of the 
brake switch. The brake switch turn ON/OFF 
when the brake pedal is depressed/released, and 
the input signal to the ECM connector B-10 termi-
nal number 108 changes. According to this 
change, the ECM judges the state of the brake 
switch.

.

DTC SET CONDITIONS

Check Condition

• The "CRUISE" indicator light illuminates.

Judgment Criteria

• Open/short in stoplight switch circuit.
• Open circuit in the brake switch circuit (between 

ECM connector B-10 terminal number 108 and 
body ground.)

• Malfunction of CAN bus line.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of CAN bus system.
• Damaged harness or connector.
• Malfunction of the stoplight switch.
• Malfunction of the ETACS-ECU
• Malfunction of the ECM

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

• MB991223: Harness Set
• MB992006: Extra Fine Probe

AC709196 AB

B-10 (GR)

Connector: B-10

ECM

Air cleaner

AC709197

Connector: C-48

AC

AC708835AC

ETACS-ECU

Connectors: C-304, C-309, C-312

C-309 (B)

C-304

C-312

CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-30

CAUTION

If there is any problem in the CAN bus lines, an incorrect 
diagnostic trouble code (DTC) may be set. Prior to this 
diagnosis, diagnose the CAN bus lines (Refer to GROUP 
54C, Trouble code diagnosis 

P.54C-9

.)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

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.17-10

.)

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line (Refer to 

P.17-10

.)

Q: Is the check result satisfactory?

YES : Go to Step 2
NO :  Repair the CAN bus lines (Refer to GROUP 54C, 

Diagnosis − Can Bus Diagnostic Chart 

P.54C-15

.) 

Then go to Step 16.

STEP 2. Using scan tool MB991958, check data list item 74: 
Brake light switch.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.17-10

.)

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

control system (Refer to 

P.17-10

.)

• Item 74: Brake light 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".

Q: Is the switch operating properly?

YES : Go to Step 10.
NO :  Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB