Mitsubishi Evolution X. Manual — part 214

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-25

STEP 20. Read the DTC.
(1) Disconnect the negative (

−) battery terminal, to erase the

DTC of the cruise control system.

(2) Connect the negative (

−) battery cable.

(3) Turn the ignition switch to the "ON" position, and press the

"ON/OFF" switch to turn the cruise control system to ON
(turn on the "CRUISE" indicator light).

(4) After turning the cruise control system to ON, when 2

minutes or more has elapsed without operating the cruise
control switches, read the diagnostic trouble code of the
cruise control system (Refer to

P.17-10

).

Q: Is DTC 15 set?

YES : Replace the ECM [Refer to GROUP 13A, Engine

Control Module (ECM)

P.13A-920

]. When the ECM is

replaced, register the encrypted code (Refer to
GROUP 42C, Diagnosis

− ID Code Registration

Judgment Table

P.42C-9

). Then go to Step 21.

NO : 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.00-15

).

STEP 21. Using scan tool MB991958, check data list item
75: Cancel switch, item 86: Main switch, item 91: Resume
switch and item 92: Set 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 75: Cancel switch.

• When "CANCEL" switch is pressed, the display on

scan tool MB991958 should be "ON".

• When "CANCEL" switch is released, the display on

scan tool MB991958 should be "OFF".

• Item 86: Main switch.

• When "ON/OFF" switch is pressed, the display on

scan tool MB991958 should be "ON".

• When "ON/OFF" switch is pressed again, the display

on scan tool MB991958 should be "OFF".

• Item 91: Resume switch.

• When "ACC/RES" switch is pressed, the display on

scan tool MB991958 should be "ON".

• When "ACC/RES" switch is released, the display on

scan tool MB991958 should be "OFF".

• Item 92: Set switch.

• When "COAST/SET" switch is pressed, the display

on scan tool MB991958 should be "ON".

• When "COAST/SET" switch 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.

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-26

Q: Is the switch operating properly?

YES : Go to Step 22.
NO : Return to Step 2.

STEP 22. Read the DTC.
(1) Disconnect the negative (

−) battery terminal, to erase the

DTC of the cruise control system.

(2) Connect the negative (

−) battery cable.

(3) Turn the ignition switch to the "ON" position, and press the

"ON/OFF" switch to turn the cruise control system to ON
(turn on the "CRUISE" indicator light).

(4) After turning the cruise control system to ON, when 2

minutes or more has elapsed without operating the cruise
control switches, read the diagnostic trouble code of the
cruise control system (Refer to

P.17-10

).

Q: Is DTC 15 set?

YES : Return to Step 1.
NO : The procedure is complete.

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-27

DTC 22: Stoplight Switch System

AC709271

HEATED
SEAT

34

FUSIBLE
LINK

ETACS-
ECU

STOPLIGHT
SWITCH

STOPLIGHT

ENGINE
CONTROL
MODULE
(ECM)

WHITE

WHITE

BLACK-WHITE

RED

RED

BLACK

BLACK

BLACK

YELLOW-GRAY

YELLOW-GRAY

AB

Stoplight Switch System Circuit

AC709271

HEATED
SEAT

34

FUSIBLE
LINK

ETACS-
ECU

STOPLIGHT
SWITCH

STOPLIGHT

ENGINE
CONTROL
MODULE
(ECM)

WHITE

WHITE

BLACK-WHITE

RED

RED

BLACK

BLACK

BLACK

YELLOW-GRAY

YELLOW-GRAY

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

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-28

.

CIRCUIT OPERATION

• As for the stoplight switch, when the brake pedal

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

• As for the brake switch, when the brake pedal is

depressed, battery positive voltage is supplied to
the stoplight switch (terminal number 3), and
when the brake pedal is not depressed, the volt-
age of ECM (terminal number 108) will indicate 0
volt.

.

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 terminal number 108 and 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

DIAGNOSIS

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