Mitsubishi Evolution X. Manual — part 215

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-29

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect DTC may be set. Prior to this diagnosis, diagnose
the CAN bus lines.

• Whenever the ECM is replaced, ensure that the CAN

bus lines are normal.

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

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
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-14

).

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".

(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 9.
NO : Go to Step 3.

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ENGINE AND EMISSION CONTROL

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STEP 3. Using scan tool MB991958, check ETACS system
data list item 290: 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 ETACS

system (Refer to GROUP 54A, ETACS

− Data List

Reference Table

P.54A-630

).

• Item 290: 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".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the switch operating properly?

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 16 .

NO : Go to Step 4.

STEP 4. Check stoplight switch connector C-48 and
ETACS-ECU connector C-304 and C-312 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Is the connectors and terminals in good condition?

YES : Go to Step 5.
NO : Repair or replace the faulty connector. Then go to

Step 16.

STEP 5. Check the harness wire between ETACS-ECU
connector C-304 terminal number 1 and stoplight switch
connector C-48 terminal number 2, between stoplight
switch connector C-48 terminal number 1 and ETACS-ECU
connector C-312 terminal number 16 for damage.
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO : Repair the damaged harness wire. Then go to Step

16.

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ENGINE AND EMISSION CONTROL

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STEP 6. Check the stoplight switch.
(1) Remove the stoplight switch (Refer to GROUP 35A, Brake

Pedal

P.35A-25

).

AC601574 AD

C-48 Stoplight switch
connector

AC601575

Continuity

No continuity

4.0 mm (0.16 in)

AB

(2) Connect an ohmmeter to the stoplight switch between

terminals number 1 and 2.

(3) Check for continuity between the terminal 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 number 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 number 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-25

). Then go to Step 7.

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

Brake Pedal

P.35A-25

). Then go to Step 16.

STEP 7. Check fuse number 2 at the ETACS-ECU.

AC709274

AB

ETACS-ECU

Fuse number 2
(Housing color: Blue)

Brake pedal

Q: Is the fuse in good condition?

YES : Go to Step 8.
NO : Replace the fuse. Then go to Step 16.

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STEP 8. Using scan tool MB991958, check ETACS system
data list item 290: 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 ETACS

system (Refer to GROUP 54A, ETACS

− Data List

Reference Table

P.54A-630

).

• Item 290: 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".

(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 9.
NO : Replace the ETACS-ECU (Refer to GROUP 54A,

ETACS-ECU

P.54A-676

). Then go to Step 16.

STEP 9. Using scan tool MB991958, check data list item 89:
Normally closed brake 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 89: Normally closed 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 15.
NO : Go to Step 10.

STEP 10. Check ECM connector B-10 and stoplight switch
connector C-48 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 11.
NO : Repair or replace the faulty connector. Then go to

Step 16.