Mitsubishi Evolution X. Manual - part 216

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-33

STEP 11. Check the harness wire between ECM connector 
B-10 terminal number 108 and stoplight switch connector 
C-48 terminal number 3, between stoplight switch 
connector C-48 terminal number 4 and ground for damage.

AC709275

AB

ETACS-ECU

Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO :  Repair the damaged harness wire. Then go to Step 

16.

STEP 12. Check the stoplight switch.
(1) Remove the stoplight switch (Refer to GROUP 35A, Brake 

Pedal 

P.35A-25

).

AC601576 AD

C-48 Stoplight switch
connector

AC601575

Continuity

No continuity

4.5 mm (0.18 in)

AC

(2) Connect an ohmmeter to the stoplight switch between 

terminals number 3 and 4.

(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 number 3 and 4 when the plunger 
is released, and if resistance value is less than 2 ohms 
between terminals number 3 and 4 when the plunger is 
pushed in to a depth of within 4.5 mm (0.18 inch) from the 
outer case edge surface.

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 13.

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

Brake Pedal 

P.35A-25

). Then go to Step 16.

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 13. 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 14
NO :  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 .

STEP 14. Using scan tool MB991958, check data list item 
74: Brake light switch and 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 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".

• 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 : 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

).

NO :  Return to Step 2.

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 15. 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) With the cruise control switches not operated, depress the 

brake pedal for several seconds, and then read the DTC of 
the cruise control system (Refer to 

P.17-10

).

Q: Is DTC 22 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 16 .

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 16. Using scan tool MB991958, check data list item 
74: Brake light switch and 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 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".

• 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 17
NO :  Return to Step 2.

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-36

STEP 17. 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) With the cruise control switches not operated, depress the 

brake pedal for several seconds, and then read the DTC of 
the cruise control system (Refer to 

P.17-10

).

Q: Is DTC 22 set?

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

DTC 23: ECM and Its Related Component

.

DTC SET CONDITIONS

This DTC is set when there is an failure in the ECM 
and its related components.

.

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

• Malfunction of the MFI system.

• 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