Mitsubishi Lancer Evolution X. Manual - part 170

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-145

STEP 4. Scan tool service data
Check the following service data. (Refer to 

P.35C-276

.)

• Item 129: FL wheel cylinder pressure
• Item 130: FR wheel cylinder pressure
• Item 131: RL wheel cylinder pressure
• Item 132: RR wheel cylinder pressure

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Go to Step 10.

STEP 5. Brake drag check
Check the brake drag force. (Refer to GROUP 35A − On-vehicle 

Service 

P.35A-23

.)

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Adjust the brake drag, and then go to Step 11.

STEP 6. Brake pedal check
Refer to GROUP 35A − On-vehicle Service 

P.35A-12

.

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Adjust the brake pedal height to the standard value. 

(Refer to GROUP 35A − On-vehicle Service 

P.35A-12

.) Then go to Step 11.

STEP 7. Check for stoplight switch installation
Refer to GROUP 35A − On-vehicle Service 

P.35A-12

.

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Install the stoplight switch correctly. (Refer to GROUP 

35A − On-vehicle Service 

P.35A-12

.) Then go to Step 

11.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-146

STEP 8. Stoplight switch continuity check
(1) Remove the stoplight switch. (Refer to GROUP 35A − Brake 

Pedal 

P.35A-24

.)

(2) Connect the circuit tester (Ω range) to the stoplight switch 

connector terminal Nos. 1 and 2.

(3) When continuity does not exist with the plunger pressed 

from the outer case end face by the dimension shown in the 
figure, and when continuity exists with the plunger released, 
the switch is in good condition.

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the stoplight switch. (Refer to GROUP 35A − 

Brake Pedal 

P.35A-24

.) Then go to Step 11.

STEP 9. Brake booster check
Refer to GROUP 35A − On-vehicle Service 

P.35A-15

.

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Replace the brake booster. (Refer to GROUP 35A − 

Master Cylinder Assembly and Brake Booster 

P.35A-26

.) Then go to Step 11.

STEP 10. Check whether the DTC is reset.
Q: Is DTC C2001 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-298

.) Then go to Step 11.

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 11. Check whether the DTC is reset.
Q: Is DTC C2001 set?

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

AC901847AB

No continuity

Continuity

4.0 ± 0.5 mm 
(0.16 ± 0.02 in)

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-147

DTC C1000: Abnormality in stoplight switch circuit

STOPLIGHT 
SWITCH

JOINT
CONNECTOR
(4)

REAR
COMBINATION
LIGHT
(STOPLIGHT: LH)

REAR
COMBINATION
LIGHT
(STOPLIGHT: RH)

ETACS-
ECU

HIGH-MOUNTED
STOPLIGHT

Stoplight Circuit

AC804604

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-148

CAUTION

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

rect diagnostic trouble code may be set. Prior to this 

diagnosis, diagnose the CAN bus lines.

• Whenever the ECU is replaced, ensure that the CAN 

bus lines are normal.

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always perform the calibration of steering 

wheel sensor, G and yaw rate sensor, brake fluid pres-

sure sensor, cut valve, and inlet valve.(Refer to 

P.35C-287

, 

P.35C-289

, 

P.35C-294

, and 

P.35C-295

.)

.

CIRCUIT OPERATION

ETACS-ECU sends the ON signal generated when the brake 
pedal is depressed and OFF signal generated when the pedal 
is released to ASC-ECU via CAN bus lines.

.

DTC SET CONDITIONS

This diagnostic trouble code is set in the following case.

• The vehicle has run for a long time with the stoplight switch 

turned ON.

• The OFF status of the stoplight switch does not match the 

vehicle behavior.

.

PROBABLE CAUSES

• Improper adjustment of stoplight switch installation position
• Malfunction of the stoplight switch
• Malfunction of the stoplight
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• Malfunction of the ASC-ECU

AC708950

Connectors: C-43, C-47, C-48

AI

C-43 (B)

C-47

C-48

AC708972AL

Connectors: C-304, C-312

C-304

C-312

ETACS-ECU

AC708955AU

Connectors: D-11, D-17

D-17 (BR)

D-11

AC708970AW

Connectors: F-05, F-06, F-25, F-27

F-27

F-06

F-25

F-05 (GR)