Mitsubishi Outlander GS45X. Manual - part 460

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-267

STEP 13. Retest the system.
Check if the HSA works with one occupant (driver) only in the 
vehicle.
Q: Is the check result normal?

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

Inspection Procedure 16: HSA (Hill Start Assist) works on a flat road.

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 (Refer to 
GROUP 54C 

− CAN Bus Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

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

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake 
fluid pressure sensor (Refer to 

P.35C-282

, 

P.35C-283

 

and 

P.35C-284

).

.

COMMENTS ON TROUBLE SYMPTOM

• A failure may have occurred in the calibration of the G & 

yaw rate sensor.

• Some drivers mistake a brake dragging for HSA operation.

• If the suspension is modified, the vehicle posture changes, 

and the ASC-ECU judges that the vehicle is on a steep 
slope and may activate HSA.

.

PROBABLE CAUSES

• Improper installation of the G and yaw rate sensor

• G and yaw rate sensor malfunction

• Brake drag

• Damaged wiring harness and connectors

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-268

STEP 1. HSA operation check
Check if the HSA works on a flat road with one occupant 
(driver) only in the vehicle.
Q: Does the HSA work on a flat road?

YES : Go to Step 2
NO :  The procedure is complete.

STEP 2. Using scan tool MB991958, check the data list
Check the following data list (Refer to 

P.35C-270

).

• Item 09: G sensor

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Go to Step 3

STEP 3. G and yaw rate sensor installation check
Check that the G and yaw rate sensor is installed correctly.
Q: Is the check result normal?

YES : Carry out the calibration of the G and yaw rate sensor 

(Refer to 

P.35C-282

). Then go to Step 4

NO :  Reinstall the G and yaw rate sensor correctly (Refer 

to 

P.35C-290

), and then go to Step 5.

STEP 4. Brake drag check
Check the brake system for drag.
Q: Is the check result normal?

YES : Go to Step 5
NO :  Repair the brake drag, and then go to Step 5.

STEP 5. Retest the system.
Check if the HSA works on a flat road with one occupant 
(driver) only in the vehicle.
Q: Does the HSA work on a flat road?

YES : Return to Step 2.
NO :  The procedure is complete.

Inspection Procedure 17: The initial check sound of hydraulic unit is loud.

CAUTION

When installing brake tube, match the axial center of flare 

nut and brake tube with the center of hole at the 
hydraulic unit side, and check that the fluid does not 
leak.

.

COMMENT ON TROUBLE SYMPTOM

The operation sound may be decreased by reducing the load at 
the rubber mount portion of the brake tube and hydraulic unit. 

.

PROBABLE CAUSES

• Improper installation of the hydraulic unit

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-269

• Improper installation of the brake tube

DIAGNOSIS

DRIVING CHECK
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) When vehicle speed reaches 6 mph (10 km/h), check the 

operating sound volume and compare it with that of the 
same model.

OK: The operating sound is the same volume or 
less by comparing with that of the same model.

Q: Is the check result normal?

YES : This diagnosis is complete.
NO :  Carry out adjustment for hydraulic unit installation. 

(Refer to 

P.35C-277

).

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-270

DATA LIST REFERENCE TABLE

M1355001500852

The following items of ECU input data can be read 
using scan tool.

Item No. Check item

Check condition

Normal condition

01

FL wheel speed sensor

Perform a test run of the vehicle.

The speedometer display and 
the scan tool display almost 
agree with each other. 
<During stop: approximately 
0.4 mph (0.7km/h)>

02

FR wheel speed sensor

03

RL wheel speed sensor

04

RR wheel speed sensor

05

Power supply voltage

Battery positive voltage (10 to 
18 V ASC operatable range)

07

Brake switch (input)

The brake pedal is depressed.

ON

The brake pedal is released.

OFF

08

Lateral G sensor (+: left 
turn, -: right turn)

Vehicle stopped (level)

-0.11 to 0.11 G

Running

-1 to 1 G

09

G sensor (+: 
deceleration, -: 
acceleration)

Vehicle stopped (level)

• 0 G

*1

 (fixed value)

 

<Vehicles with FWD>

• -0.15 to 0.15 G 

<Vehicles with AWD, FWD 
with idle neutral control>

Running

FWD

0 G

*1

 (fixed value)

AWD

-1 to 1 G

10

Master cylinder pressure 
(+: pressure increase, -: 
pressure decrease)

The brake pedal is depressed.

Increases by the amount of 
the brake pedal depression.

The brake pedal is released.

-3 to 3 bar

11

Steering angle (+: left 
turn, -: right turn)

Vehicle stopped (the steering wheel is 
in the neutral position)

-6 to 6 deg

Running

Nearly the same as the 
steering wheel operation 
angle <-720 to 720 deg 
(ASC-ECU normal detection 
value)>
Nearly the same as the 
steering wheel operation 
angle <-850 to 850 deg 
(Sensor normal value as a 
single unit)>

12

Yaw rate sensor (+: left 
turn, -: right turn)

Vehicle stopped (level)

-3.6 to 3.6 deg/s

Running

-100 to 100 deg/s

14

Brake switch

The brake pedal is depressed.

ON

The brake pedal is released.

OFF

15

Emission test mode

Emission test mode: ON

ON

Emission test mode: OFF

OFF