Mitsubishi Outlander GS45X. Manual — part 389
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-177
STEP 4. Wheel alignment check
At the same time with the following checks, also check that no
parts other than the genuine parts are mounted.
• Front wheel alignment check (Refer to GROUP 33 −
On-vehicle Service/Front Wheel Alignment Check and
Adjustment
.)
• Rear wheel alignment check (Refer to GROUP 34 −
On-vehicle Service/Rear Wheel Alignment Check and
Adjustment
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the part(s) having damage or other
problems. Then go to Step 9.
STEP 5. Scan tool data list
Check the following data list (Refer to
• Item No. 01: FL wheel speed sensor
• Item No.02: FR wheel speed sensor
• Item No.03: RL wheel speed sensor
• Item No.04: RR wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Wheel speed sensor check
Check that no non-genuine electronic device or no wiring har-
ness of other than genuine electronic device is mounted near
the wheel speed sensor (at wheel speed detection section and
wiring harness section) (Refer to
).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Remove the non-genuine electronic device or the
wiring harness of non-genuine electronic device.
Then go to Step 9.
STEP 7. Hydraulic unit check
Carry out the following actuator tests, and check if they work
normally (Refer to
• Item No. 01: FL wheel ABS
• Item No.02: FR wheel ABS
• Item No.03: RL wheel ABS
• Item No.04: RR wheel ABS
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the hydraulic unit (integrated with ABS-ECU)
(Refer to
). Then go to Step 9.
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-178
STEP 8. ABS operation check
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
NO : Replace the hydraulic unit (integrated with ABS-ECU)
(Refer to
). Then go to Step 9.
STEP 9. ABS operation check
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 10: 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
• 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
).
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-179
DATA LIST REFERENCE TABLE
M1352011501385
The following items can be read by the scan tool
from the ABS-ECU input data.
The following items of ECU input data can be read
using scan tool.
1. The system is normal.
2. System shutdown by ECU
While ABS-ECU is disabled by the diagnostic
function, the scan tool displayed data is different
from the actual measurement.
ACTUATOR TEST REFERENCE TABLE
M1352011601100
Using scan tool, the following actuators can be forc-
ibly operated:
NOTE:
.
•
ABS is operated by ABS-ECU.
•
When ABS-ECU is disabled due to the fail-safe
function, the actuator test cannot be performed.
•
The actuator test can be performed only when
the vehicle is stationary.
•
While the actuator test is performed, the ABS
warning light flashes at a rate of 2 Hz.
•
After the actuator test has been performed, the
brake warning light and ABS warning light illumi-
nate until the ignition switch is turned to ON again
or the communication between scan tool and
ABS-ECU is terminated.
.
Actuator test specifications
.
Item No.
Check item
Check conditions
Normal conditions
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 ABS operatable range)
07
Brake switch (input)
The brake pedal is released.
OFF
The brake pedal is depressed.
ON
14
Brake switch (Stop light
switch)
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
87
Ignition switch (input)
Ignition switch is "ON" position
ON
88
Vehicle speed
Perform a test run of the vehicle. The speedometer display and
the scan tool display almost
agree with each other.
105
Power supply voltage (input)
Battery positive voltage (10 to
18 V ABS operatable range)
Item No.
Check item
Driven component
01
FR wheel ABS drive
Solenoid valve for the corresponding
wheel of the hydraulic unit and pump
motor (simplified inspection mode)
02
FL wheel ABS drive
03
RR wheel ABS drive
04
RL wheel ABS drive
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-180
Operation pattern of items 01 to 04
CHECK AT ECU TERMINALS
M1352011801427
.
TERMINAL VOLTAGE CHECK
Required Special Tool:
MB991974: ABS Check Harness
Connect the special tool ABS check harness (MB991974) to
measure the voltage between each check connector terminal
and the ground terminal (No.1 or 14).
AC608796
1second
2 seconds
End
Increase in pressure
Steady pressure
Reduction in pressure
Drive
Stop
Solenoid valve
Pump motor
M.U.T.-III actuator test
(Item No. 01, 02, 03, 04) start
Approximately
0.05 second
Approximately
0.01 second
AB
AC611138 AJ
ABS-ECU
MB991974
A-01 ABS-ECU
harness connector
Check harness
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