Mitsubishi Outlander GS45X. Manual — part 383
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-153
COMMENTS ON TROUBLE SYMPTOM
This may be caused by ground fault in the parking brake switch
circuit.
.
PROBABLE CAUSES
• The brake pad thickness is at the limit value or less.
• The brake fluid amount is at the "LOWER" level or lower.
• Poor adjustment of the parking brake lever
• Damaged wiring harness and connectors
• Parking brake switch malfunction
• Brake fluid level switch malfunction
• Combination meter malfunction
• Malfunction of ETACS-ECU
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
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
Use scan tool MB991958 to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics Table
).
STEP 2. Scan tool DTC.
Use scan tool MB991958 to check the diagnostic trouble code
for the ABS system.
Q: Is the DTC set?
YES : Carry out the diagnosis for the DTC.
NO : Go to Step 3.
STEP 3. Scan tool DTC for other systems.
Use scan tool MB991958 to check that the DTC is set in the
combination meter and ETACS-ECU.
Q: Is the DTC set?
YES : Carry out the diagnosis for the DTC.
NO : Go to Step 4.
STEP 4. Brake fluid level check
Check that the brake fluid is filled up to the "MIN" level or
higher.
Q: Is the check result normal?
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-154
STEP 5. Brake pad check
Refer to GROUP 35A
− On-vehicle Service/Brake Pad Check
.
Q: Is the check result normal?
YES : Fill the brake fluid up to the "MAX" level. Then go to
Step 18.
NO : Replace the brake pad (Refer to GROUP 35A
−
On-vehicle Service/Brake Pad Replacement
). Then go to Step 18.
STEP 6. Brake fluid level switch check
Refer to GROUP 35A
− On-vehicle Service/Brake Fluid Level
Switch Check
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the reservoir tank assembly (Refer to
GROUP 35A
− Master Cylinder Assembly and Brake
Booster Assembly
STEP 7. Connector check: A-09 brake fluid level switch
connector, C-312 ETACS-ECU connector
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair the damaged connector.
STEP 8. Measure the voltage at A-09 brake fluid level
switch connector.
(1) Disconnect the connector, and measure at the wiring
harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the terminal No.1 and the
body ground.
OK: Approximately system voltage
Q: Is the check result normal?
ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-155
STEP 9. Measure the voltage at the C-312 ETACS-ECU
connector.
CAUTION
With the C-312 ETACS-ECU connector kept connected, dis-
connect the A-09 brake fluid level switch connector.
(1) Turn the ignition switch to the ON position.
(2) Measure the voltage between terminal No. 1 and the body
ground by backprobing.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Check the wiring harness between the C-312
ETACS-ECU connector terminal No.1 and the A-09
brake fluid level switch connector terminal No.1.
NO : Replace the ETACS-ECU (Refer to GROUP 54A
−
ETACS-ECU
STEP 10. Wiring harness check: between A-09 brake fluid
level switch connector and body ground
Check for open circuit in the harness wire between A-09 brake
fluid level switch connector terminal No.2 and body ground.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair the wiring harness.
STEP 11. Parking brake lever stroke check
Refer to GROUP 36
− On-vehicle Service/Parking Brake Lever
Stroke Check and Adjustment
Q: Is the check result normal?
YES : Go to Step 12.
NO : Adjust the parking brake lever stroke (Refer to
GROUP 36
− On-vehicle Service/Parking Brake Lever
Stroke Check and Adjustment
). Then go to
Step 18.
STEP 12. Parking brake switch check
Refer to GROUP 36
− On-vehicle Service/Parking Brake
Switch Check
Q: Is the check result normal?
YES : Go to Step 13.
NO : Replace the parking brake switch (Refer to GROUP
36
− Parking Brake Lever
). Then go to Step
18.
STEP 13. Connector check: D-125 parking brake switch
connector
Q: Is the check result normal?
YES : Go to Step 14.
NO : Repair the damaged connector.
ABS DIAGNOSIS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-156
STEP 14. Measure the voltage at D-125 parking brake
switch connector.
(1) Disconnect the connector, and measure at the wiring
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the terminal No.1 and the
body ground.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 17.
NO : Go to Step 15.
STEP 15. Connector check: C-03 combination meter
connector, C-22 intermediate connector
Q: Is the check result normal?
YES : Go to Step 16.
NO : Repair the damaged connector.
STEP 16. Voltage measurement with C-03 combination
meter connector
(1) Release the parking brake lever (status that the lever is not
operated).
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No.4 and the body
ground by backprobing without disconnecting the
connector.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Repair the wiring harness between the C-03
combination meter connector terminal No.4 and the
D-125 parking brake switch connector terminal No.1.
NO : Go to Step 17.
STEP 17. Retest the system.
Q: Does the brake warning light turn ON and OFF normally
according to the parking brake lever operation?
YES : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
NO : Replace the combination meter assembly (Refer to
GROUP 54A
− Combination Meter
). Then
go to Step 18.
STEP 18. Retest the system.
Q: Does the brake warning light turn ON and OFF normally
according to the parking brake lever operation?
YES : The procedure is complete.
NO : Return to Step 1.
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