Mitsubishi Evolution X. Manual — part 776
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-111
DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is
detected.
• When the brake fluid pressure is decreased for a long time.
• When the brake fluid pressure is held for a long time.
NOTE: ASC controls the vehicle based on the wheel speed sig-
nal. When the brake fluid pressure is decreased or held for an
abnormally long time, the wheel speed sensor signal may have
a problem.
.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• External noise interference
• Malfunction of wheel speed sensor
• ABS-ECU malfunction
• Excessive gap between the wheel speed sensor and the
wheel speed detection encoder
• Adhesion of foreign materials on the wheel speed sensor
• Adhesion of foreign materials on the wheel speed detection
encoder
• Wheel bearing malfunction
• Improper installation of the wheel speed sensor
• Deformation of the wheel speed detection encoder
• Disturbance of magnetization pattern for wheel speed
detection encoder
• Missing teeth of the wheel speed detection encoder
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
• MB991997: ASC check harness
STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines. (Refer to GROUP 54C
−
Troubleshooting
.) After repairing the CAN
bus line, go to Step 2.
STEP 2. DTC recheck after repairing the CAN bus line
Q: Is DTC C1049 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-112
STEP 3. Scan tool diagnostic trouble code
Check whether DTC No. C102B, C1032, C1035, and C1044
are simultaneously set.
Q: Are DTC C102B, C1032, C1035 and C1044 also set?
YES : Carry out the diagnosis for the diagnostic trouble
codes that are set, and then go to Step 5.
NO : Go to Step 4.
STEP 4. Scan tool service data
Check the following service data. (Refer to
.)
• Item No.04: RR wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 16.
NO : Go to Step 5.
STEP 5. Voltage measurement at A-05 ASC-ECU connector
(1) Disconnect the ASC-ECU connector, connect the ASC
check harness (Special tool: MB991997) to the wiring
harness-side connector, and then measure at the special
tool connector side.
NOTE: Do not connect the special tool to ASC-ECU.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the wheel speed sensor
power supply terminal (signal terminal) No. 43 and the body
ground as well as between the ground terminal No. 42 and
the body ground.
OK: 1 volt or less
Q: Is the check result normal?
YES : Go to Step 6.
NO (Not normal at the terminal No. 43 or 42) : Go to Step
7.
AC400817CK
ASC-ECU
MB991997
Check harness
A-05 ASC-ECU
harness connector
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-113
STEP 6. Resistance measurement at A-05 ASC-ECU
connector
(1) Disconnect the ASC-ECU connector, connect the ASC
check harness (Special tool: MB991997) to the wiring
harness-side connector, and then measure at the special
tool connector side.
NOTE: Do not connect the special tool to ASC-ECU.
(2) Measure the resistance between the wheel speed sensor
circuit power supply terminal (signal terminal) No. 43 and
the body ground as well as between the ground terminal
No. 42 and the body ground.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 9.
NO (Not normal at the terminal No. 43 or 42) : Go to Step
7.
STEP 7. Connector check: A-05 ASC-ECU connector, C-47
intermediate connector, D-09 wheel speed sensor <RR>
connector
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair the defective connector. Then go to Step 17.
STEP 8. Wiring harness check between A-05 ASC-ECU
connector terminal No. 43 and D-09 wheel speed sensor
<RR> connector terminal No. 1, and between A-05
ASC-ECU connector terminal No. 42 and D-09 wheel speed
sensor <RR> connector terminal No. 2
• Short circuit check of wheel speed sensor <RR> circuit
Q: Is the check result normal?
YES : Replace the wheel speed sensor <RR>. (Refer to
.) Then go to Step 17.
NO : Repair the wiring harness. Then go to Step 17.
AC400817CL
ASC-ECU
MB991997
Check harness
A-05 ASC-ECU
harness connector
DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-114
STEP 9. Voltage measurement at A-05 ASC-ECU connector
(1) Disconnect the ASC-ECU connector, connect the ASC
check harness (Special tool: MB991997) to the
ASC-ECU-side connector and the wiring harness-side
connector, and then measure at the special tool connector
side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the wheel speed sensor
circuit power supply terminal (signal terminal) No. 43 and
the body ground.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 12.
STEP 10. Wiring harness check between A-05 ASC-ECU
connector terminal No. 43 and D-09 wheel speed sensor
<RR> connector terminal No. 1, and between A-05
ASC-ECU connector terminal No. 42 and D-09 wheel speed
sensor <RR> connector terminal No. 2
• Open circuit check of wheel speed sensor <RR> circuit
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair the wiring harness. Then go to Step 17.
STEP 11. Check of wheel speed sensor as a single unit
Refer to
.
Q: Is the check result normal?
YES : Go to Step 13.
NO : Replace the wheel speed sensor <RR>. (Refer to
.) Then go to Step 17.
STEP 12. Connector check: A-05 ASC-ECU connector,
C-47 intermediate connector, D-09 wheel speed sensor
<RR> connector
Q: Is the check result normal?
YES : Go to Step 16.
NO : Repair the defective connector. Then go to Step 17.
AC400817CM
ASC-ECU
MB991997
Check harness
A-05 ASC-ECU
harness connector
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