Mitsubishi Outlander GS45X. Manual — part 455
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-247
Inspection Procedure 13: ASC-ECU power supply circuit system
Solenoid Valve, Motor and ASC-ECU Power Supply Circuit
FUSIBLE
LINK
27
FUSIBLE
LINK
26
SOLENOID
VALVE
POWER
SUPPLY
MOTOR
POWER
SUPPLY
ETACS-
ECU
ASC-ECU
POWER
SUPPLY
FUSIBLE
LINK
34
IG1
RELAY
IGNITION SWITCH
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-248
CAUTION
• When the ASC-ECU power supply voltage becomes 9.7
± 0.3 V or less, the ABS warning light, ASC warning dis-
play, and ASC OFF display illuminate, and the ABS, sta-
bility control, and TCL controls are prohibited.
• If the battery terminal is not tightened properly, a dump
surge may occur and the power supply voltage may
become abnormally high for a short time.
• 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
• 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
and
.
OPERATION
• ASC-ECU contains the power supply circuit (terminal No.
32) for the solenoid valve. The solenoid valve is energized
by the valve relay, which is incorporated in ASC-ECU.
• ASC-ECU contains the power supply circuit (terminal No.2)
for ASC-ECU. The power is supplied from the fusible link
No.34 through the multi-purpose fuse No.17.
AC901112
Connector: A-02
A-02 (B)
AF
AC901075 AB
Connector: C-33
AC702828AR
Connectors: C-309, C-315, C-317
C-309 (B)
C-315
C-317
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-249
• ASC-ECU contains the power supply circuit (terminal No.8)
for ASC-ECU. When the ignition switch (IG1) is turned ON,
the voltage is applied to the relay incorporated in
ETACS-ECU to turn ON the relay, and the power is supplied
from the fusible link No.34 through multi-purpose fuse
No.12.
• ASC-ECU contains the power supply circuit (terminal No.1)
for the pump motor. The pump motor is energized by the
motor switch, which is incorporated in ASC-ECU.
• When malfunction occurs in ASC-ECU power supply, the
communication with scan tool becomes unavailable.
.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Malfunction of fuse or fusible link
• Improper tightening of battery terminal
• Improper tightening of grounding bolt
• Battery failure
• Charging system failed
• ASC-ECU malfunction
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. Battery check
Refer to GROUP 54A
− Battery Test
.
Q: Is the battery in good condition?
YES : Go to Step 3.
NO : Charge or replace the battery. Then go to Step 2.
STEP 2. Charging system check
Refer to GROUP 16
− On−vehicle Service/Output Current Test
Q: Is the charging system in good condition?
YES : Go to Step 3.
NO : Repair or replace the charging system component(s).
STEP 3. Connector check: A-02 ASC-ECU connector, C-33
intermediate connector, C-317 ETACS-ECU connector,
C-315 ETACS-ECU connector
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the damaged connector.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-250
STEP 4. Voltage measurement at the A-02 ASC-ECU
connector
(1) Disconnect the ASC-ECU connector, connect special tool
ASC check harness (MB991997) to the harness-side
connector, and then measure the voltage at the special tool
connector side.
NOTE: Do not connect the special tool ASC check harness
(MB991997) to ASC-ECU.
(2) Measure the voltage between terminal No.32 and body
ground.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 5.
STEP 5. Fusible link check: Check the fusible link No.27.
Q: Is the check result normal?
YES : The open circuit may be present in the power supply
circuit. Repair the wiring harness between the A-02
ASC-ECU connector terminal No.32 and the fusible
link No.27. Then go to Step 20.
NO : Go to Step 6.
AC606869ME
ASC-ECU
MB991997
Check harness
A-02 ASC-ECU
harness connector
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