Mitsubishi Outlander XL. Manual — part 644
Inspection Procedure 8: ABS-ECU Power Supply Circuit System
M13502000202USA0000010000
Power Supply Circuit
ETACS-
ECU
POWER
SUPPLY
ABS-ECU
FUSIBLE
LINK
34
IG1
RELAY
FUSIBLE
LINK
27
FUSIBLE
LINK
26
SOLENOID VALVE
POWER SUPPLY
MOTOR POWER
SUPPLY
IGNITION
SWITCH (IG1)
SYSTEM OPERATION
⦆
The ABS-ECU power supply signal energized by the ignition
switch (IG1) is transmitted to ABS-ECU (terminal No. 7) via
the multi-purpose fuse No.12.
⦆
The ABS-ECU power supply and the valve power supply are
transmitted to ABS-ECU (terminal No. 26) via the fusible link
No. 27.
⦆
When malfunction occurs in ABS-ECU power supply, the
communication with scan tool becomes unavailable.
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-139
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
PROBABLE CAUSES
⦆
Damaged wiring harness and connectors
⦆
Battery failure
⦆
Charging system failed
⦆
ABS-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
⦆
MB991974: ABS check harness
STEP 1. Voltage measurement at the A-01 ABS-ECU
connector
ZC601293 0028
ABS-ECU
MB991974
Check harness
A-01 ABS-ECU
harness connector
(1)
Disconnect the connector, connect special tool MB991974 to
the harness-side connector, and measure the voltage at the
special tool connector side.
NOTE:
Do not connect the special tool MB991974 to ABS-
ECU.
(2)
Turn the ignition switch to the ON position.
(3)
Measure the voltage between terminal No. 7 and body
ground.
OK: 12 volts (Battery voltage)
Q:Is the check result normal?
YES:
Go to Step 2.
NO:
Go to Step 6.
35B-140
ANTI-LOCK BRAKING SYSTEM (ABS)
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
STEP 2. Voltage measurement at the A-01 ABS-ECU
connector
ZC601293 0024
ABS-ECU
MB991974
Check harness
A-01 ABS-ECU
harness connector
(1)
Disconnect the connector, connect special tool MB991974 to
the harness-side connector, and measure the voltage at the
special tool connector side.
NOTE:
Do not connect the special tool MB991974 to ABS-
ECU.
(2)
Turn the ignition switch to the ON position.
(3)
Measure the voltage between the terminal No. 26 and the
body ground.
OK: 12 volts (Battery voltage)
Q:Is the check result normal?
YES:
Go to Step 4.
NO:
Go to Step 3.
STEP 3. Connector check: A-01 ABS-ECU connector
Q:Is the check result normal?
YES:
Repair the wiring harness between the fusible link
No. 27 and the A-01 ABS-ECU connector terminal No. 32.
NO:
Repair the defective connector.
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-141
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
STEP 4. Voltage measurement at the A-01 ABS-ECU
connector
ZC601293 0026
ABS-ECU
MB991974
Check harness
A-01 ABS-ECU
harness connector
(1)
Disconnect the connector, connect special tool MB991974 to
the harness-side connector, and measure the voltage at the
special tool connector side.
NOTE:
Do not connect the special tool MB991974 to ABS-
ECU.
(2)
Turn the ignition switch to the ON position.
(3)
Voltage between the terminal No. 13 and the body ground
OK: 12 volts (Battery voltage)
Q:Is the check result normal?
YES:
Go to Step 7.
NO:
Go to Step 5.
STEP 5. Connector check: A-01 ABS-ECU connector
Q:Is the check result normal?
YES:
Repair the wiring harness between the fusible link
No. 26 and the A-01 ABS-ECU connector terminal No. 13.
NO:
Repair the defective connector.
STEP 6. Connector check: A-01 ABS-ECU connector, C-33
intermediate connector, C-317 junction block connector,
C-210 ignition switch connector
Q:Is the check result normal?
YES:
The open or short circuit may be present in the
power supply circuit. Repair the wiring harness between
the A-01 ABS-ECU connector terminal No. 7 and the C-210
ignition switch connector.
NO:
Repair the defective connector.
STEP 7. Wiring harness check between the A-01 ABS-ECU
connector terminal No. 1/14 and the body ground
⦆
Check the ground wires for open circuit.
Q:Is the check result normal?
YES:
Go to Step 8.
NO:
Repair the wiring harness.
STEP 8. Battery check
Refer to GROUP 54Aa - Battery Test P.54Aa-2.
Q:Is the battery in good condition?
YES:
Go to Step 9.
NO:
Charge or replace the battery.
35B-142
ANTI-LOCK BRAKING SYSTEM (ABS)
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
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