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