Mitsubishi Outlander GS45X. Manual — part 379

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-137

DTC C1608 Implausible diagnosis data

ETACS-
ECU

AC703731

ABS-ECU

34

27

26

IGNITION
SWITCH (IG1)

AB

Power Supply Circuit

FUSIBLE
LINK

FUSIBLE
LINK

FUSIBLE
LINK

1G1
RELAY

SOLENOID VALVE
POWER SUPPLY

MOTOR POWER
SUPPLY

POWER
SUPPLY

AC901112

Connector: A-01

A-01 (B)

AE

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-138

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect DTC may be set. Prior to this diagnosis, diagnose
the CAN bus lines (Refer to GROUP 54C

− CAN Bus

Line Diagnostic Flow

P.54C-10

).

• If the ABS-ECU connector is disconnected or the bat-

tery terminal is disconnected when the ignition switch
is ON, this DTC may be set.

• Since the failure information stored in the past is

erased after this diagnosis is carried out, reproduce the
state of malfunction.

.

OPERATION

The ABS-ECU stores DTCs and failure information in the
EEPROM

*

.

The ABS-ECU is energized by the solenoid valve power supply
circuit (terminal No.26).
NOTE:

*

:EEPROM (Electrical Erasable and Programmable

ROM)

.

DTC SET CONDITIONS

• This DTC is set when the failure information stored in the

EEPROM is not reliable. The failure information stored in
the past is not output, and only this DTC is set.

• This DTC may occur when ABS-ECU power supply shut-

down or drop between ABS-ECU is writing a data to the
EEPROM.

.

PROBABLE CAUSES

• Disconnection of the ABS-ECU connector or the battery ter-

minal when the ignition switch is ON

• Loose battery terminal

• Abnormality in battery

• Damaged wiring harness and connectors

• 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

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-139

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 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C

−

CAN Bus Diagnostics Table

P.54C-17

). On

completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C1608 set?

YES : Go to Step 3.
NO : The procedure is complete.

STEP 3. Battery check
Refer to GROUP 54A

− Battery Test

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 5.
NO : Go to Step 4.

STEP 4. Charging system check
Refer to GROUP 16

− On−vehicle Service/Output Current Test

P.16-9

(3.0L engine).

Q: Is the charging system in good condition?

YES : Replace the battery. Then go to Step 9.
NO : Repair or replace the charging system component(s).

STEP 5. Voltage measurement at the A-01 ABS-ECU
connector
(1) Disconnect the ABS-ECU connector, connect special tool

ABS check harness (MB991974) to the harness-side
connector, and then measure the resistance at the special
tool connector side.
NOTE: Do not connect the special tool ABS check harness
(MB991974) to ABS-ECU.

(2) Measure the voltage between the terminal No.26 and the

body ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 7.
NO : Go to Step 6.

AC606869AM

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-140

STEP 6. Connector check: A-01 ABS-ECU 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.26 and the
fusible link No.27.

NO : Repair the defective connector.

STEP 7. Resistance measurement at A-01 ABS-ECU
connector
(1) Disconnect the ABS-ECU connector, connect special tool

ABS check harness (MB991974) to the harness-side
connector, and then measure the resistance at the special
tool connector side.
NOTE: Do not connect the special tool ABS check harness
(MB991974) to ABS-ECU.

(2) Measure the resistance between the terminal No.1 and the

body ground, and between the terminal No.14 and the body
ground.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES : Go to Step 9.
NO : Go to Step 8.

STEP 8. Connector check: A-01 ABS-ECU connector
Q: Is the check result normal?

YES : An open circuit may be present in the ground circuit.

Repair the wiring harness between the A-01
ABS-ECU connector terminal No.1 and the body
ground, and between the A-01 ABS-ECU connector
terminal No.14 and the body ground.

NO : Repair the defective connector.

AC606869AP

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector