Mitsubishi Outlander GS45X. Manual - part 376

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-125

DTC C2100 Abnormality in battery voltage (low voltage)

IG1 
RELAY

AC901471

ABS-ECU Power Supply Circuit

FUSIBLE 
LINK

27

FUSIBLE 
LINK

26

ETACS-
ECU

ABS-ECU

POWER 
SOURCE

SOLENOID VALVE 
POWER SOURCE

MOTOR POWER 
SOURCE

FUSIBLE 
LINK

34

IGNITION
SWITCH

AB

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-126

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

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

.

OPERATION

The ABS-ECU is energized by the valve power supply circuit 
(terminal No.26). When the power is supplied from the ignition 
switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay is 
turned on. At this time, the valve power supply circuit (terminal 
No.7) energizes the ABS-ECU.

.

DTC SET CONDITIONS

This DTC is set when the ABS-ECU power supply voltage 
drops below 9.7 

± 0.3 V during driving

.

PROBABLE CAUSES

• Battery failure

• Battery terminal loose

• Fusible link malfunction

• Damaged wiring harness and connectors

• ABS-ECU malfunction

• Charging system failed

AC901112

Connector: A-01

A-01 (B)

AE

AC901075 AB

Connector: C-33

AC900844AY

Connector: C-210

AC702828AG

C-309 (B)

C-317

Connectors: C-309, C-317

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-127

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. 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 DTC C2100 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 :  Charge or replace the battery. Then 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 : Go to Step 5.
NO :  Repair or replace the charging system component(s).

STEP 5. Connector check: A-01 ABS-ECU connector, C-33 
intermediate connector, C-210 ignition switch connector, 
C-309 ETACS-ECU connector, C-317 ETACS-ECU 
connector
Q: Is the check result normal?

YES : Go to Step 6.
NO  :  Repair the damaged connector.

STEP 6. Fusible link check: Check the fusible link No.27.
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Go to Step 7.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-128

STEP 7. Resistance measurement at A-01 ABS-ECU 
connector
(1) Removal the fusible link No.27.
(2) 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.

(3) Measure the resistance between the terminal No.26 and the 

body ground.

OK: No continuity

Q: Is the check result normal?

YES : Replace the fusible link No.27. Then go to Step 20.
NO :  The 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, and then replace the fusible link No.27. 
Then go to Step 20.

STEP 8. Voltage measurement at the A-01 ABS-ECU 
connector
(1) Disconnect the ASC-ECU connector, connect special tool 

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

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

ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 9.
NO :  The open 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. Then go to Step 20.

AC606869 HM

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

AC606869 DY

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector