Mitsubishi Lancer Evolution IX. Manual - part 497

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-19

Code No.16: ABS-ECU Power Supply System (abnormal voltage drop or rise)

OPERATION

The ABS-ECU power is supplied to the ABS-ECU 
(terminal 10) from the ignition switch (IG2) through 
the multi-purpose fuse number 12 in the junction 
block.

DIAGNOSIS CODE SET CONDITIONS

Output is provided when ABS-ECU power supply 
voltage drops below or rises above the normal value. 
Output is not provided if power supply voltage 
returns to normal voltage.

PROBABLE CAUSES

The most likely causes for this diagnosis code to set 
are:

• Malfunction of battery

• Damaged wiring harness and connector

• Malfunction of brake modulator hydraulic unit and 

ABS-ECU

DIAGNOSIS

STEP 1. Check the battery.
Refer to GROUP 54A, Battery 

− On-vehicle Service 

− Battery Test 

P.54A-5

.

Q: Is the battery damaged?

YES : 

Charge or replace the battery and then go 

to Step 5.

NO : 

Go to Step 2.

STEP 2. Check the charging system.
Refer to GROUP 16, Charging System 

− On-vehicles 

Service 

P.16-5

.

Q: Is the charging system damaged?

YES : 

Repair the Charging System and then go to 

Step 5.

NO : 

Go to Step 3.

IGNITION
SWITCH (IG2)

ABS-ECU

POWER
SUPPLY

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

Power Supply Circuit

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-20

STEP 3. Check the following connectors.

•

ABS-ECU connector B-118

•

Intermediate connector C-124

•

Junction block connectors C-210, C-211
Check the connectors for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.

Q: Are the connectors and terminals in good 

condition?
YES : 

Go to Step 4.

NO : 

Repair it and then go to Step 5.

STEP 4. Check the following harness wire.

The wire between ABS-ECU connector B-118 (termi-
nal 10) and junction block connector C-211 (terminal 
2)

Q: Is the harness wire damaged?

YES : 

Repair or replace it and then go to Step 5.

NO : 

Go to Step 5.

AC211901AD

B-118 (B)

Connector: B-118

28

32

34

12

11

33

30

21

9

10

22

31

7

8

29

20 19

24

2

26

4

5

6

27

18 17

3

25

16 15

1

23

13

14

Harness side

AC211265

Connector: C-124 

AR

18

3

16

15

14

1 2

17

4 5

8

20

19

6 7

2122

9 10

25

13

24

23

12

11

AC212152

Connectors: C-210, C-211

C-210

C-211

AC

Junction block
(Front view)

Connector C-210
(Harness side)

4

6 5

3

2

1

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Connector C-211
(Harness side)

AC211901AD

B-118 (B)

Connector: B-118

28

32

34

12

11

33

30

21

9

10

22

31

7

8

29

20 19

24

2

26

4

5

6

27

18 17

3

25

16 15

1

23

13

14

Harness side

AC211269

Connector: C-211 

AL

Junction block
(Front view)

Harness side

4

6 5

3

2

1

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-21

STEP 5. Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.

(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Does diagnosis code No.16 reset?

YES : 

Start over at Step 1.

NO : 

The procedure is complete.

AC207179AB

M.U.T.-II

16-PIN

<Using the M.U.T.-II>

AC210056

AC

MB991911

16-PIN

MB991827

MB991824 

<Using the M.U.T.-III>

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-22

Code No.32: Longitudinal G-Sensor System

OPERATION

The G-sensor detects the acceleration level in the 
forward/reverse direction of the vehicle, converts the 
signals into voltage signals and then sends that sig-
nal to the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS

This code is set in the following case.

•  When the G-sensor output is 0.5 V or lower or 

4.5 V or higher (disconnected G-sensor or G-sen-
sor short circuit)

•  If the G-sensor output power does not change 

(G-sensor output fastening).

PROBABLE CAUSES

The most likely causes for this diagnosis code to set 
are:

• Malfunction of the G-sensor

• Damaged wiring harness and connector

• Malfunction of the brake modulator hydraulic unit 

(integrated with ABS-ECU)

IGNITION
SWITCH (IG2)

G-SENSOR
(LONGITUDINAL)

ABS-ECU

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

Longitudinal G-Sensor Circuit