Mitsubishi Lancer Evolution IX. Manual - part 500

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-31

STEP 3. Check the following harness wires.

•

The wire between fusible link No.3 and ABS-ECU 

connector B-118 (terminal 11)

• The wire between fusible link No.3 and ABS-ECU 

connector B-118 (terminal 33)

Q: Is any harness wire damaged?

YES : 

Repair or replace it and then go to Step 4.

NO : 

Go to Step 4.

STEP 4. 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: Do diagnosis codes 41, 42, 43, 44, 52, 53 or 55 

reset?
YES : 

Return to Step 1.

NO : 

The procedure is complete.

AC208825 AL

Fusible link: No.3

No.3

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

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-32

Code No.71: Lateral G-Sensor System

OPERATION

The lateral G-sensor detects the acceleration level in 
the left/right direction of the vehicle, converts the sig-
nals into voltage signals and then sends that signal 
to the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS

This code is set in the following cases:

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

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

•  If the lateral G-sensor output power does not 

change (lateral G-sensor output fastening).

PROBABLE CAUSES

The most likely causes for diagnosis code to set are:

• Malfunction of the lateral G-sensor

• Damaged wiring harness and connector

• Malfunction of the brake modulator hydraulic unit 

(integrated with ABS-ECU)

IGNITION
SWITCH (IG2)

G-SENSOR
(LATERAL)

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

Lateral G-Sensor Circuit

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-33

DIAGNOSIS

STEP 1.M.U.T.-II/III data list.

CAUTION

To prevent damage to M.U.T.-II/III, always turn the 
ignition switch to the "LOOK" (OFF) position 
before connecting or disconnecting M.U.T.-II/III.

(1) Connect M.U.T.-II/III as shown in the illustration.

(2) Start the engine.
(3) Set M.U.T.-II/III to data reading mode for following 

item.

• Item 71: Lateral G-sensor

OK:

When vehicle is stationary (level): 2.4 

− 2.6 

V

When vehicle is being driven: 1.0 

− 4.0 V

Q: Is the lateral G-sensor input normal?

YES : 

This malfunction is intermittent. Refer to 

GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope With Intermittent Malfunction 

P.00-5

. 

NO : 

Go to Step 2.

STEP 2. Check the power supply circuit. Voltage 
measurement at lateral G-sensor connector D-37.

(1) Disconnect connector D-37, and check at the 

harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and 

earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 4.

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>

AC212253AD

Connector: D-37

D-37 (B)

Connector D-37
(Harness side)

3

1

2

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-34

STEP 3. Check the earth circuit. Resistance 
measurement at lateral G-sensor connector D-37.

(1) Disconnect connector D-37, and check at the 

harness side.

(2) Measure the resistance between terminal 3 and 

earth.

OK: 2 ohms or less

Q: Is the resistance 2 ohms or less?

YES : 

Go to Step 8.

NO : 

Go to Step 6.

STEP 4. Check the following connectors.

•

Lateral G-sensor connector D-37

•

Junction block connectors C-211, C-214
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 5.

NO : 

Repair it and then go to Step 11.

AC212253

AD

Connector: D-37

D-37 (B)

Connector D-37
(Harness side)

3

1

2

AE

AC208854AF

Connector: D-37

D-37 (B)

Harness side

3

1

2

AC212152AD

Connectors: C-211, C-214

C-211

C-214

Junction block
(Front view)

Connector C-211
(Harness side)

Connector C-214
(Harness side)

4

6 5

3

2

1

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13