Mitsubishi Lancer (4A9 engine). Manual - part 140

REVERSING SENSOR SYSTEM

CHASSIS ELECTRICAL

54A-222

REVERSING SENSOR SYSTEM

SPECIAL TOOLS

M1540701900147

REVERSING SENSOR SYSTEM

CHASSIS ELECTRICAL

54A-223

Tool

Number

Name

Use

MB991955

a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826

M.U.T.-III sub-
assembly

a. Vehicle 

communication 
interface 
(V.C.I.)

b. M.U.T.-III USB 

cable

c. M.U.T.-III main 

harness A (for 
vehicles with 
CAN 
communication
)

d. M.U.T.-III main 

harness B (for 
vehicles 
without CAN 
communication
)

e. Measuring 

adapter 
harness

f. M.U.T.-III 

trigger harness

CAUTION

For vehicles with CAN 
communication, use M.U.T.-III 
main harness A to send the 
simulated vehicle speed. If you 
connect M.U.T.-III main harness B 
instead, CAN communication 
does not function correctly.
M.U.T.-III diagnosis code display

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Check harness
b. LED harness
c. LED harness 

adapter

d. Probe

Continuity check and voltage 
measurement at harness wire or 
connector

a. For checking connector pin 

contact pressure

b. For checking power supply circuit
c. For checking power supply circuit
d. For connecting a locally sourced 

tester

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

a

b

c

d

e

f

DO NOT USE

MB991223

a

d

c

b

DO NOT USE

BA

REVERSING SENSOR SYSTEM

CHASSIS ELECTRICAL

54A-224

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING

M1540700600079

Refer to GROUP 00 

− Contents of troubleshooting .

DIAGNOSIS FUNCTION

M1540700500038

FAIL-SAFE FUNCTION

1. When the ultrasonic noise is received, the bass 

toned buzzer sound continuously. When the ultra-
sonic noise stops, the normal operation will be 
resumed immediately.

2. When the abnormality such as the open circuit of 

a sensor occurs, the sensor turns OFF and the 
high toned buzzer sounds for 5 seconds. When 
the normal signal is received, the normal state 
will be resumed.

3. When an abnormality occurs in the sensor, the 

reversing sensor indicator keeps flashing with 
0.8-second interval until the system returns to the 
normal condition. However, if the system is 
turned OFF by using the switch, the indicator 
stops its flashing.

DIAGNOSIS CODE CHART

M1544300700014

CAUTION

During diagnosis, a diagnosis code associated 
with other system may be set when the ignition 
switch is turned on with connector(s) discon-
nected. On completion, confirm all systems for 
diagnosis code(s). If diagnosis code(s) are set, 
erase them all.

NOTE: With the troubleshooting indicated with "

*

", 

the ON/OFF switch indicator or buzzer sound will not 
be activated.

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Number

Name

Use

MB992006

Diagnosis code No.

Diagnosis item

Reference page

B252E

Rear corner sensor (RH) wire disconnection

B2530

Rear corner sensor (LH) wire disconnection

B2532

Back sensor (RH) wire disconnection

B2534

Back sensor (LH) wire disconnection

B252F

Rear corner sensor (RH) error

B2531

Rear corner sensor (LH) error

B2533

Back sensor (RH) error

B2535

Back sensor (LH) error

U0001

Bus off (CAN-C)

U0100

*

Engine-ECU CAN timeout

U0121

*

ASC/ABS-ECU CAN timeout

U0141

*

ETACS-ECU CAN timeout

REVERSING SENSOR SYSTEM

CHASSIS ELECTRICAL

54A-225

DIAGNOSIS CODE PROCEDURES

Code No. B252E Rear corner sensor (RH) wire disconnection

 

Code No. B2530 Rear corner sensor (LH) wire disconnection

 

Code No. B2532 Back sensor (RH) wire disconnection

 

Code No. B2534 Back sensor (LH) wire disconnection

CAUTION

Before replacing the ECU or sensor, ensure that the power supply circuit, the earth circuit and the 
communication circuit are normal.

Corner Sensor/Back Sensor Circuit

CORNER SENSOR/
BACK SENSOR-ECU

REAR CORNER 
SENSOR (LH)

REAR CORNER 
SENSOR (RH)

BACK SENSOR 
(LH)

BACK SENSOR 
(RH)

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

INTERFACE CIRCUIT