Mitsubishi Colt Ralliart. Manual - part 435

MB991006

SPECIAL TOOLS

POWER STEERING

37-7

MB990228 or 
MB991006

Preload socket

Steering gear total pinion torque check 
and adjustment

MB990803

MB990803

Steering wheel 
puller

Steering wheel disconnection

Tool

Number

Name

Use

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-8

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1372007300257

Refer to GROUP 00 

− Contents of Troubleshooting 

P.00-5

 .

DIAGNOSTIC FUNCTION

M1372007400049

HOW TO READ DIAGNOSIS CODE

Connect the M.U.T.-III to the 16-pin diagnosis con-
nector, and read a diagnosis code (Refer to GROUP 
00, How to Use Troubleshooting/Inspection Service 
Points 

− Diagnosis Function 

P.00-7

).

How to erase diagnosis code

Connect the M.U.T.-III to the 16-pin diagnosis con-
nector, and erase a diagnosis code (Refer to 
GROUP 00, How to Use Troubleshooting/Inspection 
Service Points 

− Diagnosis Function 

P.00-7

).

CHECK OF ELECTRIC POWER 
STEERING WARNING LAMP

M1372013400101

AC510342

EPS warning lamp

AB

<VRX>

AC510343

EPS warning lamp

AC

<LS and VR>

AC601682

EPS warning lamp

AB

<RALLIART Version-R>

1. Check the electric power steering warning lamp 

illuminates as follows.

• When the ignition switch is turned ON, the elec-

tric power steering warning lamp illuminates until 
the engine is started. The lamp extinguishes after 
the engine is started.

NOTE: Even if the ignition switch is turned to the ON 

position (within approximately 0.3 seconds) again 
immediately after it is turned to the LOCK (OFF) 
position, the electric power steering warning lamp 
does not illuminate.

2. If the lamp does not operate as described above, 

the electric power steering system or the 
combination meter may be defective. Check for 
diagnosis code, and carry out diagnosis (Refer to 

P.37-9

). If no diagnosis codes are set, carry out 

diagnosis by referring to the electric power 
steering warning lamp-related inspection items on 
the trouble symptom chart (Refer to 

P.37-71

).

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-9

DIAGNOSIS CODE CHART

M1372007500046

CAUTION

• During diagnosis, a diagnosis code associ-

ated with other system may be set when the 
ignition switch is turned on with connector(s) 
disconnected. On completion, confirm all sys-
tems for diagnosis code(s). If diagnosis 
code(s) are set, erase them all.

•

Diagnosis 
code No.

Diagnostic item

Reference pages or actions

C1511

Torque sensor main system malfunction

P.37-10

C1512

Torque sensor sub system malfunction

C1513

Large difference between main torque sensor and 
sub torque sensor

P.37-19

C1514

Torque sensor power supply abnormality

P.37-25

C1521

Vehicle speed sensor input malfunction

P.37-29

C1522

Engine speed input malfunction

P.37-33

C1531

Motor terminal voltage abnormality

P.37-36

C1532

Over real current of motor

P.37-39

C1533

Motor current sensor problem

Replace the electric power 
steering-ECU (Refer to 

P.37-102

).

C1534

Under real current of motor

P.37-41

C1541

Fail-safe relay is stuck to ON.

Replace the electric power 
steering-ECU (Refer to 

P.37-102

).

C1542

Fail-safe relay stuck off.

P.37-44

C1607

Abnormal ECU (microcomputer)

Replace the electric power 
steering-ECU (Refer to 

P.37-102

).

C1860

Power supply voltage abnormality (high voltage)

P.37-48

C1861

Power supply voltage abnormality (low voltage)

P.37-50

U1073

Bus off

P.37-53

U1100

Engine-related time-out

P.37-55

U1102

CAN communication time-out with ABS-ECU

P.37-59

U1120

Engine-related failure information

P.37-63

U1122

ABS-ECU failure information

P.37-67

If more than three minutes elapse after the 
ignition switch is turned ON without starting 
engine, the electric power steering-ECU may 
set diagnosis codes U1100 and U1102 as past 
trouble.

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-10

DIAGNOSTIC TROUBLE CODE 
PROCEDURES

Code No.C1511: Torque sensor main system malfunction

 

Code No.C1512: Torque sensor sub system malfunction

CAUTION

Whenever the ECU is replaced, ensure that the communication circuit is normal.

ELECTRIC POWER STEERING-ECU

TORQUE SENSOR

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

Torque Sensor Circuit

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes are set in the following case:

C1511: Torque sensor main system malfunction

• The torque sensor main output voltage does not 

meet a predetermined voltage stored in the 
microcomputer, and the microcomputer deter-
mines that there is a problem in the torque sensor 
main system.
Criteria for judging malfunction

• The torque sensor main output voltage is 

more than 4.5 V or less than 0.5 V.

C1512: Torque sensor sub system malfunction

• The torque sensor sub output voltage does not 

meet a predetermined voltage stored in the 
microcomputer, and the microcomputer deter-
mines that there is a problem in the torque sensor 
sub system.
Criteria for judging malfunction

• The torque sensor sub output voltage is more 

than 4.5 V or less than 0.5 V.

Main

Index

Group

TOC