Mitsubishi Colt Ralliart. Manual — part 313

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-81

Diagnostic Item 12: Diagnose when the M.U.T.-III cannot receive the data sent by steering wheel
sensor.

CAUTION

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

STEERING
WHEEL
SENSOR

COMBINATION
METER

ENGINE-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 : Grey R : Red P : Pink V : Violet PU : Purple

FUNCTION

The diagnostic result demonstrates that "Diagnose
when the M.U.T.-III cannot receive the data sent by
steering wheel sensor" when the M.U.T.-III checks
the periodically sent data from each ECU and cannot
receive the steering wheel sensor data only.

TROUBLE JUDGEMENT CONDITIONS

M.U.T.-III judges the trouble when the periodically
sent data from steering wheel sensor cannot be
received and sent.

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-82

PROBABLE CAUSES

• Damaged harness wires and connectors

• Power supply circuit malfunction of the steering

wheel sensor

• Malfunction of the steering wheel sensor

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-03 joint connector
(CAN1) and B-142 steering wheel sensor
connector

AC313820

Connector: B-03

AE

AC601077AB

Connector: B-142

Harness side

CAUTION

The strand end of the twist wire should be within
10 cm from the connector. For details refer to

P.54D-5

.

When checking the joint connector, ensure that its
wiring harness side and its short pins are not dam-
aged.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector. Replace the
joint connector as necessary.

STEP 2. Resistance measurement at B-03 joint
connector (CAN1) and B-142 steering wheel
sensor connector.

CAUTION

A digital multimeter should be used. For details
refer to

P.54D-5

.

CAUTION

The test wiring harness should be used. For
details refer to

P.54D-5

.

AC313820

Connector: B-03

AE

AC601077AB

Connector: B-142

Harness side

(1) Disconnect the joint connector (CAN1) and the

steering wheel sensor connector, and measure at
the wiring harness side.

(2) Turn the ignition switch to the OFF (LOCK)

position.

CAUTION

When measuring the resistance, disconnect the
negative battery terminal. For details refer to

P.54D-5

.

(3) Ensure that the negative battery terminal is

disconnected.

Main

Index

Group

TOC

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740JE

Harness side: B-142

Harness side: B-03

Test
harness

Test
harness

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-83

(4) Continuity between B-03 joint connector (CAN1)

terminal No.6 and B-142 steering wheel sensor
connector terminal No.6

OK: Continuity (2

Ω or less)

AC204740JF

Harness side: B-142

Harness side: B-03

Test
harness

Test
harness

(5) Continuity between B-03 joint connector (CAN1)

terminal No.12 and B-142 steering wheel sensor
connector terminal No.4

OK: Continuity (2

Ω or less)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to

P.54D-5

.

Q: Is the check result normal?

YES :

<All the resistances measure 2

Ω or less>

Power supply to the steering wheel sensor
may be suspected. Diagnose the ASC
system. Refer to GROUP 35C

−

Troubleshooting

P.35C-102

.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between joint connector (CAN1) and the
steering wheel sensor connector.

Main

Index

Group

TOC

CAN COMMUNICATION-RELATED DIAGNOSIS CODE (U CODE) TABLE

CONTROLLER AREA NETWORK (CAN)

54D-84

CAN COMMUNICATION-RELATED DIAGNOSIS CODE

(U CODE) TABLE

M1548300300450

Output
ECU

Code No. Diagnostic item

Action

Engine-E
CU
<M/T> or
engine-C
VT-ECU
<CVT>

U1073

Bus Off

CAN main bus line diagnosis

U1102

ABS-ECU <vehicles without ASC> or
ASC-ECU <vehicles with ASC> time-out

U1106

EPS-ECU time-out

U1108

Meter-A/C-ECU time-out (related to
meter)

U1110

Meter-A/C-ECU time-out (related to A/C)

ABS-EC
U
<vehicle
s without
ASC>

U1073

Bus Off

CAN main bus line diagnosis

ASC-EC
U
<vehicle
s with
ASC>

U1073

Bus Off

CAN main bus line diagnosis

U1100

engine-ECU <M/T> or engine-CVT-ECU
<CVT> time-out (related to engine)

U1104

Steering wheel sensor time-out

U1105

G and yaw rate sensor time-out

EPS-EC
U

U1073

Bus Off

CAN main bus line diagnosis

U1100

engine-ECU <M/T> or engine-CVT-ECU
<CVT> time-out (related to engine)

U1102

ABS-ECU <vehicles without ASC> or
ASC-ECU <vehicles with ASC> time-out

U1120

Failure information on engine-ECU <M/T>
or engine-CVT-ECU <CVT> (related to
engine)

Diagnose CAN main bus lines and
confirm input signals.

U1122

Failure information on ABS-ECU
<vehicles without ASC> or ASC-ECU
<vehicles with ASC>

Meter-A/
C-ECU

U1073

Bus Off

CAN main bus line diagnosis

U1100

engine-ECU <M/T> or engine-CVT-ECU
<CVT> time-out (related to engine)

U1101

engine-ECU <M/T> or engine-CVT-ECU
<CVT> time-out (related to CVT)

U1102

ABS-ECU <vehicles without ASC> or
ASC-ECU <vehicles with ASC> time-out

U1106

EPS-ECU time-out

U1109

ETACS-ECU time-out

U1120

Failure information on engine-ECU <M/T>
or engine-CVT-ECU <CVT> (related to
engine)

Diagnose CAN main bus lines and
confirm input signals.

Main

Index

Group

TOC