Mitsubishi Grandis. Manual — part 629

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-614

TROUBLE JUDGMENT

If the MUT-III can not received signal from the
steering wheel angle sensor, CAN bus line
connector(s) are broken or an open circuit has
occurred.

COMMENTS ON TROUBLE SYMPTOM

The CAN bus line wiring harness wire or connectors
may have loose, corroded, or damaged terminals, or
terminals pushed back in the connector, or the
steering wheel angle sensor may be defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the steering wheel angle sensor

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-09 joint connector
(CAN2) connector and C-306 steering wheel
angle sensor connector

CAUTION

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

P.54D-8

.

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

Q: Are the check result normal?

YES :

Go to Step 2 .

NO :

Repair a defective connector or replace the
joint connector.

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310183

AF

Connector: C-306 <RHD>

Harness side

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AB

Short pin

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-615

STEP 2. Resistance measurement at C-09 joint
connector (CAN2) and C-306 steering wheel
angle sensor connector.

CAUTION

A digital multimeter should be used. For details
refer to

P.54D-8

.

CAUTION

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

P.54D-8

.

(1) Disconnect the joint connector (CAN2) and the

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

(2) Ignition switch: OFF (LOCK)

CAUTION

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

P.54D-8

.

(3) Ensure that the negative battery terminal is

disconnected.

(4) Continuity between C-09 joint connector (CAN2)

terminal No.3 and C-306 steering wheel angle
sensor connector terminal No.3

OK: 2 ohms or less

(5) Continuity between C-09 joint connector (CAN2)

terminal No.14 and C-306 steering wheel angle

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310183

AF

Connector: C-306 <RHD>

Harness side

AC204582

Harness side: C-09

EH

Harness side: C-306

Test
harness

Test
harness

AC204582

Harness side: C-09

EG

Harness side: C-306

Test
harness

Test
harness

ENGINE COMPARTMENT RELAY BOX DISASSEMBLY AND REASSEMBLY

CONTROLLER AREA NETWORK (CAN)

54D-616

sensor connector terminal No.4

OK: 2 ohms or less

CAUTION

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

P.54D-8

.

Q: Are the check result normal?

YES :

<All the resistances measure 2

Ω or less>

Power supply to the steering wheel angle
sensor may be suspected. Diagnose the
ASC system. Refer to

P.35C-135

.

NO :

<Either or all of the voltages measure more
than 2

Ω> Repair the wiring harness

between the joint connector (CAN2) and the
steering wheel angle sensor connector.

ENGINE COMPARTMENT RELAY BOX DISASSEMBLY AND

REASSEMBLY

M1548304400028

AC303074

AC302571

1

2

4

8

7

6

5

3

: CLIP POSITIONS FOR COMPONENTS 3 AND 6

: CLIP POSITIONS FOR COMPONENTS
7 AND 8

Disassembly steps

1.

Relay box cover

2.

Connector

3.

Relay box

4.

Terminal

5.

Connector

6.

Relay box assembly

7.

Relay box body

8.

Relay box under cover

Disassembly steps (Continued)

CAN COMMUNICATION SIGNAL TABLE

CONTROLLER AREA NETWORK (CAN)

54D-617

CAN COMMUNICATION SIGNAL TABLE

M1548300400071

SIGNAL

TRANSMI
TTER
ECU

RECEIVER ECU
POWER
TRAIN
CONTROL
MODULE

ABS or
ABS/T
CL-EC
U

ASC-E
CU

MULTI-C
ENTRE
DISPLAY
UNIT
(MIDDLE-
GRADE
TYPE)

COMBIN
ATION
METER

A/C-EC
U

ETACS-
ECU

Engine speed signal Power

train
control
module

−

−

×

−

×

×

−

A/C information
signal

−

−

−

−

−

×

−

Vehicle speed signal

−

−

−

−

×

×

−

Vehicle stop signal

−

−

−

−

×

×

×

Malfunction indicator
lamp request signal

−

−

−

−

×

−

−

Auto-cruise control
indicator lamp signal

−

−

−

−

×

−

−

Engine coolant
temperature signal

−

−

−

−

×

×

−

Selector position
signal

−

−

−

−

×

−

×

Ignition switch (IG1)
signal

−

−

×

−

−

−

−

Shift change
permission signal

−

−

×

−

−

−

−

Shift change
inhibition signal

−

−

×

−

−

−

−

ABS warning light
request signal

ABS-ECU −

−

−

−

×

−

−

Indicator lamp
request signal

ABS or
ABS/TCL-
ECU

−

−

−

−

×

−

−

Indicator lamp
request signal

ASC-ECU −

−

−

−

×

−

−

Communication
continuation request
signal

Multi
centre
display
unit
(middle-gr
ade type)

−

−

−

−

−

−

×

Ignition switch
(ACC) signal

−

−

−

−

−

−

×