Mitsubishi Grandis. Manual — part 595

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-478

STEP 2. Resistance measurement at the C-126
diagnosis 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) Measure at the diagnosis connector 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-126 diagnosis connector

terminal Nos. 6 and 14

Q: How much resistance is measured?

2

Ω or less :

Diagnose the lines between the

CAN_L and H for short circuit. Refer to

P.54D-328

.

No continuity :

Diagnose the terminator resistors

at both ends. Refer to

P.54D-404

.

More than 2

Ω (i.e. continuity exists) :

Go to Step 3

.

STEP 3. Connector check: A-07 joint connector
(CAN1)
NOTE: When checking A-07 joint connector (CAN1),
disassemble and check the engine compartment
relay box by referring to

P.54D-616

.

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 is not damaged.

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair a defective connector or replace the
joint connector (front wiring harness
assembly).

STEP 4. MUT-III CAN bus diagnostics [A-07 joint
connector (CAN1)]

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

AC310613

AO

Connector: C-126 <LHD>

Harness side
(Front side)

C-126 (B)

AC311938 CC

Front side : C-126

Test
harness

Test
harness

AC302572AD

Connector: A-07

Harness side

AC302572AD

Connector: A-07

Harness side

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-479

check by using the MUT-III.

(2) Check that the MUT-III indications correspond to

the illustration.

Q: Is the check result normal?

YES :

<MUT-III indications correspond to the

illustration> Go to Step 25 .

NO :

<MUT-III indications do not correspond to
the illustration> Go to Step 5 .

STEP 5. Connector check: C-09 joint connector
(CAN2) and C-02 combination meter 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 is not damaged.

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair a defective connector or replace the
joint connector.

AC309834

MUT

J/C (2)

METER

ETAC S

J/C (1)

ASC -ECU

ENG/AT-ECU

A/C -ECU

SRS-ECU

STR. A .

SNSR

C. DISPL AY

AE

: Red section

on screen

AC310613

BB

Connector: C-02 <LHD>

Harness side

AC310615

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AC

Short pin

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-480

STEP 6. MUT-III CAN bus diagnostics (C-02
combination meter connector disconnected)

(1) Disconnect the combination meter connector,

and diagnose by using the MUT-III.

(2) Check that the MUT-III indications correspond to

the illustration.

Q: Is the check result normal?

YES :

<MUT-III indications correspond to the

illustration> Go to Step 7 .

NO :

<MUT-III indications do not correspond to
the illustration> Go to Step 8 .

STEP 7. Resistance measurement at C-09 joint
connector (CAN2) and C-02 combination meter
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

combination meter 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

AC310613

BB

Connector: C-02 <LHD>

Harness side

AC309834

MUT

J/C (2)

METER

ETAC S

J/C (1)

ASC -ECU

ENG/AT-ECU

A/C -ECU

SRS-ECU

STR. A .

SNSR

C. DISPL AY

AD

: Red section

on screen

AC310613

BB

Connector: C-02 <LHD>

Harness side

AC310615

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-481

disconnected.

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

terminal No.7 and C-02 combination meter
connector terminal No.24

OK: 2

Ω or less

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

terminal No.18 and C-02 combination meter

connector terminal No.23

OK: 2

Ω or less

CAUTION

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

P.54D-8

.

Q: Are the check results normal?

YES :

<All the resistances measure 2

Ω or less>

Power supply to the combination meter may
be suspected. Diagnose the combination
meter. Refer to

P.54A-55

.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between joint connector (CAN2) and the
combination meter connector.

STEP 8. Connector check: C-106 A/C-ECU
connector

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair the defective connector.

STEP 9. MUT-III CAN bus diagnostics (C-106
A/C-ECU connector disconnected)

(1) Disconnect the A/C-ECU connector, and

AC312553 AI

Harness side: C-09

Test
harness

Harness side: C-02

Test
harness

AC312553 AK

Harness side: C-09

Harness side: C-02

Test
harness

Test
harness

AC310613

AB

Connector: C-106 <LHD>

Harness side

AC310613

AB

Connector: C-106 <LHD>

Harness side