Mitsubishi Grandis. Manual — part 611

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-542

STEP 25. Connector check: C-112 engine-ECU
<M/T> or engine-A/T-ECU <A/T> 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 26 .

NO :

Repair the defective connector.

STEP 26. MUT-III CAN bus diagnostics (C-112
engine-ECU <M/T> or engine-A/T-ECU <A/T>
connector disconnected)

(1) Disconnect the engine-ECU <M/T> or

engine-A/T-ECU <A/T> 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 27 .

NO :

<MUT-III indications do not correspond to
the illustration> Go to Step 30 .

STEP 27. Connector check: A-16 intermediate
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 28 .

NO :

Repair the defective connector.

AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

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

AI

: Red section

on screen

AC310398

AC

Connector: A-16 <RHD>

A-16 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-543

STEP 28. Resistance measurement at A-16
intermediate connector and 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

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 (CAN1) and the

intermediate 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 A-16 intermediate connector

terminal No.6 and A-07 joint connector (CAN1)
terminal No.6

OK: 2

Ω or less

(5) Continuity between A-16 intermediate connector

terminal No.12 and A-07 joint connector (CAN1)

AC302572AD

Connector: A-07

Harness side

AC310398

AC

Connector: A-16 <RHD>

A-16 (B)

AC312553

AC312553 AR

Harness side: A-07

Female side: A-16

Test
harness

Test
harness

AC312553

AC312553

Test harness

AQ

Harness side: A-07

Female side: A-16

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-544

terminal No.3

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 voltages measure 2

Ω or less> Go

to Step 29 .

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between joint connector (CAN1) and the
intermediate connector.

STEP 29. Resistance measurement at A-16
intermediate connector and C-112 engine-ECU
<M/T> or engine-A/T-ECU <A/T> 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 engine-ECU <M/T> or

engine-A/T-ECU <A/T> connector and the
intermediate 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 A-16 intermediate connector

terminal No.6 and C-112 engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector terminal

AC310398

AC

Connector: A-16 <RHD>

A-16 (B)

AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

AC312553

Harness side: C-112

Test
harness

AS

Male side: A-16

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-545

No.61.

OK: 2

Ω or less

(5) Continuity between A-16 intermediate connector

terminal No.12 and C-112 engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector terminal
No.62.

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 engine-ECU <M/T> or
engine-A/T-ECU <A/T> may be suspected.
Diagnose the engine control system. Refer
to

P.13A-321

.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between the engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector and the
joint connector (CAN1).

STEP 30. Connector check: A-04 ASC-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 31 .

NO :

Repair the defective connector.

STEP 31. MUT-III CAN bus diagnostics (A-04
ASC-ECU connector disconnected)

(1) Disconnect the ASC-ECU 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?

AC312553

Harness side: C-112

Test
harness

AT

Test
harness

Male side: A-16

AC310398

AJ

Connector: A-04 <RHD>

A-04

Harness side

AC310398

AJ

Connector: A-04 <RHD>

A-04

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

AF

: Red section

on screen