Mitsubishi Grandis. Manual — part 495

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-78

TROUBLE JUDGMENT

Short to power supply may be present when the
voltage between the CAN bus line (CAN_L or
CAN_H) and body earth is more than 4.0 V. In this
condition, an abnormal voltage may be measured at
CAN_L and CAN_H lines.

COMMENTS ON TROUBLE SYMPTOM

The wiring harness wire or connectors may have
loose, corroded, or damage terminals, or terminals
pushed back in the connector, or a ECU may be
defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

• Malfunction of the combination meter

• Malfunction of the A/C-ECU

• Malfunction of the SRS-ECU

• Malfunction of the multi-centre display

• Malfunction of the steering wheel angle sensor

• Malfunction of the ASC-ECU

• Malfunction of the engine-ECU <M/T> or

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

ETACS-ECU

STEERING WHEEL
ANGLE SENSOR

SRS-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 : Gray R : Red P : Pink V : Violet

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-79

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-112 engine-ECU
<M/T> or engine-A/T-ECU <A/T> connector, C-02
combination meter connector and C-126
diagnosis 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: Are the check result normal?

YES :

Go to Step 2 .

NO :

Repair the defective connector.

STEP 2. Voltage 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) Disconnect the engine-ECU <M/T> or

engine-A/T-ECU <A/T> connector and the
combination meter connector, and measure at
the wiring harness side.

(2) Connect the negative battery terminal, and turn

AC310615

AS

Harness side

Connector: C-112 <LHD>

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

AC310614

BJ

Connectors: C-02, C-126
<LHD>

C-02

C-126 (B)

C-126 Harness side

C-02 Harness side

AC310615

AS

Harness side

Connector: C-112 <LHD>

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

AC310614

BJ

Connectors: C-02, C-126
<LHD>

C-02

C-126 (B)

C-126 Harness side

C-02 Harness side

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-80

the ignition switch to the ON position.

(3) Voltage between C-126 diagnosis connector

terminal No.14 and body earth

OK: 4.0 V or less

(4) Voltage between C-126 diagnosis connector

terminal No.6 and body earth

OK: 4.0 V or less

(5) Disconnect the negative battery terminal.

Q: Are the check result normal?

YES <all of the measurement results show 4.0 V or
less> :

Diagnostic Item 18: Diagnose CAN bus

lines thoroughly. Refer to

P.54D-476

.

NO <The voltage between terminal No.14 and body
earth is more than 4.0 V> :

Go to Step 3 .

NO <The voltage between terminal No.6 and body
earth is more than 4.0 V> :

Go to Step 30 .

STEP 3. Connector check: C-125 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 4 .

NO :

Repair the defective connector.

STEP 4. Voltage measurement at the C-125
intermediate 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 connector, and measure at its

male-side intermediate connector (at the front
wiring harness side).

(2) Connect the negative battery terminal, and turn

AC209365JP

8

16

15

7

5

13 14

6

12

4

2

10 11

3

9

1

Harness side: C-126
(Front side)

Test
Harness

AC209365

Harness side: C-126
(Front side)

Test
harness

JO

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

AC310613

AD

Connector: C-125 <LHD>

AC310613

AD

Connector: C-125 <LHD>

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-81

the ignition switch to the ON position.

(3) Voltage between C-125 intermediate connector

terminal No.27 and body earth

OK: 4.0 V or less

Q: Is the check result normal?

YES :

<4.0 V or less> Go to Step 5.

NO :

<more than 4.0 V> Go to Step 22.

STEP 5. Connector check: C-09 joint connector
(CAN2)

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: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair a defective connector or replace the
joint connector.

STEP 6. Voltage measurement at C-09 joint
connector (CAN2).

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 connector, and measure at the

wiring harness side.

(2) Connect the negative battery terminal, and turn

the ignition switch to the ON position.

(3) Voltage between C-09 joint connector (CAN2)

terminal No.18 and body earth

OK: 4.0 V or less

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

AC209365JQ

Male side: C-125

Test harness

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

AB

Short pin

AC310615

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

AC209365JR

Harness side: C-09

Test
harness

AC209365JW

Harness side: C-09

Test
harness