Mitsubishi Grandis. Manual - part 511

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-142

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 

AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

61

62

63

64

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66

67

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69

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71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

AC310632BC

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

C-02

C-126 (B)

C-126 Harness side

C-02 Harness side

AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

61

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72

73

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89

AC310632BC

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

C-02

C-126 (B)

C-126 Harness side

C-02 Harness side

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-143

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> : 

Follow diagnostic item 20, Diagnose CAN 

bus lines thoroughly. Refer to 

P.54D-526

.

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

AC310628AB

Connector: C-125 <RHD>

AC310628AB

Connector: C-125 <RHD>

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-144

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.17 and body earth

OK: 4.0 V or less

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

AC209365JQ

Male side: C-125

Test harness

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

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18

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19

9

20

10

21

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22

AB

Short pin

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC209365JV

Harness side: C-09

Test
harness

AC209365KQ

Harness side: C-09

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-145

terminal No.19 and body earth

OK: 4.0 V or less

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

terminal No.16 and body earth

OK: 4.0 V or less

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

terminal No.20 and body earth

OK: 4.0 V or less

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

terminal No.15 and body earth

OK: 4.0 V or less

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

terminal No.14 and body earth

OK: 4.0 V or less

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

terminal No.18 and body earth

OK: 4.0 V or less

(10)Disconnect the negative battery terminal.

Q: Are the check result normal?

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

Go to Step 21 .

NO <The voltage between terminal No.17 and body 
earth is more than 4.0 V> : 

Go to Step 7 .

NO <The voltage between terminal No.19 and body 
earth is more than 4.0 V> : 

Go to Step 8 .

NO <The voltage between terminal No.16 and body 
earth is more than 4.0 V> : 

Go to Step 10 .

NO <The voltage between terminal No.20 and body 
earth is more than 4.0 V> : 

Go to Step 12 .

NO <The voltage between terminal No.15 and body 
earth is more than 4.0 V> : 

Go to Step 16 .

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

Go to Step 18 .

NO <The voltage between terminal No.18 and body 
earth is more than 4.0 V> : 

Go to Step 20 .

AC209365JT

Harness side: C-09

Test
harness

AC209365KS

Harness side: C-09

Test
harness

AC209365JX

Harness side: C-09

Test
harness

AC209365JS

Harness side: C-09

Test
harness

AC209365JR

Harness side: C-09

Test
harness