Mitsubishi Grandis. Manual - part 599

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-494

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 

AC310403

AC

Connector: A-16 <LHD>

A-16 (B)

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

AC312553

Harness side: C-112

Test
harness

AS

Male side: A-16

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-495

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

AC310401

Connector: A-04 <LHD>

Harness side

AL

A-04

AC310401

Connector: A-04 <LHD>

Harness side

AL

A-04

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

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-496

YES : 

<MUT-III indications correspond to the 

illustration> Go to Step 32  .

NO : 

<MUT-III indications do not correspond to 
the illustration> Go to Step 33 .

STEP 32. Resistance measurement at A-07 joint 
connector (CAN1) and A-04 ASC-ECU connector.
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 

ASC-ECU 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-07 joint connector (CAN1) 

terminal No.2 and A-04 ASC-ECU connector 
terminal No.15

OK: 2 

Ω or less

(5) Continuity between A-07 joint connector (CAN1) 

terminal No.5 and A-04 ASC-ECU connector 

AC302572AD

Connector: A-07

Harness side

AC310401

Connector: A-04 <LHD>

Harness side

AL

A-04

AC312553

Harness side: A-07

Test
harness

Test
harness

Harness side: A-04

BU

AC312553

Harness side: A-07

Test
harness

Harness side: A-04

BV 

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-497

terminal No.11

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 ASC-ECU may be 
suspected. Diagnose the ASC system. 
Refer to 

P.35C-129

.

NO : 

<Either or all of the resistances measure 
more than 2 

Ω> Repair the wiring harness 

between the joint connector (CAN1) and the 
ASC-ECU connector.

STEP 33. 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 is not damaged.

Q: Is the check result normal?

YES : 

Go to Step 34 .

NO : 

Repair a defective connector or replace the 
joint connector.

STEP 34. 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 35 .

NO : 

Repair the defective connector.

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

AC310613

AD

Connector: C-125 <LHD>