Mitsubishi Grandis. Manual - part 503

 

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Mitsubishi Grandis. Manual - part 503

 

 

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-110

Diagnostic Item 3: Diagnose the CAN bus lines for short to power supply <RH drive vehicles without 
ASC>

CAUTION

When servicing a CAN bus line, earth yourself by 
touching a metal object such as an unpainted 
water pipe. If you fail to do, a component 
connected to the CAN bus line may be broken.

A/C-ECU

CENTER DISPLAY

COMBINATION
METER

DIAGNOSIS
CONNECTOR

ABS-ECU

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

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-111

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 ABS-ECU

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

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

ETACS-ECU

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-112

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

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

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

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

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-113

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 19, Diagnose CAN 

bus lines thoroughly. Refer to 

P.54D-502

.

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 28 .

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>

 

 

 

 

 

 

 

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