Mitsubishi Grandis. Manual — part 535

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-238

disconnected.

(3) Resistance between A-07 joint connector (CAN1)

terminal No.4 and body earth

OK: 1 k

Ω or more

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to

P.54D-8

.

Q: Is the check result normal?

YES :

<1 k

Ω or more> Follow diagnostic item 18,

Diagnose CAN bus lines thoroughly. Refer
to

P.54D-476

.

NO :

<less than 1 k

Ω> Repair the wiring harness

between the joint connector (CAN1) and the
intermediate connector.

AC209364

Harness side: A-07

AC209364MC

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-239

Diagnostic Item 7: Diagnose the CAN bus lines for short to earth <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-240

TROUBLE JUDGMENT

The CAN bus line has been shorted to earth if the
voltage between the CAN bus line (CAN_L or
CAN_H) and body earth is less than 1.0 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-241

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. Resistance 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.

CAUTION

When measuring the resistance, disconnect the
negative battery terminal. For details refer to

P.54D-8

.

(2) Ensure that the negative battery terminal is

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