Mitsubishi Grandis. Manual - part 624

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-594

Diagnostic Item 31: Diagnose the lines from the main bus line to the ETACS-ECU <RH drive vehicles>

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.

TROUBLE JUDGMENT

If the MUT-III can not received signal from the 
ETACS-ECU, CAN bus line connector(s) are broken 
or an open circuit has occurred.

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 the ETACS-ECU 
may be defective.

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

COMBINATION
METER

ETACS-
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-595

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-09 joint connector 
(CAN2) connector and C-221 ETACS-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

.

When checking the joint connector, ensure that its 
wiring harness side and its short pins are not 
damaged.

Q: Are the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair a defective connector or replace the 
joint connector.

STEP 2. Resistance measurement at C-09 joint 
connector (CAN2) and C-221 ETACS-ECU 
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 joint connector (CAN2) and the 

ETACS-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 

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310620

Connector: C-221

Junction block 
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(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

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310620

Connector: C-221

Junction block 
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-596

disconnected.

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

terminal No.5 and C-221 ETACS-ECU connector 

terminal No.72

OK: 2 ohms or less

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

terminal No.16 and C-221 ETACS-ECU 
connector terminal No.73

OK: 2 ohms or less

CAUTION

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

P.54D-8

.

Q: Are the check result normal?

YES : 

<All the resistances measure 2 

Ω or less> 

Power supply to the ETACS-ECU may be 
suspected. Diagnose the SWS. Refer to 

P.54B-87

.

NO : 

<Either or all of the voltages measure more 
than 2 

Ω> Repair the wiring harness 

between the joint connector (CAN2) and the 
ETACS-ECU connector.

AC312553 BF

Harness side: C-09

Test
harness

Harness side: C-221

Test
harness

AC312553

Harness side: C-09

Harness side: C-221

Test
harness

BH

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-597

Diagnostic Item 32: Diagnose the lines from the main bus line to the A/C-ECU <LH drive vehicles>

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.

TROUBLE JUDGMENT

If the MUT-III can not received signals from the 
A/C-ECU, CAN bus line connector(s) are broken or 
an open circuit has occurred.

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 the A/C-ECU may 
be defective.

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

COMBINATION
METER

A/C-
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