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
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
.
CAUTION
The test wiring harness should be used. For
details refer to
(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-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
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
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
.
CAUTION
The test wiring harness should be used. For
details refer to
(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
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
.
CAUTION
The test wiring harness should be used. For
details refer to
(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
7
18
8
19
9
20
10
21
11
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
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