Mitsubishi Grandis. Manual — part 615
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-558
COMMENTS ON TROUBLE SYMPTOM
The CAN bus line wire or connectors may have
loose, corroded, or damage terminals, or terminals
pushed back in the connector.
POSSIBLE CAUSES
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
STEP 1. Connector check: C-09 joint connector
(CAN2) and C-125 intermediate connector
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 is not damaged.
Q: Are the check results 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-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 joint connector (CAN2) 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
(3) Ensure that the negative battery terminal is
AC310628AY
Connector: C-09 <RHD>
C-09 (GR)
Harness side
AC310628AB
Connector: C-125 <RHD>
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
AC310628AY
Connector: C-09 <RHD>
C-09 (GR)
Harness side
AC310628AB
Connector: C-125 <RHD>
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-559
disconnected.
(4) Continuity between C-125 intermediate
connector terminal No.26 and C-09 joint
connector (CAN2) terminal No.11
OK: 2
Ω or less
(5) Continuity between C-125 intermediate
connector terminal No.27 and C-09 joint
connector (CAN2) terminal No.22
OK: 2
Ω or less
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to
Q: Are the check results normal?
YES :
<All the voltages measure 2
Ω or less> Go
to Step 3 .
NO :
<Either or all of the resistances measure
more than 2
Ω> Repair the wiring harness
between joint connector (CAN2) and the
intermediate connector.
STEP 3. Connector check: A-07 joint connector
(CAN1)
NOTE: When checking A-07 joint connector (CAN1),
disassemble and check the engine compartment
relay box by referring to
.
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 is not damaged.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair a defective connector or replace the
joint connector (front wiring harness
assembly).
AC312553
AC312553 AN
Harness side: C-09
Test
harness
Female side: C-125
Test harness
AC312553
AC312553 AP
Harness side: C-09
Test
harness
Female side: C-125
Test harness
AC302572AD
Connector: A-07
Harness side
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-560
STEP 4. Resistance measurement at C-125
intermediate connector and A-07 joint connector
(CAN1).
NOTE: When checking A-07 joint connector (CAN1),
disassemble and check the engine compartment
relay box by referring to
.
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 joint connector (CAN1) 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
(3) Ensure that the negative battery terminal is
disconnected.
(4) Continuity between A-07 joint connector (CAN1)
terminal No.1 and C-125 intermediate connector
terminal No.27
OK: 2
Ω or less
(5) Continuity between A-07 joint connector (CAN1)
terminal No.4 and C-125 intermediate connector
AC302572AD
Connector: A-07
Harness side
AC310628AB
Connector: C-125 <RHD>
AC312553
Male side: C-125
Test harness
AV
Harness side: A-07
Test
harness
AC312553 AU
Male side: C-125
Test harness
Harness side: A-07
Test
harness
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-561
terminal No.26
OK: 2
Ω or less
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to
Q: Are the check results normal?
YES :
<All the resistances measure 2
Ω or less>
Follow diagnostic item 23 "Diagnose the
lines from the main bus line to the
engine-ECU <M/T> or engine-A/T-ECU
<A/T>" (Refer to
), diagnostic
item 24 "Diagnose the lines between CAN
main bus line and the ABS-ECU (Refer to
), or diagnostic item 25
"Diagnose the lines between CAN main bus
line and the ASC-ECU" (Refer to
).
NO :
<Either or all of the resistances measure
more than 2
Ω> Repair the wiring harness
between joint connector (CAN1) and the
intermediate connector.
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