Mitsubishi Grandis. Manual — part 607
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-526
Diagnostic Item 20: Diagnose CAN bus lines thoroughly <RH drive vehicles with 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
ASC-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-527
TROUBLE JUDGMENT
If the MUT-III can not received signals from ECUs,
CAN bus line connector(s) are broken or an open
circuit has occurred.
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
• 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 steering wheel angle sensor
• Malfunction of the ASC-ECU
• Malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T>
DIAGNOSTIC PROCEDURE
STEP 1. Connector check: 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: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair the defective connector.
ETACS-ECU
STEERING WHEEL
ANGLE SENSOR
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
AC310631AK
Connector: C-126 <RHD>
C-126 (B)
Harness side
(Front side)
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-528
STEP 2. Resistance 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) Measure at the diagnosis connector 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 C-126 diagnosis connector
terminal Nos. 6 and 14
Q: How much resistance is measured?
2
Ω or less :
Diagnose the lines between the
CAN_L and H for short circuit. Refer to
.
No continuity :
Diagnose the terminator resistors
at both ends. Refer to
More than 2
Ω (i.e. continuity exists) :
Go to Step 3
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).
STEP 4. MUT-III CAN bus diagnostics (A-07 joint
connector (CAN1)
(1) Disconnect the joint connector (CAN1), and
AC310631AK
Connector: C-126 <RHD>
C-126 (B)
Harness side
(Front side)
AC311938 CC
Front side : C-126
Test
harness
Test
harness
AC302572AD
Connector: A-07
Harness side
AC302572AD
Connector: A-07
Harness side
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54D-529
check by using the MUT-III.
(2) Check that the MUT-III indications correspond to
the illustration.
Q: Is the check result normal?
YES :
<MUT-III indications correspond to the
illustration> Go to Step 25 .
NO :
<MUT-III indications do not correspond to
the illustration> Go to Step 5 .
STEP 5. Connector check: C-09 joint connector
(CAN2) and C-02 combination meter 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: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair a defective connector or replace the
joint connector.
AC309834
MUT
J/C (2)
METER
ETAC S
J/C (1)
ASC -ECU
ENG/AT-ECU
A/C -ECU
SRS-ECU
STR. A .
SNSR
C. DISPL AY
AE
: Red section
on screen
AC310631AX
Connector: C-02 <RHD>
Harness side
C-02
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
AC
Short pin
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