Mitsubishi L200. Manual — part 845
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-139
PROBABLE CAUSES
• Damaged harness wires and connectors
• Power supply circuit malfunction of the engine-
ECU
• Malfunction of the engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-01 joint connector
(CAN2) and C-103 engine-ECU connector
AC903853
BW
Connectors: C-01, C-103 <LHD>
C-01
Harness side
C-103
C-01 (L)
C-103 (B)
AC903865 AZ
Connectors: C-01, C-103 <RHD>
C-01 (L)
C-103 (B)
C-01
Harness side
C-103
CAUTION
The strand end of the twist wire should be within
10 cm from the connector. For details refer to
.
AC209350
1
12
2
13
3
14
4
15
5
16
6
17
7
18
8
19
9
20
10
21
11
22
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
When checking the joint connector, ensure that its
wiring harness side and its short pins are not dam-
aged.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector. Replace the
joint connector as necessary.
STEP 2. Resistance measurement at C-01 joint
connector (CAN2) and C-103 engine-ECU
connector.
CAUTION
A digital multimeter should be used. For details
refer to
CAUTION
The test wiring harness should be used. For
details refer to
.
AC903853
BW
Connectors: C-01, C-103 <LHD>
C-01
Harness side
C-103
C-01 (L)
C-103 (B)
AC903865 AZ
Connectors: C-01, C-103 <RHD>
C-01 (L)
C-103 (B)
C-01
Harness side
C-103
(1) Disconnect the joint connector (CAN2) and the
engine-ECU connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
.
(3) Ensure that the negative battery terminal is
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-140
disconnected.
AC204740
Harness side: C-01
Harness side: C-103
Test harness
Test
harness
NR
(4) Continuity between C-01 joint connector (CAN2)
terminal No.9 and C-103 engine-ECU connector
terminal No.108 <LHD>
OK: Continuity (2
Ω or less)
AC204740NS
Harness side: C-01
Harness side: C-103
Test harness
Test
harness
(5) Continuity between C-01 joint connector (CAN2)
terminal No.10 and C-103 engine-ECU connector
terminal No.108 <RHD>
OK: Continuity (2
Ω or less)
AC204740
AC204740
AC204740
AC204740
AC204740
AC204740
Harness side: C-01
NT
Test harness
Harness side: C-103
Test
harness
(6) Continuity between C-01 joint connector (CAN2)
terminal No.20 and C-103 engine-ECU connector
terminal No.109 <LHD>
OK: Continuity (2
Ω or less)
AC204740
AC204740
AC204740
AC204740
AC204740
AC204740
Harness side: C-01
NU
Test harness
Harness side: C-103
Test
harness
(7) Continuity between C-01 joint connector (CAN2)
terminal No.21 and C-103 engine-ECU connector
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-141
terminal No.109 <RHD>
OK: Continuity (2
Ω or less)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to
Q: Is the check result normal?
YES :
<All the resistances 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
engine-ECU connector.
STEP 3. Resistance measurement at C-103
engine-ECU connector.
CAUTION
A digital multimeter should be used. For details
refer to
AC903853
BV
Connector: C-103 <LHD>
C-103 (B)
Harness side
AC903865 AY
Connector: C-103 <RHD>
Harness side
C-103 (B)
(1) Remove the engine-ECU, and measure at the
equipment side.
AC204738SK
Equipment side: C-103
Test
harness
Test
harness
(2) Resistance between C-103 engine-ECU
connector terminal Nos.108 and 109
OK: 120
± 20 Ω
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to
Q: Is the check result normal?
YES :
<Within 120
± 20 Ω> Power supply to the
engine-ECU may be suspected. Diagnose
the fuel system. Refer to .
NO :
<Not within 120
± 20 Ω> Replace the
engine-ECU.
CAN COMMUNICATION-RELATED DIAGNOSIS CODE (U CODE) TABLE
CONTROLLER AREA NETWORK (CAN)
54C-142
CAN COMMUNICATION-RELATED DIAGNOSIS CODE (U
CODE) TABLE
M1548300302360
Code
No.
Diagnostic item
Output ECU
Action
U1073 Bus Off
Engine-ECU, A/T-ECU, ABS-ECU,
ASTC-ECU, ETACS-ECU
CAN main bus line
diagnostics
U1100 Engine-ECU time-out (related to
engine)
A/T-ECU, ASTC-ECU, ETACS-ECU
U1101 A/T-ECU time-out (related to
automatic transmission) <A/T>
Engine-ECU, ASTC-ECU, ETACS-
ECU
U1102 ASTC-ECU time-out
Engine-ECU, A/T-ECU
U1104 Steering wheel sensor timeout error
ASTC-ECU
U1105 G and yaw rate sensor timeout error
U1109 ETACS-ECU time-out
Engine-ECU, A/T-ECU, ASTC-ECU
U1110
A/C-ECU time-out
ETACS-ECU
U1111
RV meter time-out
U1117
Immobilizer-ECU time-out
Engine-ECU
U1120 Failure information of Engine-ECU
A/T-ECU, ASTC-ECU
Diagnose CAN main
bus lines and
confirm input signals.
U1150 Failure information of vehicles speed ETACS-ECU
U1190 The network system diagnosis code
output permitted signal cannot be
received.
Engine-ECU, A/T-ECU, ASTC-ECU
U1200 Steering wheel sensor
communication error
ASTC-ECU
U1201 Yaw rate sensor parity error
U1202 G-sensor parity error
U1204 Steering wheel sensor
communication error
U1205 G & yaw rate sensor message
counter error
19
ETACS CAN Timeout
RV meter
CAN main bus line
diagnostics
26
Engine CAN timeout
29
No receive fault detect signal
Diagnose CAN main
bus lines and
confirm input signals.
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