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 

P.54C-7

.

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 

P.54C-7

.

CAUTION

The test wiring harness should be used. For 
details refer to 

P.54C-7

.

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 

P.54C-7

.

(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 

P.54C-7

.

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 

P.54C-7

.

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 

P.54C-7

.

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.