Mitsubishi Colt Ralliart. Manual - part 307

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-57

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the combination meter (incorporat-

ing meter-A/C-ECU)

• Malfunction of the engine-ECU <M/T> or 

engine-CVT-ECU <CVT>

DIAGNOSIS PROCEDURE

STEP 1. Resistance measurement at B-15 
combination meter connector.

CAUTION

A digital multimeter should be used. For details 
refer to 

P.54D-5

.

AC401055

AE

Connector: B-15

B-15 (B)

Harness side

(1) Remove the combination meter, and measure at 

the equipment side.

AC204738FM

Equipment side: B-15

Test 
harness

Test 
harness

(2) Resistance between B-15 combination meter 

connector terminal Nos.1 and 2

OK: 120 

± 20 Ω

Q: Is the check result normal?

YES : 

<Within 120 

± 20 Ω> Go to Step 2.

NO : 

<Not within 120 

± 20 Ω> Replace the 

combination meter.

STEP 2. Resistance measurement at A-08 
engine-ECU <M/T> or engine-CVT-ECU <CVT> 
connector.

CAUTION

A digital multimeter should be used. For details 
refer to 

P.54D-5

.

AC509191

Connector: A-08

Harness side

AD

A-08 (GR)

(1) Remove the engine-ECU <M/T> or 

engine-CVT-ECU <CVT>, and measure at the 
equipment side.

AC204738

AC204738FT

Equipment side: A-08

Test 
harness

Test 
harness

(2) Resistance at A-08 engine-ECU <M/T> or 

engine-CVT-ECU <CVT> connector terminal 
Nos.105 and 106

OK: 120 

± 20 Ω

Q: Is the check result normal?

YES : 

<Within 120 

± 20 Ω> Repair the wiring 

harness between combination meter 
connector and engine-ECU <M/T> or 
engine-CVT-ECU <CVT> connector.

NO : 

<Not within 120 

± 20 Ω> Replace the 

engine-ECU <M/T> or engine-CVT-ECU 
<CVT>.

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TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-58

Diagnosis Item 5: Diagnose when the M.U.T.-III cannot receive the data sent by combination meter.

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.

ENGINE-ECU <M/T> OR
ENGINE-CVT-ECU <CVT>

COMBINATION
METER

DIAGNOSIS
CONNECTOR

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

FUNCTION

The diagnostic result demonstrates that "Diagnose 
when the M.U.T.-III cannot receive the data sent by 
combination meter" when the M.U.T.-III checks the 
periodically sent data from each ECU and cannot 
receive the combination meter data only.

TROUBLE JUDGEMENT CONDITIONS

M.U.T.-III judges the trouble when the periodically 
sent data from combination meter cannot be 
received and sent. 

PROBABLE CAUSES

• Damaged harness wires and connectors

• Power supply circuit malfunction of the combina-

tion meter

• Malfunction of the combination meter

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TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-59

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-03 joint connector 
(CAN1) and B-15 combination meter connector

AC313820

Connector: B-03

AE

AC401055

AE

Connector: B-15

B-15 (B)

Harness side

CAUTION

The strand end of the twist wire should be within 
10 cm from the connector. For details refer to 

P.54D-5

.

When checking the joint connector, ensure that its 
wiring harness side is not damaged.

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 B-03 joint 
connector (CAN1) and B-15 combination meter 
connector.

CAUTION

A digital multimeter should be used. For details 
refer to 

P.54D-5

.

CAUTION

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

P.54D-5

.

AC313820

Connector: B-03

AE

AC401055

AE

Connector: B-15

B-15 (B)

Harness side

(1) Disconnect the joint connector (CAN1) and the 

combination meter connector, and measure at 
the wiring harness side.

(2) Turn the ignition switch to the OFF (LOCK) 

position.

CAUTION

When measuring the resistance, disconnect the 
negative battery terminal. For details refer to 

P.54D-5

.

(3) Ensure that the negative battery terminal is 

disconnected.

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AC313937

Harness side: B-03

Test 
harness

Harness side: B-15

Test 
harness

AD

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-60

(4) Continuity between B-03 joint connector (CAN1) 

terminal No.3 and B-15 combination meter 
connector terminal No.1

OK: Continuity (2 

Ω or less) 

AC313937

Harness side: B-03

Harness side: B-15

Test 
harness

AF

Test 
harness

(5) Continuity between B-03 joint connector (CAN1) 

terminal No.8 and B-15 combination meter 
connector terminal No.2

OK: Continuity (2 

Ω or less) 

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to 

P.54D-5

.

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 (CAN1) and the 
combination meter connector.

STEP 3. Resistance measurement at B-15 
combination meter connector

CAUTION

A digital multimeter should be used. For details 
refer to 

P.54D-5

.

AC401055

AE

Connector: B-15

B-15 (B)

Harness side

(1) Remove the combination meter, and measure at 

the equipment side.

AC313936

AC313936 AG

Harness side: B-15

Test 
harness

Test 
harness

(2) Resistance between B-15 combination meter 

connector terminal Nos.1 and 2

OK: 120 

± 20 Ω

Q: Is the check result normal?

YES : 

<120 

± 20 within Ω> Power supply to the 

combination meter may be suspected. 
Diagnose the combination meter. Refer to 
GROUP 54A 

− Troubleshooting 

P.54A-44

.

NO : 

<120 

± 20 not within Ω> Replace the 

combination meter.

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