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>.

Main

Index

Group

TOC

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

Main

Index

Group

TOC

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.

Main

Index

Group

TOC

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.

Main

Index

Group

TOC