Mitsubishi Colt Ralliart. Manual — part 309

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-65

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-40 intermediate
connector, B-01 joint connector (CAN2) and B-03
joint connector (CAN1)

AC313821

Connectors: B-01, B-03, B-40

AE

B-01, B-03

B-40

B-40

B-03

B-01

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-01 joint
connector (CAN2) and B-40 intermediate
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

.

AC313821

Connectors: B-01, B-40

AC

B-01

B-40

B-40

B-01

(1) Disconnect the joint connector (CAN2) and the

intermediate 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

AC313937AV

Harness side: B-01

Harness side: B-40

Test
harness

Test
harness

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-66

(4) Continuity between B-40 intermediate connector

terminal No.3 and B-01 joint connector (CAN2)
terminal No.7

OK: Continuity (2

Ω or less)

AC313937AJ

Harness side: B-01

Test
harness

Harness side: B-40

Test
harness

(5) Continuity between B-40 intermediate connector

terminal No.4 and B-01 joint connector (CAN2)
terminal No.3

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>

Follow diagnosis item 5, 6, 8, 9, 10, 11 and
12. Refer to

P.54D-13

.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between joint connector (CAN1) and joint
connector (CAN2).

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-67

Diagnostic Item 8: Diagnose when the M.U.T.-III cannot receive the data sent by engine-ECU <M/T> or
engine-CVT-ECU <CVT>.

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
engine-ECU <M/T> or engine-CVT-ECU <CVT>"
when the M.U.T.-III checks the periodically sent data
from each ECU and cannot receive the engine-ECU
<M/T> or engine-CVT-ECU <CVT> data only.

TROUBLE JUDGEMENT CONDITIONS

M.U.T.-III judges the trouble when the periodically
sent data from engine-ECU <M/T> or
engine-CVT-ECU <CVT> cannot be received and
sent.

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-68

PROBABLE CAUSES

• Damaged harness wires and connectors

• Power supply circuit malfunction of the

engine-A/T-ECU

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

engine-CVT-ECU <CVT>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-01 joint connector
(CAN2) and A-08 engine-ECU <M/T> or
engine-CVT-ECU <CVT> connector

AC509191

Connector: A-08

Harness side

AD

A-08 (GR)

AC313820AF

Connector: B-01

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 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 B-01 joint
connector (CAN2) and 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

.

CAUTION

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

P.54D-5

.

AC509191

Connector: A-08

Harness side

AD

A-08 (GR)

AC313820AF

Connector: B-01

(1) Disconnect the joint connector (CAN2) and the

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