Mitsubishi Colt Ralliart. Manual — part 311

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-73

STEP 2. Resistance measurement at B-01 joint
connector (CAN2) and A-05 ABS-ECU <vehicles
without ASC> or ASC-ECU <vehicles with ASC>
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

.

AC601294

A-05 (B)

AB

Harness side

<ABS-ECU>

<ASC-ECU>

Connector: A-05

AC313820AF

Connector: B-01

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

ABS-ECU <vehicles without ASC> or ASC-ECU
<vehicles with ASC> 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.

AC313937

AC313937

Harness side: B-01

Test
harness

AR

Harness side: A-05

Test
harness

(4) Continuity between B-01 joint connector (CAN2)

terminal No.2 and A-05 ABS-ECU connector
terminal No.1 <vehicles without ASC>

OK: Continuity (2

Ω or less)

AC313937

Harness side: B-01

Test
harness

AS

Harness side: A-05

Test
harness

(5) Continuity between B-01 joint connector (CAN2)

terminal No.4 and A-05 ABS-ECU connector
terminal No.12 <vehicles without ASC>

OK: Continuity (2

Ω or less)

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-74

CAUTION

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

P.54D-5

.

AC312553

AC312553

Harness side: A-05

Harness side: B-01

AC312553EA

Test
harness

Test harness

(6) Continuity between B-01 joint connector (CAN2)

terminal No.2 and A-05 ASC-ECU connector
terminal No.38 <vehicles with ASC>

OK: Continuity (2

Ω or less)

AC312553EB

Harness side: A-05

Harness side: B-01

Test
harness

Test harness

(7) Continuity between B-01 joint connector (CAN2)

terminal No.4 and A-05 ASC-ECU connector
terminal No.39 <vehicles with ASC>

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>

Power supply to the ABS-ECU <vehicles
without ASC> or ASC-ECU <vehicles with
ASC> may be suspected. Diagnose the
ABS or ASC system. Refer to GROUP 35B
− Troubleshooting

P.35B-60

<vehicles

without ASC> or GROUP 35C

−

Troubleshooting

P.35C-86

<vehicles with

ASC>.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between the joint connector (CAN2) and the
ABS-ECU <vehicles without ASC> or
ASC-ECU <vehicles with ASC> connector.

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-75

Diagnostic Item 10: Diagnose when the M.U.T.-III cannot receive the data sent by EPS-ECU.

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.

EPS-ECU

COMBINATION
METER

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

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

FUNCTION

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

TROUBLE JUDGEMENT CONDITIONS

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

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-76

PROBABLE CAUSES

• Damaged harness wires and connectors

• Power supply circuit malfunction of the EPS-ECU

• Malfunction of the EPS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-01 joint connector
(CAN2) and B-37 EPS-ECU connector

AC313821

Connectors: B-01, B-37

AD

B-01

B-37

Harness side

B-37 (B)

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 B-37 EPS-ECU 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-37

AD

B-01

B-37

Harness side

B-37 (B)

B-01

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

EPS-ECU 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