Mitsubishi Colt Ralliart. Manual — part 308

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-61

Diagnosis Item 6: Diagnose when the M.U.T.-III cannot receive the data sent by ETACS-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.

COMBINATION
METER

ETACS-
ECU

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 "the
M.U.T.-III cannot receive the sent data from the
ETACS-ECU" when the M.U.T.-III checks the periodi-
cally sent data from each ECU and cannot receive
the ETACS-ECU data only.

TROUBLE JUDGEMENT CONDITIONS

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

PROBABLE CAUSES

• Damaged harness wires and connectors

• Power supply circuit malfunction of the

ETACS-ECU

• Malfunction of the ETACS-ECU

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-62

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-03 joint connector
(CAN1) and B-133 ETACS-ECU connector

AC313820

Connector: B-03

AE

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

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-03 joint
connector (CAN1) and B-133 ETACS-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

.

AC313820

Connector: B-03

AE

AC313826 AB

Connector: B-133

Harness side

B-133 (GR)

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

ETACS-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

AC313937

Harness side: B-03

Harness side: B-133

AP

Test
harness

Test
harness

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-63

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

terminal No.7 and B-133 ETACS-ECU connector
terminal No.65

OK: Continuity (2

Ω or less)

AC313937

AC313937

Harness side: B-03

Harness side: B-133

Test
harness

AQ

Test
harness

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

terminal No.11 and B-133 ETACS-ECU
connector terminal No.56

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 ETACS-ECU may be
suspected. Diagnose the SWS. Refer to
GROUP 54B

− Troubleshooting

P.54B-43

.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between joint connector (CAN1) and the
ETACS-ECU connector.

Main

Index

Group

TOC

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54D-64

Diagnostic Item 7: Diagnose the lines between the joint connectors (CAN1 and CAN2).

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
the lines between the joint connectors (CAN1 and
CAN2)" when the M.U.T.-III checks the periodically
sent data from each ECU and cannot receive the
engine-A/T-ECU, the ABS-ECU, the A/C-ECU and
the SRS-ECU data.

TROUBLE JUDGEMENT CONDITIONS

M.U.T.-III judges the trouble when the periodically
sent data from EPS-ECU, G and yaw rate sensor
<vehicles with ASC>, ABS-ECU <vehicles without
ASC> or ASC-ECU <vehicles with ASC> and the
engine-ECU <M/T> or engine-CVT-ECU <CVT> can-
not be received and sent.

PROBABLE CAUSE

Damaged harness wires and connectors

Main

Index

Group

TOC