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