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) 

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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.

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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. 

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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.

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