Mitsubishi Colt Ralliart. Manual - part 319

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-20

Diagnosis code No.U1701: Communication error with column switch

CAUTION

If diagnosis code No.U1701 is set in the 
ETACS-ECU, diagnose the CAN bus lines.

FUSIBLE
LINK

1

IGNITION
SWITCH (IG1)

COLUMN
SWITCH

COLUMN-ECU

ETACS-ECU

DIAGNOSIS
CONNECTOR

FRONT SIDE

Column Switch Power Supply and SWS Communication Circuit

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

Main

Index

Group

TOC

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-21

TROUBLE JUDGMENT

The ETACS-ECU communicates with the column 
switch through the SWS communication lines. If 
there is any trouble in that communication, diagnosis 
code No.U1702 will be set.

COMMENT ON TROUBLE SYMPTOM

The column switch, the ETACS-ECU, connector(s), 
or wiring harness between the two may be defective.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-13

).

Step 2. Use the M.U.T.-III to confirm a diagnosis 
code. (M.U.T.-III diagnosis code)
(1) Ignition switch: ON
(2) On completion, check that diagnosis code 

No.U1701 is not reset.

Q: Is diagnosis code No.U1701 set?

YES : 

Go to Step 3.

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

Step 3. Connector check: B-135 column switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

Step 4. Voltage measurement at the B-135 
column switch connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Voltage between B-135 column switch connector 

No.1 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

AC401044AC

Connector: B-135

Harness side

AC401044AC

Connector: B-135

Harness side

AC310507FB

Connector B-135 
(Harness side)

Main

Index

Group

TOC

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-22

Step 5. Check the wiring harness between B-135 
column switch connector terminal No.1 to fusible 
link (1).

NOTE: 

Prior to the wiring harness inspection, check junction 
block connectors B-108, B-131 and joint connector 
B-22, and repair if necessary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Repair the wiring harness.

Step 6. Resistance measurement at the B-135 
column switch connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Continuity between B-135 column switch 

connector No.4 and body earth

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Go to Step 7.

AC401044AC

Connector: B-135

Harness side

AC401055

Connector: B-22

AD

AC313870

Connector: B-108

BD

Junction block (Front view)

B-108(B)

Harness side

AC313872

Connector: B-131

BD

Harness side

AC401044AC

Connector: B-135

Harness side

AC310506 DX

Connector B-135 
(Harness side)

10

5

6

7

9 8

3

4

2 1

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Index

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TOC

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-23

Step 7. Check the wiring harness between B-135 
column switch connector No.4 to body earth.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector B-25, and repair if necessary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

Step 8. Connector check: B-133 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the defective connector.

Step 9. Check the wiring harness from B-133 
ETACS-ECU connector terminal Nos. 54, 60 and 
63 to B-135 column switch connector terminal 
Nos. 3, 10 and 2.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

Step 10. Check whether the diagnosis code is 
reset.
Replace the column switch, and then check that the 
diagnosis code is not reset.
(1) Replace the column switch.
(2) Ignition switch: ON
(3) On completion, check that diagnosis code 

No.U1701 is not reset.

Q: Is diagnosis code No.U1701 set?

YES : 

Replace the ETACS-ECU.

NO : 

The procedure is complete.

AC401044AC

Connector: B-135

Harness side

AC401055

Connector: B-25

AG

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

AC313826AC

B-133 (GR)

Connector: B-133

Harness side

Junction block (Rear view)

AC401044AC

Connector: B-135

Harness side

Main

Index

Group

TOC