Mitsubishi Outlander GS45X. Manual - part 186

ETACS

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CHASSIS ELECTRICAL

54A-741

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line. 

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-730

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 2. Using scan tool MB991958, read the AWD-ECU 
diagnostic trouble code
Check if DTC is set to the AWD-ECU.
Q: Is the DTC set?

YES : Troubleshoot the electronic control AWD. (Refer to 

GROUP 27C, Troubleshooting 

P.27C-11

.)

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the combination 
meter diagnostic trouble code.
Check if the DTC U0114 is set to the combination.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

ETACS

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CHASSIS ELECTRICAL

54A-742

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the AWD-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the AWD-ECU and the ETACS-ECU. 
(Refer to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

)

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ETACS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the AWD-ECU and the ETACS-ECU. 
(Refer to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

)

DTC U0121: ABS-ECU or ASC-ECU CAN timeout

CAUTION

• If DTC U0121 is set to the ETACS-ECU, always 

diagnose the CAN bus line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

TROUBLE JUDGMENT

If the signal from ABS-ECU or ASC-ECU cannot be 
received, the ETACS-ECU sets DTC U0121.

.

JUDGMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the ABS-ECU or 
ASC-ECU cannot be established for 0.6 second or 
more, the ETACS-ECU determines that a problem 
has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse(IOD fuse), or the odometer value is at 80.5 
km (50.0 miles) or more.

• ETACS-ECU system voltage is at 10−16 volts.

.

TROUBLESHOOTING HINTS

• The ABS-ECU may be defective.

• The ASC-ECU may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

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CHASSIS ELECTRICAL

54A-743

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line. 

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-730

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 2. Using scan tool MB991958, check for any ABS or 
ASC diagnostic trouble code.
Check if DTC is set to the ABS-ECU or ASC-ECU.
Q: Is the DTC set?

YES : Troubleshoot the ABS or ASC. (Refer to GROUP 

35B, Diagnosis 

P.35B-15

 <ABS> or GROUP 35C, 

Diagnosis 

P.35C-18

 <ASC>.)

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the transaxle 
control module diagnostic trouble code.
Check if the DTC U0121 is set to the transaxle control module 
ECU.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-744

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ABS-ECU or ASC-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the ABS-ECU or ASC-ECU and the 
ETACS-ECU. (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

)

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ETACS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the ABS-ECU or ASC-ECU and the 
ETACS-ECU. (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

)

DTC U0126: Steering wheel sensor CAN timeout

CAUTION

• If DTC U0126 is set to the ETACS-ECU, always 

diagnose the CAN bus line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

TROUBLE JUDGMENT

If the signal from steering wheel sensor cannot be 
received, the ETACS-ECU sets DTC U0126.

.

JUDGMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the steering 
wheel sensor cannot be established for 0.6 second 
or more, the ETACS-ECU determines that a problem 
has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse (IOD fuse), or the odometer value is at 80.5 
km (50.0 miles) or more.

• ETACS-ECU system voltage is at 10−16 volts.

.

TROUBLESHOOTING HINTS

• The steering wheel sensor may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.