Mitsubishi Outlander GS45X. Manual - part 1335

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-63

STEP 3. Check whether the DTC is reset.
Q: Is the DTC U0001 set?

YES : Diagnose again from Step 1.
NO :  This diagnosis is complete.

DTC U0100: Engine CAN time-out

CAUTION

• If more than three minutes elapse after the 

ignition switch is turned ON without starting 
engine, AWD-ECU may set DTC U0100 as past 
trouble.

• If there is any problem in the CAN bus lines, 

an incorrect DTC may be set. Prior to this 
diagnosis, always diagnose the CAN bus 
lines.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

OPERATION

AWD-ECU temporarily limits the AWD functions if it 
has not received the signal from the engine control 
module.

.

DTC SET CONDITIONS

If the following conditions are met when the system 
is in operation (always), AWD-ECU gradually 
switches the control from AWD to AWD AUTO, 
flashes the AWD/LOCK indicators alternately, and 
sets the DTC U0001.

• IG1 power supply voltage: 10 V or more

• Chassis No. signal, throttle angle signal, or 

engine speed signal cannot be received.

.

TROUBLESHOOTING HINTS

Current trouble

• Wiring harness or connector failure in the CAN 

bus lines between the engine control module and 
AWD-ECU

• Engine control module malfunction

• AWD-ECU malfunction

Past trouble

• Refer to "How to treat past trouble" (GROUP 00 − 

How to Use Troubleshooting/How to Treat Past 
Trouble 

P.00-17

) for proceeding the diagnostics. 

Diagnose mainly wiring harness or connector fail-
ure in the CAN bus lines between the engine con-
trol module and AWD-ECU, and malfunction in 
the power supply system for the engine control 
module.
NOTE: For a past trouble, you cannot find it by 
the scan tool MB991958 CAN bus diagnostics 
even if there is any failure in CAN bus lines. In 
this case, check the CAN bus lines in the same 
manner as How to cope with intermittent malfunc-
tion (refer to GROUP 00 

−

 How to Use Trouble-

shooting/How to Cope with Intermittent 
Malfunction 

P.00-15

). You can narrow down the 

possible cause of the trouble by referring to the 
DTC, which is set regarding the CAN communi-
cation-linked ECUs. (Refer to GROUP 54C 

−

 

CAN Bus Line Diagnostic Flow 

P.54C-10

.)

DIAGNOSIS

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

• MB991824: Vehicle Communication Interface

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 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 54C 

− 

Troubleshooting/CAN Bus Diagnostics Table 

P.54C-17

). Then go to Step 2.

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-64

STEP 2. Scan tool MB991958 DTC of other systems
Check that the bus-off error DTC is set in the engine control 
system.
Q: Is the DTC set?

YES : Troubleshoot the engine control system (Refer to 

GROUP 13A 

− Troubleshooting/DTC Chart 

P.13A-49

 

<4B1>, GROUP 13B 

− Troubleshooting/DTC Chart 

P.13B-50

 <6B3>).

NO :  Go to Step 3.

STEP 3. Scan tool MB991958 DTC of other systems
Check if a DTC, which relates to the CAN communica-
tion-linked systems below, is set.

• Combination meter

U0100: Engine CAN time-out DTC

• ETACS

U0100: Engine CAN time-out DTC

Q: Is the DTC set?

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

STEP 4. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(3) Check if the DTC is set.
Q: Is the DTC U0100 set?

YES : Replace the engine control module (Refer to GROUP 

13A 

− Engine Control Module 

P.13A-887

 <4B1>, 

GROUP 13B 

− Engine Control Module 

P.13B-903

 

<6B3>). Then go to Step 6    .

NO :  A poor connection, open circuit or other intermittent 

malfunction in the CAN bus lines between the engine 
control module and the AWD-ECU is suspected 
(Refer to GROUP 00 

− How to Use 

Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

). Then go to Step 5

STEP 5. Check whether the DTC is reset.
Q: Is the DTC U0100 set?

YES : Replace AWD-ECU (Refer to 

P.27C-95

). Then go to 

Step 6   .

NO :  A poor connection, open circuit or other intermittent 

malfunction in the CAN bus lines between the engine 
control module and AWD-ECU is suspected (Refer to 
GROUP 00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunctions 

P.00-15

).

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-65

STEP 6. Check whether the DTC is reset.
Q: Is the DTC U0100 set?

YES : Diagnose again from Step 1.
NO :  This diagnosis is complete.

DTC U0121: ABS CAN time-out

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect DTC may be set. Prior to this 
diagnosis, always diagnose the CAN bus 
lines.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

OPERATION

AWD-ECU receives the data (such as ABS sensor 
signal, ABS operation signal) via the CAN bus lines. 
If it cannot receive such data, it interrupts the system.

.

DTC SET CONDITIONS

If the following conditions are met when the system 
is activated, AWD-ECU gradually switches the con-
trol from AWD to FWD, flashes the AWD/LOCK indi-
cators alternately, and sets the DTC U0121.

• IG1 voltage: 10 V or more

• ABS signal (such as wheel speed signal) cannot 

be received.

.

TROUBLESHOOTING HINTS

Current trouble

• Wiring harness or connector failure between 

ABS/ASC-ECU and the stoplight switch

• Malfunction of the ABS sensor

• Malfunction of the stoplight switch

• ABS/ASC-ECU malfunction

• AWD-ECU malfunction

Past trouble

• Refer to "How to treat past trouble" (GROUP 00 − 

How to Use Troubleshooting/How to Treat Past 
Trouble 

P.00-17

) for proceeding the diagnostics.

DIAGNOSIS

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

• MB991824: Vehicle Communication Interface

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 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 54C 

− 

Troubleshooting/CAN Bus Diagnostics Table 

P.54C-17

). Then go to Step 2.

STEP 2. Scan tool MB991958 data list
Check the following data list (Refer to 

P.27C-90

).

• Item 07: CAN system (ABS/ASC)

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Go to Step 3.

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-66

STEP 3. Scan tool MB991958 DTC of other systems
Check if a DTC, which relates to the CAN communica-
tion-linked systems below, is set.

• Engine

U0121: ABS/ASC time-out DTC

Q: Is the DTC set?

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

STEP 4. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(3) Check if the DTC is set.
Q: Is the DTC U0121 set?

YES : Troubleshoot the ABS system (Refer to GROUP 35B 

− Troubleshooting/DTC Chart 

P.35B-15

 <Vehicles 

with ABS>), the ASC system (Refer to GROUP 35C 

− 

Troubleshooting/DTC Chart 

P.35C-8

 <Vehicles with 

ASC>). Then go to Step 5.

NO :  Go to Step 6.

STEP 5. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(3) Check if the DTC is set.
Q: Is the DTC U0121 set?

YES : Replace AWD-ECU (Refer to 

P.27C-95

). Then go to 

Step  6.

NO :  The procedure is complete.

STEP 6. Check whether the DTC is reset.
Q: Is the DTC U0121 set?

YES : Diagnose again from Step 1.
NO :  The procedure is complete.