Mitsubishi Outlander GS45X. Manual - part 1322

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-11

DIAGNOSTIC TROUBLE CODE CHART

M1274000800164

CAUTION

During diagnosis, a DTC associated with other system may be set when the ignition switch is turned 
on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set, 
erase them all.

DTC

Item

Reference 
page

C1078

Tire with incorrect diameter equipped

P.27C-12

C1456

Wiring harness or coupling coil overcurrent failure

P.27C-14

C145A

Wiring harness or coupling coil short circuit failure

P.27C-19

C145D

Wiring harness or coupling open circuit failure

P.27C-24

C145F

Coupling overload

P.27C-28

C1460

Drive mode selector circuit failure

P.27C-31

C2100

Abnormal battery voltage (too low)

P.27C-35

C2101

Abnormal battery voltage (too high)

P.27C-39

C211C

Abnormal IG1 power supply low voltage

P.27C-43

C211D

Abnormal IG1 power supply high voltage

P.27C-47

C211E

Abnormal power supply voltage (too low)

P.27C-51

C211F

Abnormal power supply voltage (too high)

P.27C-59

C2208

AWD-ECU internal error

P.27C-62

U0001

Bus-off error

P.27C-62

U0100

Engine CAN time-out

P.27C-63

U0121

ABS CAN time-out

P.27C-65

U0141

ETACS CAN time-out

P.27C-67

U0401

Engine CAN data error

P.27C-69

U0415

ABS CAN data error

P.27C-71

U113C

Wheel speed sensor data error

P.27C-72

U1415

Variant coding not implemented

P.27C-74

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-12

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC C1078: Tire with incorrect diameter equipped

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.

.

OPERATION

If the vehicle is driven with a tire with incorrect diam-
eter (high-pressure type spare tire or flat tire) 
installed to either wheel in the AWD mode, 
AWD-ECU controls the coupling in high torque. If this 
is the case, the coupling temperature may rise to 
cause a seizure.

.

DTC SET CONDITIONS

If the following conditions are met simultaneously, 
AWD-ECU gradually reduces the AWD control 
torque to the specified torque, flashes the 
AWD/LOCK indicators alternately, and sets the DTC 
C1078.

• AWD selector switch: AWD/LOCK

• Difference in rotation speed between the front 

and rear wheels exceeds continuously a specific 
value.

.

TROUBLESHOOTING HINTS

Current trouble

• Tire with incorrect diameter (high-pressure type 

spare tire or flat tire) equipped

• Improper adjusted tire pressure

Past trouble

• Tire with incorrect diameter (high-pressure type 

spare tire or flat tire) has been installed.

• The tire pressure has been adjusted due to 

improper tire pressure.

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 3.
NO :  Repair the CAN bus line (Refer to GROUP 54C 

− 

Troubleshooting/CAN Bus Diagnostics Table 

P.54C-17

). On completion, go to Step 2.

STEP 2. Check whether the DTC is reset after repairing the 
CAN bus line.
(1) Erase the DTC.
(2) Drive the vehicle straight with throttle opening angle of 

approximately 50% or less, and constant vehicle speed of 
30 km/h or higher for 20 seconds or longer.

(3) Check if the DTC is set.
Q: Is the DTC C1078 set?

YES : Go to Step 3.
NO :  The procedure is complete.

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-13

STEP 3. Tire check
Q: Are all installed wheels and tires same in size?

YES : Go to Step 4.
NO :  Install the same size wheels and tires. Then go to 

Step 4.

STEP 4. Tire pressure check
Check that the tire pressure of the installed tires agrees with 
the tire pressure specified on the tire pressure label.
Q: Is the tire pressure normal?

YES : Go to Step 6.
NO :  Adjust the tire pressure. Then go to Step 5.

STEP 5. Check whether the DTC is reset.
Drive the vehicle straight with throttle opening angle of approxi-
mately 50% or less, and constant vehicle speed of 30 km/h 
(18.6 mph) or higher for 20 seconds or longer.
Q: Is the DTC C1078 set?

YES : Go to Step 6.
NO :  This code is set because the tire pressure was 

improper or a tire with incorrect diameter is installed.

STEP 6. Scan tool MB991958 data list
Check the following data list (Refer to 

P.27C-90

).

• Item 16: FL wheel speed sensor

• Item 17: FR wheel speed sensor

• Item 18: RL wheel speed sensor

• Item 19: RR wheel speed sensor

Q: Is the check result normal?

YES : Go to Step 7.
NO :  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-18

 <Vehicles with 

ASC>). Then go to Step 7.

STEP 7. Check whether the DTC is reset.
Drive the vehicle straight with throttle opening angle of approxi-
mately 50% or less, and constant vehicle speed of 30 km/h 
(18.6 mph) or higher for 20 seconds or longer.
Q: Is the DTC C1078 set?

YES : Replace AWD-ECU (Refer to 

P.27C-95

). Then go to 

Step 8    .

NO :  The procedure is complete.

STEP 8. Check whether the DTC is reset.
Q: Is the DTC C1078 set?

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

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-14

DTC C1456: Wiring harness or coupling coil overcurrent failure

ELECTRONIC
CONTROL
COUPLING
SOLENOID

ETACS-ECU

FUSIBLE
LINK

34

IGNITION
SWITCH (IG1)

IG1
RELAY

AWD-ECU

ACA02787

AC901227AB

C-128

C-31

C-138

Connectors: C-31, C-128, C-138

AC901229AB

Connectors: D-113, D119

D-113

D-119