Mitsubishi Outlander GS45X. Manual - part 1329

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-39

DTC C2101: Abnormal battery voltage (Too high)

ETACS-ECU

FUSIBLE
LINK

34

IGNITION
SWITCH (IG1)

IG1
RELAY

AWD-ECU

ACA02791

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-40

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

AWD-ECU detects a power supply voltage abnormal 
increase, and if any abnormality occurs, 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 C2101.

• IG1 voltage: More than 17 V

• Voltage between the battery and ETACS-ECU: 

More than 17 V

.

TROUBLESHOOTING HINTS

Current trouble

• Damaged wiring harness and connectors

• High-voltage short-circuit between the battery 

and AWD-ECU

• Malfunction of generator or other power sup-

ply systems

Past trouble

• Intermittent wiring harness or connector failure

NOTE: For diagnosis procedures, refer to "How 
to treat past trouble" (Refer to GROUP 00 

−

 How 

to Use Troubleshooting/How to Treat Past Trou-
ble 

P.00-17

).

• Malfunction of generator or other power supply 

systems

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. Battery voltage check
Check the battery voltage.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Charge or replace the battery.

STEP 2. Generator output current check
Check if the generator is correctly operated (Refer to GROUP 
16 

− On-vehicle Service/Output Current Test 

P.16-8

).

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Replace the generator.

AC901228AE

ETACS-ECU 
(front view)

Connectors: C309

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-41

STEP 3. Voltage measurement at the ETACS-ECU 
connector
(1) Disconnect the C-309 ETACS-ECU connector.
(2) Measure the voltage between the C-309 harness side 

connector terminal No.1 and the body ground.

OK: System voltage

Q: Is the check result normal?

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

STEP 4. Wiring harness check
Check the wiring harness between the battery and the C-309 
ETACS-ECU connector for damage or other problem.
Q: Is the wiring harness in good condition?

YES : Go to Step 8.
NO :  Repair damage or other problem in the wiring 

harness. Then go to Step 8.

STEP 5. 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 7.
NO :  Repair the CAN bus line (Refer to GROUP 54C 

− 

Troubleshooting/CAN Bus Diagnostics Table 

P.54C-17

). On completion, go to Step 6.

STEP 6. Check whether the DTC is reset after repairing the 
CAN bus line.
(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 C2101 set?

YES : Go to Step 7.
NO :  The procedure is complete.

STEP 7. 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 C2101 set?

YES : Replace AWD-ECU (Refer to 

P.27C-95

). Then go to 

Step 8 .

NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− Troubleshooting/How to Cope with 

Intermittent Malfunctions 

P.00-15

).

DIAGNOSIS

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ELECTRONIC CONTROL AWD

27C-42

STEP 8. 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 C2101 set?

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