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Mitsubishi Outlander XL. Manual - part 569

DTC C2101: Abnormal battery voltage (Too high)

M12704100019USA0000010000

ETACS-ECU

FUSIBLE
LINK

IGNITION
SWITCH (IG1)

IG1
RELAY

AWD-ECU

D7G27M002A00

GREY

WHITE

C-128

C-31

C-309

ZC6000240000

Connectors: C-31, C-128

C-128

C-31

ZC6000260001

ETACS-ECU
(front view)

C-313
(BR)

C-317

Connectors: C-313, C-317

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.

ELECTRONIC CONTROL AWD

27C-35

DIAGNOSIS

DTC SET CONDITIONS
If the following conditions are met when the system is
activated, AWD-ECU gradually switches the control
from AWD to FWD, flashes the AWD/LOCK indicators
alternately, and sets the DTC No. 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 alternator or other power supply
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 Treat Past Trouble P.00-17.)

｠

Malfunction of alternator 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. Voltage measurement at the ETACS-ECU
connector

(1)

Disconnect the C-309 ETACS-ECU connector.

ZC3047220000

C-309 harness
connector:
harness side

(2)

Measure the voltage between the C-309 harness side
connector terminal No. 1 and the body earth.

OK: Battery voltage

Q:Is the check result normal?

YES:

Go to Step 11.

NO:

Go to Step 3.

STEP 3. 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 4.

NO:

Repair damage or other problem in the wiring harness.

Then go to Step 11.

STEP 4. 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 6.

27C-36

ELECTRONIC CONTROL AWD

DIAGNOSIS

NO:

Repair the CAN bus line. (Refer to GROUP 54D - CAN

bus diagnostic chart P.54D-17.) On completion, go to
Step 5.

STEP 5. 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 alternator is correctly operated. (Refer to
GROUP 16 - On-vehicle Service, Generator Output Line
Voltage Drop Test P.16a-6.)

(4)

Check if the DTC is set.

Q:Is the DTC No. C2101 set?

YES:

Go to Step 6.

NO:

This diagnosis is complete.

STEP 6. Check the following connector:
Check the connectors below for improper engagement, terminal
damage or terminal drawn in the connector case.

｠

C-128 AWD-ECU connector

｠

C-309, C-315 ETACS-ECU connector

｠

C-31 intermediate connector

Q:Are the connectors and terminals in good condition?

YES:

Go to Step 7.

NO:

Repair the connector(s) or terminal(s). Then go to

Step 11.

STEP 7. Wiring harness check
Check the wiring harness between the C-128 AWD-ECU
connector and the C-315 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 11.

STEP 8. Voltage measurement at the AWD-ECU connector

(1)

Disconnect the C-128 AWD-ECU connector.

C-128 harness
connector:
harness side

ZC3047200000

(2)

Measure the voltage between the C-128 wiring harness side
connector terminals No. 4 and No. 10.

OK: Battery voltage

Q:Is the check result normal?

YES:

Go to Step 9.

NO:

Go to Step 11.

STEP 9. Wiring harness check
Check the wiring harness between the C-128 AWD-ECU
connector (terminal No. 3) and the C-309 ETACS-ECU
connector (terminal No. 1) for damage or other problem.

ELECTRONIC CONTROL AWD

27C-37

DIAGNOSIS

Q:Is the wiring harness in good condition?

YES:

Go to Step 10.

NO:

Repair the wiring harness. Then go to Step 11.

STEP 10. 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 alternator is correctly operated. (Refer to
GROUP 16 - On-vehicle Service, Generator Output Line
Voltage Drop Test P.16a-6.)

(4)

Check if the DTC is set.

Q:Is the DTC No. C2101 set?

YES:

Replace AWD-ECU. (Refer to P.27C-92.) Then go to

Step 11.

NO:

The trouble can be an intermittent malfunction.

(Refer to GROUP 00 - How to Cope with Intermittent
Malfunction P.00-15.)

STEP 11. 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 alternator is correctly operated. (Refer to
GROUP 16 - On-vehicle Service, Generator Output Line
Voltage Drop Test P.16a-6.)

(4)

Check if the DTC is set.

Q:Is the DTC No. C2101 set?

YES:

Diagnose again from Step 1.

NO:

This diagnosis is complete.

27C-38

ELECTRONIC CONTROL AWD

DIAGNOSIS

Content .. 567 568 569 570 ..