Mitsubishi Outlander XL. Manual — part 1276

SYSTEM CONFIGURATION

ZC5018020000

ASC-ECU

AWD-ECU

ETACS-ECU

CAN_C

CAN_B

CAN_D

CAN_C

Engine-ECU

Engine

Transmission

Drive mode selector

Electronic
control
coupling

Combination
meter

Diagnosis
connector

Note: The dashed line indicates CAN communication lines (CAN_B, CAN_C, CAN_D).

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REAR AXLE

ELECTRONIC CONTROL AWD

CONTROL SCHEMATIC DIAGRAM

ZC5018030000

AWD-ECU

CAN_C

CAN_D

CAN_B

CAN_C

ETACS-ECU

Drive mode selector
(FWD, AWD, LOCK)

Engine-ECU
· Accelerator pedal
· Engine r/min

ASC-ECU
· 4 wheel speed
· AWD torque reduction
requirement

ETACS-ECU
· Vehicle information
· Key position
· Battery voltage

Feed forward control
· Throttle opening
· Vehicle speed

Drive mode working-out
Coupling torque
working-out

Feed back control
· Front/rear wheel
revolution difference
· Vehicle speed

Coupling torque
[Current (1- 3A)]

Combination meter
· Drive mode indicator
· Fail information

Diagnosis output

ASC-ECU
· Drive mode
· Coupling torque

Note: The dashed line indicates CAN communication
lines (CAN_B, CAN_C, CAN_D).

REAR AXLE

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ELECTRONIC CONTROL AWD

ELECTRONIC CONTROL AWD ELECTRIC CIRCUIT DIAGRAM

ZC5018040000

Engine-ECU

ASC-ECU or
ABS-ECU

Combination meter

Drive mode selector

Note:The dashed line indicates CAN communication lines.

AWD

FWD

LOCK

Diagnosis
connector

AWD-ECU

ETACS-ECU

LCD

FWD
AWD AUTO
AWD LOCK

Fusible
link No.34

Ignition switch
(IG1)

ETACS-ECU
(Fuse)

Electronic control
coupling solenoid

ETACS-ECU
(Fuse)

Fusible
link No.34

No.17
10A

No.12
7.5A

NO.5
10A

IG1
relay

27-12

REAR AXLE

ELECTRONIC CONTROL AWD

AWD-ECU

M22700000005USA0000010001

FUNCTION

The main functions of AWD-ECU are as follows:

1.

Communication function

｠

CAN communication with other ECUs (Engine
ECU, ASC-ECU, ETACS)

｠

Communication with drive mode switch: The
signal from the drive mode switch changes the
drive mode.

｠

Combination meter display: Drive mode is
displayed.

2.

Coupling control function

｠

Current output: Differential control function of
the electronic control coupling according to the
vehicle conditions

3.

ECU self-diagnosis function

｠

Initial check: ROM check, relay check, etc.

｠

Recording function of diagnosis codes and
freeze frame data in case of failure

｠

System shutdown function after failure
detection and AWD/LOCK indicator lamp
warning display function

｠

Normal control: Malfunction of CPU power
supply, relay check, open or short circuit of the
I/O signal, abnormal CAN communication

FAIL-SAFE FUNCTION

FAILURE DETECTION
ECU performs the following checks at a timing shown
in the chart below. ECU determines the malfunction

occurred when the failure detection conditions are
met, and it sets the diagnostic trouble code and
executes the countermeasures for trouble. When the
failure resume conditions are met, ECU determines
the status is normal, and resumes the system.

Start-up (Initial check just after the ignition
switch is turned ON.)

1.

CPU check

｠

Performs the ROM and RAM check.

2.

Actuator check

｠

After CPU check has been completed, check
the driving voltage with the actuator relay OFF.

Always (During ignition ON status other than
initial check operation)

1.

CPU check

｠

Performs CAN communication and interactive
check between CPUs.

2.

Power supply check

｠

Monitors the CPU supply voltage and checks if
the voltage is within specifications.

3.

Actuator check

｠

Checks if the actuator relay turns ON according
to the control.

｠

Compares the command current value from
CPU with the monitored current and checks if
they agree.

4.

External wire connection check

｠

Checks if the input and output of each external
wire connection is open, shorted, or stuck.

REAR AXLE

27-13

ELECTRONIC CONTROL AWD