DIAGNOSIS
TSB Revision
ELECTRONIC CONTROL AWD
27C-7
DIAGNOSIS
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
M1274000400069
Refer to GROUP 00
− Troubleshooting Contents
P.00-7
.
PRECAUTIONS FOR DIAGNOSIS
M1274000500055
• After troubleshooting, and removing/installing of
the electronic control AWD system components,
check the diagnostic trouble code using scan
tool. If a diagnostic trouble code is set, erase it
and check again that no diagnostic trouble code
is set.
• Before performing a troubleshooting, check that
all four wheels and tires are same in size, in type,
and in brand. The electronic control AWD system
will function correctly only when all four wheels
and tires are same in size, and tire pressure is
specified value.
• If any abnormality occurs in the electronic control
AWD system, it flashes the indicators (4WD and
LOCK) in the combination meter alternately to
inform of the abnormality.
• When the vehicle is used under some severe
operational conditions (such as a long-time driv-
ing in AWD on a sandy road, slushy road or road
with deep snows or towing or long hill-climbing),
the electronic control AWD system illuminates the
drive system fluid temperature warning display in
the combination meter in order to protect the
electronic control coupling fluid, at the same time
it flashes the indicator (4WD or LOCK) corre-
sponding to the selected drive mode to inform of
the abnormality.
• The electronic control AWD system is equipped
with the fail-safe function which prohibits AWD
control and shifts to FWD control if any abnormal-
ity occurs in the system. If there is a risk that the
vehicle behavior suddenly changes, the gradual
shifting to FWD control is chosen.
MB991223
Harness set
a: MB991219
Test harness
b: MB991220
LED harness
c: MB991221
LED harness adapter
d: MB991222
Probe
MB991223
Continuity check and
voltage measurement at
the AWD-ECU wiring
harness connector
MB992006
Extra fine probe
General service tool
Tool
Tool number and name Supersession
Application
MB991223
a
d
c
b
Do not use
BD
MB992006