MB991223
a
d
c
b
DO NOT USE
BA
TROUBLESHOOTING
ELECTRONICALLY CONTROLLED 4WD
27C-6
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
M1274000400047
Refer to GROUP 00
− Contents of Troubleshooting .
PRECAUTIONS FOR DIAGNOSIS
M1274000500088
• After troubleshooting, and removing/installing of
the electronically controlled 4WD system compo-
nents, check the diagnosis code using M.U.T.-III.
If a diagnosis code is set, erase it and check
again that no diagnosis code is set.
• Before performing a troubleshooting, check that
all four wheels and tyres are same in size, in
type, and in brand. The electronically controlled
4WD system will function correctly only when all
four wheels and tyres are same in size, and tyre
pressure is specified value.
• If any abnormality occurs in the electronically
controlled 4WD system, "4WD-E" and "LOCK"
indicators in the combination meter will illuminate
or a message will be displayed to warn the driver.
• When the vehicle is used under some severe
operational conditions (such as a long-time driv-
ing in 4WD on a sandy road, slushy road or road
with deep snows or towing or long uphill driving),
the electronically controlled 4WD system will illu-
minate "4WD-E" and "LOCK" indicators or dis-
play a message to warn the driver.
• The electronically controlled 4WD system is
equipped with the fail-safe function which prohib-
its 4WD control and shifts to 2WD control if any
abnormality occurs in the system. If there is a risk
that the vehicle behaviour suddenly changes, the
gradual shifting to 2WD control is chosen.
MB991223
a: MB991219
b: MB991220
c: MB991221
d: MB991222
Wiring harness set
a: Check harness
b: LED harness
c: LED harness adapter
d: Probe
Continuity check and voltage
measurement at the 4WD-ECU
wiring harness connector
MB992006
MB992006
Extra fine probe
Tool
Number
Name
Use