Fault Diagnosis From Symptom - Isuzu Trooper 1999 Workshop Manual

Fault Diagnosis from Symptom

Troubles that are not indicated by the warning lamp are
listed in the table below. These troubles are caused by
the faults that cannot be detected by the self-diagnostic
function of the control unit.
If this type of trouble is observed, interview the customer
and conduct test runs to reproduce the trouble,
Phenomena
1 The tight corner braking is ob-
served when the vehicle is subject
to full steering.
2 Even if the 4WD SW is select to the
4WD position, the 4WD mode is not
active, resulting in remarkable rear
wheel spin.
f When the 4WD SW is select to
3
the 4WD position, the drive
resistance of the 4WD system is
too large to get sufficient running
speed.
f Noised drive line.
4 The shift on the fly system (front
axle) generates gear noises.
5 The braking distance gets long
even when the ABS is active.
DRIVE LINE CONTROL SYSTEM (TOD)
cross-check the reported trouble with the listed
phenomena, and diagnose and analyze the trouble on the
item by item basis.
Major cause
f The standard tires are not used.
f The tire pressure is incorrect.
f The tires are worn inuniformity.
f The transfer or wiring is
imperfect.
f The limited slip differential is
failed.
f The transfer or wiring is
imperfect.
f The shift on the fly system is
failed.
f The standard tires are not used.
f The tire pressure is incorrect.
f The tires are worn inuniformity.
f The transfer or wiring is
imperfect.
f The limited slip differential is
f The wiring is imperfect.
f The full automatic free wheel
hub is failed.
f The wiring is imperfect.
f The ABS is failed.
4B2–85
Corrective action
Check and recondition the ve-
hicle according to Chart 1.
Check and recondition the ve-
hicle according to Chart 2.
Check and recondition the ve-
hicle according to Chart 1.
Check and recondition the ve-
hicle according to Chart 3.
Check and recondition the ve-
hicle according to Chart 4.