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ELECTRIC POWER STEERING
(EPS)
TROUBLESHOOTING INDEX
DEFINITIONS
l at
ch:
The EPS
indicator
turns
on and
stays
on whenever
the ignition switch
is
in
the ON position, or
until the DTC
is
erased.
Reset: The EPS
indicator
turns on when the DIG
is set.
The EPS
indicator witl
not turn
on
after
the ignition
switch
is
cycled
from
ON to
OFF,
but
the OTC
will
be
stored
in the EPS EeU.
Revest
:
The EPS
indicator
turns
on
when the OTe
is set.
The EPS indicator will turn
off after vehicle
has recovered from
the
fail -safe
condition,
but the OTC
will be stored
in the
EPS
EeU
.
There
was a temporary problem.
but the
system is now fully
operational.
Initial
diagnosis: Performed right
after
the engine
starts and until
the EP$ indicator
goes
OFF.
Regular
diagnosis:
Performed
right
after the initial diagnosis until the ignition switch is turned
OFF.
l11_0~TC
Function
Failure
Symptom
/ Fail-safe
functi on
Excessive
change of
the
vehicle speed signal
j
lndicato
r
ON/Substitution
(Regu lar
diagnosis)
the
engine RPM
11 -02
Comparison
between the
vehicle speed and the
Indicator
ONlSubstitution
engine speed signal
the engine
RPM
(Regular
diagnosis)
Iindicator ONlHalt steering assist
13-01
EPS
ECU internal circuit (Lower
FET
stuck ON)
I
(Initial
diagnosis)
immediately
13·02
EPS ECU
internal circuit (Upper
FET
stuck ON)
Indicator
ONlHalt steering assist
(Initial diagnosis)
immediately
13-03
EPS ECU
internal circuit (FET
stuck
ON
<over
cur-
Indicator
ON/Halt steering assist
renb)
immediately
(Regular
diagnosis)
13-04
EPS ECU
internal circuit
(FET stuck
ON (VM<Volt-
Indicator
ON/Halt
steering assist
age Motor>))
immediately
(Regular
diagnosis)
13-05
EPS ECU
internal circuit
(FET
stuck ON
(over
cur-
Indicator
ONIHalt steering assist
rent<accumu
lated»
immediately
(Regular
diagnosis)
i
Indicator
ONIHalt
steering assist
14-01
EPS ECU
internal circuit
(Power relay
sluck ON)
I i i
I
immediately
circuit (Fail-safe
relay 1
stuck
Indicator
ON/Halt
steering assist
immediately
circuit (Fail-safe
relay
2 stuck
Indicator ON/Halt
steering assist
immediately
I
diagnosis)
internal circuit
(Power
relay stuck open) Indicator
ON/Halt
steering assist
diagnosis)
immediately
selectable system blinking communication 4WD indicator blink
(EPS
indicator
will
not
come ON)I2WD assist
power
stabilized
line
volt-
Indicator ON/2WD assist power
stabi-
age
lized or
EPS
operation is normally
(Regular diagnosis)
16·01
EPS ECU
internal circuit (Direction determine
Indicator
ON/Halt steering assist
logic
ci rcu
it)
immediately
(Regular
diagnosis)
16-02
EPS ECU
internal circuit
(INH
output circuit)
Indicator
ON/Halt
steering assist
(Initial diagnosis)
immediately
17-01
EPS ECU
internal circuit
(Voltage
raise
transfor·
Indicator
ON/Halt
steering assist
mation
ci
rcuit)
immediately
(Initial diagnosis)
17-02
'
EPS ECU
internal circuftlvoltage raise
transfor-
Indicator
ON/Halt
steering assist
mation circuit)
under the Specified condition
(Regular
diagnosis)
18·01
jEPS ECU
internal circuit (Current sensor)
Indicator ON/Hall
steering assist
(Initial diagnosis)
immediately
Lat
chl
Reset
l
Ref~~
25-18
25-20
Reset
25·
20
Reset
25·21
i
Reset
-+
25-21
]25."-
Reset
Reset
25-21
IR""
25·21
Reset
25·21
IReset
j 25-21~
Reset
-t
25 - 22
I
Revest
25-22
Revest
25-23
- -
Reset
25- 26
---l
Reset
25-26
Reset
1
25. 2 6
I
Revest
25·26
Reset
25·26
25-15
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