Toyota 2VZ-FE Manual page 248

DIAGNOSTIC CODES
Code Number to blinks
.
No "CHECK" engine
—
12
13
14
16
21 21
22
24
25
26
ENGINE TROUBLESHOOTING
*1
"CHECK"
System Engine
Warning
Light
Output when no other code is re-
Normal –
corded
No G or NE signal is input to the
RPM
ECU for 2 sec. or more after STA
ON
Signal
turns ON.
NE signal not input to ECU for 50
RPM
ON msec. or more when engine
Signal
speed is 1,000 rpm or more.
Ignition IGF signal from igniter is not input
ON
Signal to ECU for 6 consecutive ignition.
ECT
Normal signal is not output from
Control
ON
ECU of ECT.
Signal
(1) Open or short in heater ci-
cuit of main oxygen sensor
for 0.5 sec. or more. (HT)
(2) At normal driving speed
(below 60 mph and engine
Main
s eed is above 1,500 r m), speed is above 1,500 rpm),
Oxygen Oxygen
ON ON
amplitude of oxygen sen-
Sensor
Signal sor signal (OX1) is reduced
to between 0.35 – 0.70 V
continuously for 60 sec. or
more.
(2 trip detection logic)*
Water
Open or short to water temp.
Temp.
sensor circuit for 0,5 sec. or more
ON
Sensor
(THW).
Signal
Intake
Open or short in intake air temp.
Air
3
Temp. ON* sensor circuit for 0,5 sec. or more
Sensor (THA).
Signal
(1) Oxygen sensor ouput is
less than 0.45 V for at least
90 sec. when oxygen sen-
Air–fuel
sor is warmed up (racing at
Ratio
2,000 rpm).
Lean ON
Malfunc-
tion
4
(2) *
back correction value or
adaptive control value con-
tinues at the u tinues at the upper (lean) or
lower (rich) limit for a certain l
period of time or adaptive
control value is not re-
newed for a certain period
of time.
Air–fuel
Ratio
4
(3) *
Rich ON
is detected in engine revo-
Malfunc-
lutions for each cylinder
tion
during idle switch on and
feedback condition.
(2 trip detection logic)*
– Diagnosis System
Diagnosis
6
When air–fuel ratio feed-
er (lean) or
( i h) li i f i
When marked variation
6
Trouble Areas
—
Open or short in NE, G Circuit
Distributor
Open or short in STA circuit
ECU
Open or short in NE circuit
Distributor
ECU
Open or short in IGF or IGT
circuit from igniter to ECU
Igniter
ECU
ECU
Open or short in heater circuit
of main oxygen sensor
Main oxygen sensor heater
ECU
Open or short in main oxygen
sensor circuit
Main Oxygen sensor
ECU
Open or short in water temp.
sensor circuit
Water temp. sensor
ECU
Open or short in intake air
temp. sensor circuit
Intake air temp. sensor
ECU
Engine ground bolt loose
Open in E1 circuit
Open in injector circuit
Fuel line pressure
(Injector blockage, etc.)
Open or short in oxygen
sensor circuit
Oxygen sensor
Ignition system
Water temp. sensor
Air flow meter (air intake)
Foreign object caught in valve
ECU
Engine ground bolt loose
Open in E1 circuit
Short in injector circuit
Fuel line pressure
(Injector blockage, etc.)
Open or short in cold start
injector circuit
Cold start injector
Open or short in oxygen
sensor circuit
Oxygen sensor
Water temp. sensor
Air flow meter
Compression pressure
Foreign object caught in valve
ECU
TR–11
2
*
Memory
—
O
O
O
X
O O
O
O
O
O