Toyota 2VZ-FE, Manual

Page: 249 / 324

DIAGNOSTIC CODES (Cont’d)
Code
No
.
Number to blinks
“CHECK” engine
System
*1
“CHECK”
Engine
Warning
Light
Diagnosis Trouble Areas
*
2
Memory
27*
5
Sub–
oxygen
Sensor
Signal
ON
When sub–oxygen sensor is
warmed up apply acceleration with
the throttle fully open for 2 sec-
onds, output of main oxygen sen-
sor is 0.45 V or more (rich) and
output of sub–oxygen sensor is
0.45 V or less (lean). (OX2) (2 trip
detection logic) *
6
D
Short or open in
sub–oxygen sensor circuit
D
Sub–oxygen sensor
D
ECU
O
31
AIr Flow
Meter
Signal
ON
At idling, open or short detected
continuously for 0.5 sec. or more in
the air flow meter circuit.
D
Open (VC) or short (VC–E2)
in air flow meter circuit
D
Air flow meter
D
ECU
O
32
Air Flow
Meter
Signal
ON
Open or short detected continously
for 0.5 sec. or more in air flow me-
ter circuit.
D
Open (E2) or short (VS–VC)
in air flow meter circuit
D
Air flow meter
D
ECU
O
41
Throttle
Position
Sensor
ON *
3
Open or short detected in throttle
position sensor signal (VTA) for 0.5
sec. or more.
D
Open or short in throttle
position sensor circuit
D
Throttle position sensor
O 41
Sensor
Signal
ON
IDL contact is ON and VTA output
exceeds 1.45 V.
D
Throttle position sensor
D
ECU
O
42
Vehicle
Speed
Sensor
Signal
OFF
SPD signal is not input to the ECU
for at least 8 seconds during high
load driving with engine speed be-
tween 2,500 rpm and 4,500 rpm.
D
Open or short in vehicle
speed sensor circuit
D
Vehicle speed sensor
D
ECU
O
43
Starter
Signal
OFF
Starter signal (STA) is not input to
ECU even once until engine reach-
es 800 rpm or more when crank-
ing.
D
Open or short in starter
signal circuit
D
Open or short in IG SW
circuit
D
ECU
O
52
Knock
Sensor
Signal
ON
With engine speed between 1,600
rpm – 5,200 rpm, signal from
knock sensor is not input to ECU
for 6 revolution. (KNK)
D
Open or short in knock
sensor circuit
D
Knock sensor (looseness
etc.)
D
ECU
O
53
Knock
Control
Signal
ON
Engine speed is between 650 rpm
and 5,200 rpm and engine control
computer (for knock control) mal-
function is detected.
D
ECU
X
71
EGR
System
Malfuncti
on
ON
With engine warmed up and EGR
operation possible, code is dis-
played when EGR gas temp. sen-
sor is 55
°
C (131
°F) for M/T, 60°C
(140°F) for ECT or less when veĆ
hicle is driven for 90 seconds.
(THG) (2 trip detection logic)
*6
D
Open in EGR gas temp.
sensor circuit
D
EGR or BVSV vacuum hose
disconnected, valve stuck
D
Clogged EGR gas passage
D
ECU
O
51
Switch
Condition
Signal
OFF
Displayed when A/C is ON, IDL
contact OFF or shift position in “R”,
“D”, “2” or “1” renges with the
check terminals E1 and TE1 con-
nected.
D
A/C switch circuit
D
Throttle position sensor IDL
circuit
D
Neutral start switch circuit
D
Accelerator pedal, cable
D
ECU
X
REMARKS:
*
1
: ”ON” displayed in the diagnosis mode column indicates that the ”CHECK” Engine Warning Light is lighted up when
a malfunction is detected.
”OFF” indicates that the ”CHECK” does not light up during malfunction diagnosis, even if a malfunction is detected.
*
2
: ”O” in the memory column indicates that a diagnostic code is recorded in the ECU memory when a malfunction occurs.
”X” indicates that a diagnostic code is not recorded in the ECU memory even if a malfunction occurs.
Accordingly, output of diagnostic results is performed with the IG switch ON.
*
3
: The ”CHECK” Engine Warning Light light up only for California specifications if malfunction occurs.
*
4
: No. (2) and (3) in the diagnostic contents of codes No. 25 and 26 apply to California specification vehicles only, while
(1) applies to all models.
*
5
: Codes 27 and 71 are used only for California specifications.
TR–12
– ENGINE TROUBLESHOOTING Diagnosis System