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TR–12
DIAGNOSTIC CODES (Cont'd)
Code
Number to blinks
.
No
"CHECK" engine
5
27*
31
32
41
41
42
43
52
53
71
51
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.
ENGINE TROUBLESHOOTING
*1
"CHECK"
System
Engine
Warning
Light
Sub–
oxygen
ON
Sensor
Signal
AIr Flow
Meter
ON
Signal
Air Flow
ON
Meter
Signal
Throttle
Position
3
ON
ON *
Sensor
Sensor
Signal
Vehicle
Speed
OFF
Sensor
Signal
Starter
OFF
Signal
Knock
ON
Sensor
Signal
Knock
Control
ON
Signal
EGR
System
ON
Malfuncti
on
Switch
OFF
Condition
Signal
–
Diagnosis System
Diagnosis
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
6
detection logic) *
At idling, open or short detected
continuously for 0.5 sec. or more in
the air flow meter circuit.
Open or short detected continously
for 0.5 sec. or more in air flow me-
ter circuit.
Open or short detected in throttle
position sensor signal (VTA) for 0.5
sec. or more.
IDL contact is ON and VTA output
exceeds 1.45 V.
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.
Starter signal (STA) is not input to
ECU even once until engine reach-
es 800 rpm or more when crank-
ing.
With engine speed between 1,600
rpm – 5,200 rpm, signal from
knock sensor is not input to ECU
for 6 revolution. (KNK)
Engine speed is between 650 rpm
and 5,200 rpm and engine control
computer (for knock control) mal-
function is detected.
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 ve
hicle is driven for 90 seconds.
*6
(THG) (2 trip detection logic)
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.
Trouble Areas
Short or open in
sub–oxygen sensor circuit
Sub–oxygen sensor
ECU
Open (VC) or short (VC–E2)
in air flow meter circuit
Air flow meter
ECU
Open (E2) or short (VS–VC)
in air flow meter circuit
Air flow meter
ECU
Open or short in throttle
position sensor circuit
Throttle position sensor
Throttle position sensor
ECU
Open or short in vehicle
speed sensor circuit
Vehicle speed sensor
ECU
Open or short in starter
signal circuit
Open or short in IG SW
circuit
ECU
Open or short in knock
sensor circuit
Knock sensor (looseness
etc.)
ECU
ECU
Open in EGR gas temp.
sensor circuit
EGR or BVSV vacuum hose
disconnected, valve stuck
Clogged EGR gas passage
ECU
A/C switch circuit
Throttle position sensor IDL
circuit
Neutral start switch circuit
Accelerator pedal, cable
ECU
2
*
Memory
O
O
O
O
O
O
O
O
X
O
X
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