Toyota Supra 1990 Manual page 201

EFI SYSTEM - Diagnosis System
FI-27
DIAGNOSTIC CODES (Cont'd)
Code
Number of
See
No.
"CHECK" engine System
Diagnosis Trouble area
page
blinks
(Calif.)
(1) When air-fuel ratio feed-
back compensation
value or adaptive con-
•
Injector circuit
trol value continues at
•
Injector
the upper (lean) or low-
•
Fuel line pressure
er (rich) limit renewed
for a certain period of
•
Air flow meter
Air-Fuel Ratio
-----.l1IlJ1IUU
time.
•
Air intake system
25 Lean
(2) When air-fuel ratio feed-
-
•
Oxygen sensor circuit
Malfunction
back comensation value
•
Oxygen sensor
of adaptive control
•
Ignition system
value feedback frequen-
cy is abnormally high
•
Water temp. sensor
during feedback con-
•
ECU
dition.
(3) When marked variation
FI2562
is detected in engine
revolutions for each
cylinder during idle
switch on and feedback
condition.
HINT:
For conditions (2)
•
Injector circuit
and (3), since neither a lean
•
Injector
(Code No.25) nor a rich
•
Fuel line pressure
Air-Fuel Ratio
(Code No.26) diagnosis dis-
•
Air flow meter
~
played consecutively.
26
Rich
(Others)
•
Cold start injector
-
Malfunction
When air-fuel ratio feedback
•
Oxygen sensor circuit
correction value or adaptive
•
Oxygen sensor
control value continues at
•
Water temp. sensor
the upper (lean) or lower
(rich) limit for a certain peri-
•
ECU
od of time or adaptive con-
trol value is not renewed for
FI2563
a certain period of time.
Open or short circuit in
•
SUb-oxygen sensor circuit
Sub-Oxygen
sUb-oxygen sensor signal
•
Sub-oxygen sensor
Sensor Signal
(OX2).
•
ECU
*2
SUb-oxygen sensor
27 ~
•
-
Sub-Oxygen Open or short circuit in heater circuit
Sensor sUb-oxygen sensor heater
•
Sub-oxygen sensor
Heater
signal (HT). heater circuit
FI2617
•
ECU
(7M-GE)
Open circuit in VC signal or
short circuit between VS
Air flow meter circuit
•
31
~
Air Flow and E2 when idle contacts
Air flow meter FI-38
•
Meter Signal are closed.
•
ECU
(7M-GTE)
Open or Short circuit in air
FI1612
flow meter signal.
*3
•
Air flow meter circuit
~
Air Flow Open circuit in E2 or short
32
•
Air flow meter
FI-57
Meter Signal circuit between VC and VS.
ECU
FI1613
•