Toyota Supra 1990 Manual page 294

FI-120
EFI SYSTEM - Electronic Control System
CONTINUED FROM PAGE FI-119
CD
®
Repair the relevent diagnostic code.
Malfunction code(s)
(ex. code 21, code 25 and code 26)
Read and record diagnostic codes (See pages F 1-27, 28)
Normal code, code 21,
code 25 and code 26
Disconnect terminals TEl and El of the check connector,
and maintain engine at 2,500 rpm.
1
Measure voltage between terminals VFl and El.
OV
5V
I
Disconnect the PCV hose.
I
I
Measure voltage between terminals VF
1
and E
1.
I
OV
More than 0 V
(
Repair (Over rich)
Disconnect the water temp. sensor connector and
connect resistor with resistance of 4 - 8 KQ or
another coded water temp. sensor.
Connect terminals TEl and El of the check connector.
~
Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90 seconds. And maintain engine
speed at 2,500 rpm.
Measure voltage between terminals VFl and El.
OV 5V
Replace the oxygen sensor.
( Repair (Over lean)