Toyota Supra 1990 Manual page 234

FI-60 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
No. Terminals Trouble
Condition STD Voltage
5
THA - E2
No voltage
Ignition switch
I
Intake air temperature 20°C (6SoF) 1-3V
ON
ECU
+8 (+B1)
~-VV\A~
...
.,
THA
.THA
l--./' v
E2
~
E2
E1
Air Temp. Sensor
(Air Flow Meter)
--=-
FI3708
CD CD
There is no voltage between ECU terminals THA and E2.
(lG SW ON)
®
Check that there is voltage between ECU terminal +B (+B1) and
body ground. (lG SW ON)
OK
~
NO
Refer to No.1.
FI2767 (See page FI-54)
ECU
Voltmeter
~~~~~~
Check wiring between ECU terminal E1 and body ground.
I
OK
~
BAD
®
Check air temp. sensor.
(See page F
1-96)
Repair or replace.
BAD
~
OK
FI2757
Replace air flow Check wiring between ECU and
meter.
air temp. sensor.
Ohmmeter
Air Flow Meter
®
JOK
~
BAD
II.
o
Try another ECU. Repair or replace.
I
o
o
FI3825