Toyota Supra 1990 Manual page 214

FI-40 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GE)
No. Terminals Trouble
Condition
STD Voltage
5 THA -
E2
No voltage
Ignition switch
ON
I
Intake air temperature 20 D C
(6S
D
F)
1-3V
Voltmeter
Ohmmeter
ECU
E2
THA
L---~>-~------------------------------------------OTHA
Air Temp. Sensor
(Air Flow Meter)
CD
FI1636
FI0312
Air Flow Meter
®
FI1253
'--~E1
_L...-
F11272
CD
There is no voltage between ECU terminals THA and E2.
(lG SW ON)
@
Check that there is voltage between ECU terminal +B (+B 1) and
body ground. (lG SW ON)
OK
~
NO
Refer to No.1.
(See page F
1-35)
Check wiring between ECU terminal E1 and body ground.
J
OK
~
BAD
®
Check air temp. sensor.
l
Repair or replace.
(See page F
1-94)
BAD
~
OK
Replace air flow
Check wiring between ECU and air
meter.
temp. sensor.
~
OK
i
BAD
Try another ECU.
1
Repair or replace.