Toyota Supra 1990 Manual page 231

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
FI-S7
No. Terminals Trouble Condition STD Voltage
KS -
Body
Ignition SW ON 4-6V
3
ground
Cranking or running 2-4V
No voltage
VC-
Body
Ignition SW ON 4-6V
ground
ECU
Air Flow Meter
+B
(+B1)
VC
VC
~vv
KS
KS
E1
E1
c:::
~
-~
FI2560
ECU
CD
• KS - Body ground
Voltmeter
CD
There is no voltage between ECU terminals KS and body ground.
(IG SW ON)
o::::::J
®
Check that there is voltage between ECU terminal +B (+B1) and
body ground. (IG SW ON)
F13725
OK
~
NO
Refer to No.1.
®
(See page FI·54)
Voltmeter
@
Check wiring between ECU terminal E1 and body ground.
I
CY.::J
OK
~
BAD
i
FI2757
Check wiring between ECU and air
Repair or replace.
flow meter.
OK
T
BAD
@
Try another ECU.
I
I
Repair or replace.
Ohmmeter
[]LJ
0
0
0