Toyota Supra 1990 Manual page 229

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
FI-55
No. Terminals Trouble
Condition
STD voltage
IDL
-
E2
Throttle valve open
4-6V
Ignition
-
4-6V
2 VC
-
E2 No voltage
switch ON Throttle valve fully closed 0.1 -1.0 V
VTA
-
E2
Throttle valve fully open
3.2 - 4.2 V
ECU
Throttle Position Sensor
+B
(+81)
E2
E2
L
~
, IDL
JVTA
IDL
\
) VC
VTA
VC
,..-----<
E1
-=-
FI1366
CD
• IDL - E2
CD
There is no voltage between ECU terminals IDL and E2.
(lG SW ON) (Throttle valve open)
®
Check that there is voltage between ECU terminal +8 (+81)
and body ground. (lG SW ON)
NO
OK
FI2762
Check wiring between ECU terminal E1 and body
ground.
OK
BAD
Try another ECU.
I
Repair or replace.
Refer to No.1.
BAD
(See page FI-54)
Repair or replace.
OK
(See page FI-101)
DLJ
@
Check throttle position
I
BAD
sensor.
@
o
O,~
BAD
1
0K
Repair or replace Check wiring between ECU and
Ohmmeter
throttle position sensor. throttle position sensor.
!OK
Try another ECU.
FI2835