Toyota MR2 1988 Repair Manual page 232

Fl-36
EFI SYSTEM - Troubleshooting EFI Electronic Circuit with Volt/Ohmmeter
No. Terminals Trouble Condition
STD Voltage
IDL- E2
Throttle valve open 10- 14
v
Ignition
Throttle valve fully closed
0.1-1.0
v
3
VTA- E2 No voltage
switch ON Throttle valve fully open 4-5V
vee-
E2
-
4-6V
ECU
Throttle Position Sensor
DE,
E21
I
E2
( t
~
\
IDL
IDL
VTA
v
Vee
VTA
vee
-
E1
-==- F10485
• IDL ....... E2
CD
There is no voltage between ECU terminals IDL and E2.
(IG S/W ON) (Throttle valve open}
®
Check that there is voltage between ECU terminal +B 1 or +B
and body ground. (IG S/W ON)
NO
OK
Check wiring between ECU terminal E1 and body
ground.
BAD
l
Repair or replace
Refer to No. 1
I
BAD
~
Repair or replace
(See page Fl-34)
I
OK
Fl0124
E2
@
Thickness Gauge
®
Check throttle position
I
BAD
sensor.
BAD
!OK
Repair or replace
Check wiring between ECU and
throttle position sensor. throttle position sensor.
~OK
Fl2706
Try another ECU
I