Toyota MR2 1988 Repair Manual page 247

EFI SYSTEM - Troubleshooting EFI Electronic Circuit with Volt/Ohmmeter Fl-51
No. Terminals Trouble Condition STD Voltage
IDL- E2 Throttle valve open
M/T
4-5V
A/T 10- 14 V
3 No voltage
Ignition Throttle valve fully closed 0.1 - 1.0
v
VTA- E2
switch ON
Throttle valve fully open 4-5V
VC- E2
-
4-6V
ECU
Throttle Position Sensor
E2
r=
E21
{ -!.
\ IDL
E2
JVTA
IDL
\
I
Vee
VTA
VC
,......- E1
~
fl0485
• 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
F11257
Check wiring between ECU terminal E 1 and body
ground.
BAD
J
Repair or replace
I
Refer to No. 1 I
BAD
~
Repair or replace
(See page Fl-49)
I
OK
(See page Fl-98)
@
Check throttle position
I
BAD
sensor.
®
BAD
iOK
Repair or replace
Check wiring between ECU and
throttle position sensor. throttle position sensor. Vccil
VTA IDL
Thickness Gauge e,
!
OK
Try another ECU
I
Fl2986