Toyota MR2 1988 Repair Manual page 252

Fl-56
EFI SYSTEM - Troubleshooting EFI Electronic Circuit with Volt/Ohmmeter
No.
TermintUs
Trouble Condition 5TD voltage
7
THA- E2
No voltage
Ignition switch
Intake air temperature 20°C
1-3V
ON
(68°F)
ECU
+B
(+B1)
E2
E2
(
~
~
~
~
THA
THA
Air Temp. Sensor
E1
(In Air Flow Meter)
_,__
-
Fl1272
CD
CD
There is no specified voltage between ECU terminals THA and
E2. (IG 5/W ON)
®Check that there is voltage between ECU terminal +B1 or +B
and body ground.
(IG
5/W ON)
OK
NO
@Check air temp. sensor.
Refer to No. 1 .
(See page Fl-49)
BAD
tOK
Replace air
J
l
~heck
wiring between ECU and
temp. sensor. a1r temperature sensor.
®
!
OK
BAD
Try another ECU.
Repair or replace
wiring.
Air Flow Meter
@
(See page Fl-94)
Fl1253