Toyota MR2 1988 Repair Manual page 251

EFI SYSTEM - Troubleshooting EFI Electronic Circuit with Volt/Ohmmeter
Fl-55
No. Terminals Trouble
Condition STD Voltage
6
W-E1
No voltage
No trouble ("CHECK ENGINE" warning
9- 14V
light off) and engine running.
ECU
Fuse
-J"'"""
w
GAUGE 7.5A
"CHECK ENGINE"
Warning Light
Combination Meter
E1
"::~
F10728
CD
G)
No voltage between ECU terminals Wand El.
(Idling)
®Check that there is voltage between ECU terminal W and
body ground.
NO
!OK
@Check wiring between ECU terminal E 1
3 ground.
and body
!OK
!BAD
Try another ECU.
Repair or replace.
Check GAUGE fuse (7.5 AI and
"CHECK ENGINE" warning light.
OK
!BAD
l
Repair or replace.
3
!
Fuse blows again
Check wiring between ECU
BAD
Repair or replace.
terminal W and fuse.
FI0311