Troubleshooting With Volt/Ohmmeter (7M-Gte - Toyota Supra 1990 Manual

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
FI-49
TROUBLESHOOTING WITH
VOLT/OHMMETER (7M-GTE)
HINT: The following troubleshooting procedures
are designed for inspection of each separate sys-
tem, therefore the procedure may vary somewhat.
However, troubleshooting should be performed
referring to the inspection methods described in this
manual.
Before beginning inspection, it is best to first make
a simple check of the fuses, fusible links and con-
dition of the connectors.
The following troubleshooting procedures are based
on the supposition that the trouble lies in either a
short or open circuit in a component outside the
computer or a short circuit within the computer.
If engine trouble occurs even though proper oper-
ating voltage is detected in the computer connec-
tor, then it can be assumed the computer is faulty
and should be replaced.
LOCATION OF FUSES AND FUSIBLE LINKS
Fusible Link
2.0L
Fuse
GAUGE 7.5A
No.1 Junction Block
mmmrw
Qbffffil
OtEffiHB
O()
~..L.-
DOD
No.2
Junction Block
00000
DODD
tffiBE3
Fusible Link
AM140A
Fuse
IGN 7.5 A
EFI Main Relay
Fusible Link Fuse
AM230A EFI15A
FI3705