Toyota Supra 1990 Manual page 220

FI-46
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GEl
No. Terminals Trouble Condition
STD Voltage
11 A/C - E1 No voltage Air conditioning ON
10 - 14 V
ECU
To A/C
A/C
Amplifier
r
E1
-
FI4925
G)
There is no voltage between ECU terminals A/C and E1.
(Air conditioning ON)
G)
®
Check that there is voltage between ECU terminal AIC and
body ground.
NO
~OK
®
Check wiring between ECU terminal E1 and body
ground.
FI1255
i
OK
TBAD
I
Try another ECU.
I
Repai r or replace.
Voltmeter
Check that there is voltage between
l
BAD
Repair or replace.
amplifier terminal and body ground.
I
OK
FI1254
Check wiring between amplifier and
l
BAD
Repair or replace.
ECU terminal A/C.
I
®
FI0311