Toyota Supra 1990 Manual page 212

FI-38
EFI
SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GE)
No.
Terminals Trouble Condition STD Voltage
VC
-
E2
-
4-6V
VS E2
Ignition
Measuring plate fully closed
3.7 - 4.3 V
-
3
VS
-
E2 No voltage
SWON
Measuring plate fully open 0.2 - 0.5 V
VS
-
E2
Idling
-
2.3 - 2.8 V
VS
-
E2
3,000 rpm
-
1.0 - 2.0 V
ECU
+B
(+B1)
E2
E2
L
VS
VC
VS
VC
Air Flow Meter
E1
1
-
FI1269
CD
CD
There is no voltage between ECU terminals VC or VS and E2.
(lG SW ON)
®
Check that there is voltage between ECU terminal +B (+B 1) and
body ground. (lG SW ON)
OK
~
NO
Refer to No.1.
FI2444
(See page F
1·35)
Check wiring between ECU terminal E1 and body ground.
I
OK
~
BAD
@
Check air flow meter.
(See page F
1·94)
Repair or replace.
BAD
~
OK
Replace air flow
Check wiring between ECU and
meter.
air flow meter.
Air Flow Meter
@
~
OK
~
BAD
Ohmmeter
Try another ECU.
I
Repair or replace.
I
LlL]
o
o
o
FI1283