Toyota Supra 1990 Manual page 224

FI-50
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
FI2944
ECU
Voltmeter
~~~~~~~~~~~~lJ
CLJ
FI2911
Symbol Terminal Name
Symbol
EOl POWER GROUND G2
E02 POWER GROUND Gl
No.l0 INJECTOR (No.1 and
6)
NE
NO.30 INJECTOR (No.4 and 5) El
No.20 INJECTOR (No.2 and 3)
VF
STJ COLD START INJECTOR
G8
HT
OXYGEN SENSOR HEATER OIL
- -
TEl
VSV2 VSV (FPU) OX
-
-
-
EGR VSV (EGR) KNKl
-
- KNK2
ISCl ISC MOTOR NO.1 COl L THW
IGT IGNITER
IDL
ISC2 ISC MOTOR NO.2 COIL THA
IGDA IGNITER
VTA
ISC3 ISC MOTOR NO.3 COIL
KS
IGDB
IGNITER
-
ISC4 ISC MOTOR NO.4 COIL VC
-
-
E2
IGF
IGNITER STA
NIC
*ITHG EGR GAS TEMP. SENSOR
(NSW)
ECU Terminals
tru
'1.t"
lJU
E011
~3'1 ~3'1
HT
Iv~vIEG~ l~cll~cll~c 11~,r
IGFI G21 NE
E021~3'ISTJI
- 1 - I - IIGTIIGD4'GDBI-
f
H
q
G1 1 E1
EFI SYSTEM CHECK PROCEDURE
PREPARATION
(a) Disconnect the connectors from the ECU.
(b) Remove the locks as shown in the illustration so that
the tester probe(s) can easily come in.
NOTICE: Pay attention to sections "A" and "8" in the
illustration which can be easily broken.
(c) Reconnect the connectors to the ECU.
HINT:
• Perform all voltage measurements with the connectors
connected.
• Verify that the battery voltage is 11 V or more when the
ignition switch is in "ON" position.
Using a voltmeter with high impedance (10 kON minimum),
measure the voltage at each terminal of the wiring con-
nectors.
Terminals of ECU
Terminal Name Symbol Terminal Name
CAM POSITION SENSOR
AIC
AIC COMPRESSOR
CAM POSITION SENSOR
*2 LP
HEADLIGHT RELAY
CAM POSITION SENSOR SPD SPEED SENSOR
COMPUTER GROUND
*3ECT ECT COMPUTER
CHECK CONNECTOR
*2 DFG
DEFOGGER RELAY
CAM POSITION SENSOR Ll TEMS COMPUTER
OIL PRESSURE SWITCH FC
CIRCUIT OPENING RELAY
CHECK CONNECTOR L2 TEMS ECU COMPUTER
OXYGEN SENSOR
FP FUEL PUMP RELAY
-
L3 TEMS COMPUTER
KNOCK SENSOR W WARNING LIGHT
KNOCK SENSOR TIL TURBO INDICATOR
WATER TEMP. SENSOR M-REL EFI MAIN RELAY (COIL)
THROTTLE POSITION SENSOR
- -
AIR TEMP. SENSOR
-
-
THROTTLE POSITION SENSOR
-
-
AIR FLOW METER IG SW IGNITION SWITCH
-
+Bl EFI MAIN RELAY
AIR FLOW METER
BATT
BATTERY
THROTTLE POSITION SENSOR
SENSOR GROUND +B EFI MAIN RELAY
STARTER SWITCH
*1 California vehicles only
CLUTCH SWITCH (MIT)
*2 MIT only
NEUTRAL START SWITCH (AIT)
*3
AIT only
1.1
'1r
1.1
ruu
'U'
lJU
VF 101 LI OX I
K~KirHV\frH~
KS I VC
ST
AiA/CISPDIDF~
FC
I
FP
I
w
~E
II - I
~~ ~An
GeITE11-1K~KI'DLtvT.oj
-IE2 ,.:'~~,I
LP IECTj L1 I L2 , L31T1 LI - I - 1+811 +8
FI2796