Toyota Supra 1990 Manual page 296

FI-122
EFI SYSTEM - Electronic Control System
7M-GE
7M-GTE
ECU
Voltmeter
~~~~~(t~~~~~~~D~
CY:J
Terminals
BATT
-
E1
IG SW
-
E1
M-REL
-
E1
+B(+B1)
-
E1
IDL
-
E2
(7M-GE)
IDL - E2
(7M-GTE)
VC - E2
VTA - E2
*1
VS - E2
Body
*2
KS _
ground
*2
VC _ Body
ground
FI0299
FI2911
STD Voltage
10 - 14
10 - 14
4-6
4-6
0.1 - 1.0
4-5
3.7 - 4.3
0.2 - 0.5
2.3 - 2.8
1.0 - 2.0
4-6
2-4
4-6
Electronic Controlled Unit (ECU)
INSPECTION OF ECU
HINT: The EFI circuit can be checked by measuring the
resistance and voltage at the wiring connectors of the ECU.
1. (7M-GTE)
PREPARATION
(See page FI-50)
2. INSPECT VOLTAGE OF ECU
Check the voltage between each terminal of the wiring con-
nectors.
• Turn the ignition switch ON.
• Measure the voltage at each terminal.
HINT:
• Perform all voltage measurements with the connectors
connected .
• Verify that the battery voltage is 11V or more when the
ignition switch is ON.
Voltage at ECU Wiring Connectors
Condition
-
Ignition SW ON
Throttle valve open
Throttle valve open
Ignition SW ON
-
Throttle valve fully closed
Throttle valve fully open
Measuring plate fully closed
Ignition SW ON
Measuring plate fully open
Idling
3,000 rpm
Ignition SW ON
Cranking or running
Ignition SW ON