Electronic Controlled Unit (Ecu) Inspection; Voltage At Ecu Wiring Connectors - Toyota 3F-E Repair Manual Supplement

Ohmmeter
0
0
e
+B
t
Terminals
STD Voltage
BATT
— E1
IG SW — El
1
M-REL — El
+B (+B1) — El
I DL — E2
VC—E2
0.1 — 1.0
VTA — E2
VC—E22
0.02 — 0.08
VS — E22
0.3 — 1.0
EFI SYSTEM — Electronic Control System
3. INSPECT HEATER RESISTANCE OF OXYGEN
HT
F12749
Electronic Controlled Unit (ECU)
I NSPECTION OF ECU
1. INSPECT VOLTAGE OF ECU
Check the voltage between each terminal of the wiring
connectors.
HINT:
• Perform all voltage measurements with the connectors
• Verify that the battery voltage is 11 V or more when the

Voltage at ECU Wiring Connectors

-14
4 — 6
4-6
Ignition switch ON
4 — 5
-6
4 — 5
Ignition switch ON
2-4
Idling
3,000 rpm
SENSOR
Using an ohmmeter, measure the resistance between the
terminal + B and HT.
Resistance (Cold): 5.1 — 6.3 Q
If the resistance is not as specified, replace the sensor.
HINT: The EFI circuit can be checked by measuring the
resistance and voltage at the wiring connectors of the
ECU.
• Turn the ignition switch ON.
• Measure the voltage at each terminal.
connected.
ignition switch is ON.
Condition
Ignition switch ON
Throttle valve open
Throttle valve fully closed
Throttle valve fully open
Measuring plate fully closed
Measuring plate fully open
FI-77