Ohmmeter
0
0
e
t
+B
HT
F12749
EFI SYSTEM — Electronic Control System
FI-77
3. INSPECT HEATER RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
te B and HT.
Resistance (Cold): 5.1 — 6.3 Q
If the resistance is not as specified, replace the sensor.
Electronic Controlled Unit (ECU)
I NSPECTION OF ECU
HINT: The EFI circuit can be checked by measuring the
resistance and voltage at the wiring connectors of the
ECU.
1. INSPECT VOLTAGE OF ECU
Check the voltage between each terminal of the wiring
connectors.
• 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 11 V or more when the
ignition switch is ON.
Voltage at ECU Wiring Connectors
Terminals
STD Voltage
Condition
BATT
— E1
1
-14
IG SW — El
Ignition switch ON
M-REL — El
+B (+B1) — El
I DL — E2
4 — 6
Ignition switch ON
Throttle valve open
VC—E2
4-6
VTA — E2
0.1 — 1.0
Throttle valve fully closed
4 — 5
Throttle valve fully open
VC—E22
-6
Ignition switch ON
VS — E22
4 — 5
Measuring plate fully closed
0.02 — 0.08
Measuring plate fully open
2-4
Idling
0.3 — 1.0
3,000 rpm
Summary of Contents for 3F-E
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