4-50 FI SYSTEM
White
White
Ω
V
8
terminal
3
3
4
No
Ye s
Ye s
Replace the HO
2 sensor with
a new one.
No
Ye s
Replace the HO
2 sensor with
a new one.
4
Turn the ignition switch OFF.
Disconnect the HO
2 sensor coupler.
Check the resistance between the terminals (White –
White) of the HO
2 sensor.
Check the fuel supply system,
if the system is OK, replace
the ECM with a new one, and
inspect it again.
Turn the ignition switch OFF.
Insert the copper wire to the ECM lead wire coupler
8
terminal (Heater circuit).
Turn the ignition switch ON and measure the heater
voltage between
8
terminal and ground.
If the tester voltage indicates the battery voltage for few
seconds it is good condition.
NOTE:
* Temperature of the sensor affects resistance value
largely.
* Make sure that the sensor heater is at correct tempera-
ture.
z
09900-25008: Multi circuit tester set
t
Tester knob indication: Resistance (Ω)
;
HO
2 sensor resistance: 4 – 5 Ω (at 23 ˚C/73.4 ˚F)
;
Heater voltage: Battery voltage
(
8
terminal – Ground)
NOTE:
Battery voltage can be detected only during few seconds
after ignition switch is turned ON.
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
-
)
ECM coupler
Black, W/Gr, White, W/B, Gray, B/Br or O/W wire open or
shorted to ground, or poor
8
,
E
,
N
or
X
connection.
(
:
4-22)
If wire and connection are OK, intermittent trouble or faulty
ECM.
Recheck each terminal and wire harness for open circuit
and poor connection. (
:
4-5)
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