FI SYSTEM DIAGNOSIS 4-77
– Between B/Br wire terminal and other terminal at HO2 sen-
sor coupler: infinity
• Voltage
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
– Between B wire or B/Br wire and ground: approx. 0 V
(When ignition switch is ON)
Is check result OK?
Step 2
HO2 sensor output voltage check
1) Connect the ECM couplers and HO2 sensor coupler.
2) Warm up the engine enough.
3) Insert the needle-point probes to the lead wire coupler.
4) Measure the HO2 sensor output voltage between the B wire
and B/Br wire, in idling condition.
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
Tester knob indication: Voltage (
)
HO2 sensor output voltage at idle speed:
0.4 V or less
(
+
terminal: B –
-
terminal: B/Br)
5) If OK, lift and support the fuel tank (
5-2) and pinch the
PAIR hose
1
with a proper hose clamp.
1
YES
Go to Step 2.
NO
Repair or replace the defective wire harness.
V
1
2
2
