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FI SYSTEM DIAGNOSIS 4-87
“C44” (P0130/P0135) HO2 SENSOR (HO2S) CIRCUIT MALFUNCTION
(For E-02, 19)
INSPECTION
Step 1 (When indicating C44/P0130:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the HO2 sensor for loose or poor contacts.
If OK, then check the HO2 sensor lead wire continuity.
4) Disconnect the HO2 sensor coupler
5) Check the continuity between W/G wire A and ground.
6) Also, check the continuity between W/G wire A and B/Br wire
B. If the sound is not heard from the tester, the circuit condi-
tion is OK.
09900-25008: Multi-circuit tester set
Tester knob indication: Continuity test ()
DETECTED CONDITION POSSIBLE CAUSE
C44
(P0130)
HO2 sensor output voltage is not input
to ECM during engine operation and
running condition.
(Sensor voltage < 0.55 V)
• HO2 sensor circuit open or shorted to ground.
• Fuel system malfunction.
• ECM malfunction.
C44
(P0135)
The heater can not operate so that
heater operation voltage is not supplied
to the oxygen heater circuit.
• Battery voltage supply to the HO2 sensor.
ECM
Side-stand
relay
Ignition
switch
Engine stop
switch
O/W
W
Gr
B
W
B/Br
W/G
W/B
HO2 sensor
OX
OXH
E2
To GP
switch
1
1
!