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FI SYSTEM DIAGNOSIS 4-89
Is the voltage OK?
6) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
Step 1 (When indicating C44/P0135:)
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 measure the HO2 sensor resistance.
4) Disconnect the HO2 sensor coupler and measure the resis-
tance between terminals.
HO2 heater resistance: 4.0 – 5.0 Ω at 23 °C (W – W)
NOTE:
* Temperature of the sensor affects resistance value largely.
* Make sure that the sensor heater is at correct temperature.
09900-25008: Multi-circuit tester set
Tester knob indication: Resistance (Ω)
Is the voltage OK?
5) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
YES
• W/G wire or B/Br wire open or shorted to
ground, or poor B or S connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO Replace the HO2 sensor with a new one.
When using the multi-circuit tester, do not storongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
ECM couplers (Harness side)
2
1
YES Go to Step 2.
NO Replace the HO2 sensor with a new one.
1