general information - Martin Nez

4-82 FI SYSTEM DIAGNOSISStep 2 (When indicating C44/P0135:)1) Connect the HO2 sensor coupler.2) Insert the needle pointed probe to the HO2 sensor coupler.3) Turn the ignition switch ON and measure the heater voltagebetween W wire and ground.4) If the tester voltage indicates the battery voltage, it is goodcondition.V Heater voltage: Battery voltage(+ W – - Ground)NOTE:Battery voltage can be detected only before starting the engine. 09900-25008: Multi-circuit tester set09900-25009: Needle pointed probe set Tester knob indication: Voltage ()Is the voltage OK?2YESNO• O/W or W wire open or shorted to ground, orpoor ‘\ connection.• Recheck each terminal and wire harness foropen circuit and poor connection.• If wire and connection are OK, intermittent troubleor faulty ECM.• Replace the ECM with a known good one, andinspect it again.• Open or short circuit in the W/B wire or O/Wwire.• Loose or poor contacts on the ECM coupler(Terminal \) or HO2 sensor coupler.ECM couplers (Harness side)5) After repairing the trouble, clear the DTC using SDS tool.(4-26)