Heated Oxygen Sensor 1

With CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Select "MANU TRIG" and adjust "TRIGGER POINT" to 100% in "DATA MONITOR" mode with CONSULT-II.
3. Select "HO2S1 (B1)/(B2)" and "HO2S1 MNTR (B1)/(B2)".
4. Hold engine speed at 2,000 RPM under no load during the following steps.
5. Touch "RECORD" on CONSULT-II screen.
6. Check the following.
   • "HO2S1 MNTR (B1)/(B2)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" more than 5 times in 10 seconds.

     5 times (cycles) are counted as shown. See Figure and Figure .

   • "HO2S1 (B1)/(B2)" voltage goes above 0.6V at least once.
   • "HO2S1 (B1)/(B2)" voltage goes below 0.3V at least once.
   • "HO2S1 (B1)/(B2)" voltage never exceeds 1.0V.

Without CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 114 [HO2S1 (B1) signal] or 115 [HO2S1 (B2) signal] and ground. See Figure.
3. Check the following with engine speed held at 2,000 RPM constant under no load.
   • The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than 5 times within 10 seconds.
   • The maximum voltage is over 0.6V at least 1 time.
   • The minimum voltage is below 0.3V at least 1 time.
   • The voltage never exceeds 1.0V.

     1 time: 0 - 0.3V to 0.6 -1.0V to 0 - 0.3V

     2 times: 0 - 0.3V to 0.6 - 1.0V to 0 - 0.3V to 0.6 - 1.0V to 0 -0.3V