With CONSULT

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the front heated oxygen sensor circuit. During this check, a DTC might not be confirmed.
1) Start engine and warm it up sufficiently.




2) Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT, and select "FR O2 SENSOR" and "FR O2 MNTR".
3) Hold engine speed at 2,000 rpm under no load during the following steps.
4) Touch "RECORD" on CONSULT screen.




5) Check the following.
- "FR O2 MNTR" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds.

5 times (cycles) are counted as shown below:

cycle 1 2 3 4 5
FR O2 MNTR R-L-R-L-R-L-R-L-R-L-R
R = "FR O2 MNTR", "RICH"
L = "FR O2 MNTR", "LEAN"

- "FR O2 SENSOR" voltage goes above 0.6 V at least once.
- "FR O2 SENSOR" voltage goes below 0.35 V at least once.
- The voltage never exceeds 1.0 V.