With CONSULT

OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the front oxygen sensor circuit. During this check, a Diagnostic Trouble Code (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 "FRO2 SENSOR" and "FRO2 MNTR".
3. Hold engine speed at 2,000 rpm under no load during the following steps.
4. Touch "RECORD" on CONSULT screen.




5. Make sure of 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 02 SENSOR" voltage goes above 0.6 volts at least once.
^ "FR 02 SENSOR" voltage goes below 0.35 volts at least once.