With CONSULT

ON-BOARD DIAGNOSIS LOGIC OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the three way catalyst. During this check, a DTC might not be confirmed.
1) Start engine and warm it up sufficiently.




2) Set "MANU TRIG" and "HI SPEED", then select "FR O2 SENSOR", "RR O2 SENSOR", "FR O2 MNTR", "RR O2 MNTR" in "DATA MONITOR" mode with CONSULT.
3) Touch "RECORD" on CONSULT screen with engine speed held at 2,000 rpm constant under no load.
4) Make sure that the switching frequency between "RICH" and "LEAN" of "RR O2 MNTR" is very less than that of "FR O2 MNTR".

Switching frequency ratio =
Rear heated oxygen sensor switching frequency / Front heated oxygen sensor switching frequency

This ratio should be less than 1/2.

If the ratio is greater than the above value, the three way catalyst is not operating properly.

NOTE: If the "FR O2 MNTR" does not indicate "RICH" an "LEAN" periodically more than 5 times for 10 seconds at step 3, perform TROUBLE DIAGNOSIS FOR DTC P0130 (Front heated oxygen sensor first.