Without 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 voltmeters probes between ECM terminals (46) (front heated oxygen sensor signal) and (43) (engine ground), and ECM terminals (52) (rear heated oxygen sensor signal) and (43) (engine ground).
3) Keep engine speed at 2,000 rpm constant under no load.
4) Make sure that the voltage switching frequency (high & low) between ECM terminals (52) and (43) is much less than that of ECM terminals (46) and (43).

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

This ratio should be less than 1/2.

If the ratio is greater than the above value, it means three way catalyst does not operate properly.

NOTE: If the voltage at terminal (46) does not switch periodically more than 5 times for 10 seconds at step 3, perform TROUBLE DIAGNOSIS FOR DTC P0130 (Front heated oxygen sensor) first.