With CONSULT - Screen Terms

ON BOARD DIAGNOSIS LOGIC
ECM monitors the switching frequency ratio of front and rear heated oxygen sensors.

A three way catalyst with high oxygen storage capacity will indicate a low switching frequency of rear heated oxygen sensor As oxygen storage capacity decreases, the rear heated oxygen sensor switching frequency will increase.

When the frequency ratio of front and rear heated oxygen sensors approaches a specified limit value, the three way catalyst malfunction is diagnosed.


DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

CAUTION:
- Always drive vehicle at a safe speed.
- If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.









With CONSULT
(1) Start engine and warm it up to normal operating temperature.
(2) Set "MANU TRIG" and "HI SPEED", then select "FR O2 SEN-B1", "FR O2 SEN-B2", "RR O2 SENSOR", "FR O2 MNTR-B2", "FR 02 MNTR-B1", "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 SENSOR" is very less than that of "FR O2 SEN-B1" or "FR O2 SEN-B2" as shown below.

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

- This ratio should be less than 0.5.
- If the ratio is greater than 0.5, the three way catalyst is not operating properly.
- If the "FR O2 MNTR" does not indicate "RICH" and "LEAN" periodically more than 5 times within 10 seconds at step 3), perform TROUBLE DIAGNOSES FOR DTC P0133 first.
- If the result is NG, go to "DIAGNOSTIC PROCEDURE".
- If the result is OK, go to following step.

(5) Select "AUTO TRIG" in "DATA MONITOR" mode with CONSULT.
(6) Drive vehicle at a speed of approximately 84 to 96 km/h (52 to 60 MPH) with the following for at least 10 consecutive minutes.
(Drive the vehicle in an area where vehicle speed and accelerator pressure can be held steady and constant.)

M/T: 5th position
A/T: D position ("OD" ON)

If the result is NG, go to "DIAGNOSTIC PROCEDURE".

(7) Select "SRT STATUS" in "DTC CONFIRMATION" mode with CONSULT.
(8) Verify that "CATALYST" is "CMPLT".
If not "CMPLT", repeat the test from step 5).

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DIAGNOSTIC PROCEDURE