Quote:
Originally Posted by 00GTP4ME
What is a "drive cycle?"
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See the thread below going back to 2007.
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Quote:
Originally Posted by BNaylor
I would take the DTC at face value and replace the CAT convertor. The CAT has deteriorated and operating below the required threshold when the PCM looks at both the front and rear 02 sensors to make a determination. Plus there are alot of variables as to when that specific DTC will set so it may not set every drive cycle or on a specific trip. See some engine parameters below:
- Engine speed is 1,410- 3,100 rpm.
- Calculated TWC temperature in PCM is above 574 °C {1065 °F}.
- Calculated load is 15- 50% (at 2,000 rpm)
On my Actron scanner DTC P0420 shows up as a pending code. From what I understand the SES/CEL MIL illuminates if the PCM detects the above malfunction conditions in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. DIAGNOSTIC MONITORING TEST RESULTS and PENDING CODE are stored if PCM detects the above malfunction condition during first drive cycle.
Hope the info helps.
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