Code P0420 - Cuased by SeaFoam? [Archive] - Toyota Forums

JSM1284

06-17-2008, 02:51 PM

P0420 - Catalyst System Efficiency Below Threshold (BANK1)

CIRCUIT DESCRIPTION

http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94853983
DTC Detection Conditionhttp://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94853994
The ECM (http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OD~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/101367125) observes the waveform of the heated oxygen sensor located behind the catalyst to determine whether the catalyst performance has deteriorated.
If the catalyst functions normally, the waveform of the heated oxygen sensor located behind the catalyst switches back and forth between rich and lean much more slowly.
When the waveform of the heated oxygen sensor located behind the catalyst alternates flutteringly between rich and lean, it indicates the catalyst performance has deteriorated.

http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94854009
CONFIRMATION ENGINE RACING PATTERN

Connect the OBD II scan tool or hand-held tester to the DLC (http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OD~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857209)3.
Start the engine and warm it up with all the accessories switched OFF until the water temperature is stable.
Race the engine at 2,500-3,000 rpm for about 3 minutes .
When racing the engine at 3,000 rpm for 2 seconds and 2,000 rpm for 2 seconds alternately, check the waveform of the heated oxygen sensor.Step 1 - 2http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94854011
Step 3 - 4http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94854015
INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.


Toyota Forums :: Toyota Nation > Toyota Passenger and Sports Car Forums > Camry and Solara Forum > Gen 5 & 6 > Code P0420 - Cuased by SeaFoam? PDA Code P0420 - Cuased by SeaFoam? rbarton 06-17-2008, 02:24 PM ... JSM1284 06-17-2008, 02:51 PM P0420 - Catalyst System Efficiency Below Threshold (BANK1) CIRCUIT DESCRIPTION http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94853983 DTC Detection Conditionhttp://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94853994 The ECM (http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OD~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/101367125) observes the waveform of the heated oxygen sensor located behind the catalyst to determine whether the catalyst performance has deteriorated. If the catalyst functions normally, the waveform of the heated oxygen sensor located behind the catalyst switches back and forth between rich and lean much more slowly. When the waveform of the heated oxygen sensor located behind the catalyst alternates flutteringly between rich and lean, it indicates the catalyst performance has deteriorated. http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94854009 CONFIRMATION ENGINE RACING PATTERN Connect the OBD II scan tool or hand-held tester to the DLC (http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OD~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857209)3. Start the engine and warm it up with all the accessories switched OFF until the water temperature is stable. Race the engine at 2,500-3,000 rpm for about 3 minutes . When racing the engine at 3,000 rpm for 2 seconds and 2,000 rpm for 2 seconds alternately, check the waveform of the heated oxygen sensor.Step 1 - 2http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94854011 Step 3 - 4http://library.motoralldata.com/alldata/MTRLIB~C36978~R0~OB0~P4R0H~N/0/86372027/89384388/89384397/89384399/34853741/34857029/34857030/34857663/122915129/103688830/120181541/94875036/94854015 INSPECTION PROCEDURE HINT: Read freeze frame data using the hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.