6-78
ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD
CIRCUIT DESCRIPTION
1. Heated oxygen sensor-1
2. Warm up three way catalytic converter
3. Three way catalytic converter
4. Heated oxygen sensor-2
5. To the sensor
ECM monitors oxygen concentration in the exhaust gas which has passed the three way catalytic converter by
HO2S-2.
When the catalyst is functioning properly, the variation cycle of HO2S-2 output voltage (oxygen concentration) is
slower than that of HO2S-1 output voltage because of the amount of oxygen in the exhaust gas which has been
stored in the catalyst.
Reference
Oscilloscope Waveforms
Engine running at
Closed loop condition
Fuel
Cut
Idle after fuel cut
0.5 V / Div
2 sec. / Div
DTC DETECTING CONDITION
POSSIBLE CAUSE
While vehicle running at constant speed under other
than high load.
Time from rich or lean switching command is output
till HO2S-2 output voltage crosses 0.45 V less than
specified value.
2 driving cycle detection logic, monitoring once / 1
driving.
Exhaust gas leak
Three way catalytic converter malfunction
Fuel system malfunction
HO2S-2 malfunction
HO2S-1 malfunction
Содержание GA413
Страница 1: ...99500 76A01 01E 99500 76A01 01E SERVICE MANUAL SERVISE MANUAL...
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Страница 267: ...SYSTEM CIRCUIT ANTILOCK BRAKE SYSTEM ABS OPTIONAL 5E 13...
Страница 277: ...ANTILOCK BRAKE SYSTEM ABS OPTIONAL 5E 23 Fig 1 Fig 2 Fig 3 Fig 5 Fig 4 1 ABS hydraulic unit control module connector...
Страница 414: ...6E 4 ENGINE AND EMISSION CONTROL SYSTEM...
Страница 418: ...6E 8 ENGINE AND EMISSION CONTROL SYSTEM ECM CONNECTORS TERMINAL ARRANGEMENT VIEWED FROM TERMINAL SIDE...
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Страница 441: ...ENGINE AND EMISSION CONTROL SYSTEM 6E 31 Fig for Step 2 Fig for Step 3...
Страница 443: ...ENGINE AND EMISSION CONTROL SYSTEM 6E 33 Fig for Step 2 Fig for Step 3...
Страница 446: ...6E 36 ENGINE AND EMISSION CONTROL SYSTEM Fig for Step 2...
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Страница 457: ...ENGINE AND EMISSION CONTROL SYSTEM 6E 47 Fig for Step 2 Fig for Step 3 Fig for Step 4 1 EVAP hose...
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Страница 600: ...BLANK DIFFERENTIAL 7F 17...
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Страница 672: ...9 36 BODY SERVICE...
Страница 674: ...9 38 BODY SERVICE...
Страница 675: ...BODY SERVICE 9 39 RUST PROOF TREATMENT AREA...
Страница 676: ...9 40 BODY SERVICE...
Страница 752: ...Prepared by Overseas Service Department 1st Ed February 1999 2nd Ed October 2001 Printed in Japan Printing 762...
Страница 753: ......
Страница 870: ...6 94 ENGINE GENERAL INFORMATION AND DIAGNOSIS GA413 supple Fig 1 for Step 2 Fig 2 for Step 3 Fig 3 for Step 4...
Страница 895: ...ENGINE AND EMISSION CONTROL SYSTEM 6E 3 GA413 supple...
Страница 896: ...6E 4 ENGINE AND EMISSION CONTROL SYSTEM GA413 supple...
Страница 902: ...6E 10 ENGINE AND EMISSION CONTROL SYSTEM GA413 supple...
Страница 991: ...9 4 BODY SERVICE GA413 supple...
Страница 993: ...9 6 BODY SERVICE GA413 supple...
Страница 994: ...BODY SERVICE 9 7 GA413 supple RUST PROOF TREATMENT AREA...
Страница 995: ...9 8 BODY SERVICE GA413 supple...
Страница 998: ...BODY SERVICE 9 11 GA413 supple UNDERBODY DIMENSIONS For van model...
Страница 1000: ...BODY SERVICE 9 13 GA413 supple For truck model...
Страница 1010: ...Prepared by Overseas Service Department 1st Ed October 2000 Printed in Japan Printing October 2000 262...
Страница 1130: ...7E 20 DIFFERENTIAL FRONT 09944 66020 Bearing installer 09951 16060 Lower arm bush remover...
Страница 1131: ...Prepared by Overseas Service Department 1st Ed March 2000 2nd Ed March 2001 Printed in Japan Printing April 2001 122...
Страница 1132: ...SUPPLEMENTARY SERVICE MANUAL FOR 4WD MODEL SUPPLEMENTARY SERVICE MANUAL 99501 76A01 01E 99501 76A01 01E I 20mm...
Страница 1141: ...Tables des mati res K Connecteur 8A 7 4 L Connecteur 8A 7 5 O Connecteur 8A 7 6 Q Connecteur 8A 7 6 Glossaire 8A 8 1...
Страница 1143: ...ndice MEMO Notizen Note Notas...
Страница 1159: ...8A 1 12 MEMO Notizen Note Notas...
Страница 1179: ...8A 3 20 Memo Notizen Note Notas...
Страница 1181: ...8A 4 2 Memo Notizen Note Notas...
Страница 1192: ...8A 6 5 Memo Notizen Note Notas...
Страница 1198: ...8A 6 11 Memo Notizen Note Notas...
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Страница 1216: ...8A 6 29 Memo Notizen Note Notas...
Страница 1226: ...8A 6 39 Memo Notizen Note Notas...
Страница 1237: ...8A 6 50 Memo Notizen Note Notas...
Страница 1246: ...Prepared by 1st Ed July 2002 Printed in Japan 114...