YH4
GRAND
VITARA
6-1-98
ENGINE (H25 ENGINE)
TERMINAL ARRANGEMENT OF ECM (PCM) COUPLER (VIEWED FROM HARNESS SIDE)
1. Warm up TWC converter (Bank 2)
2. Warm up TWC converter (Bank 1)
3. TWC converter
4. HO2S (Bank 2, Sensor 2)
5. HO2S (Bank 2, Sensor 1)
6. HO2S (Bank 1, Sensor 1)
7. HO2S (Bank 1, Sensor 2)
DTC P0420 CATALYST SYSTEM (BANK-1) EFFICIENCY BELOW THRESHOLD
DTC P0430 CATALYST SYSTEM (BANK-2) EFFICIENCY BELOW THRESHOLD
SYSTEM/ WIRING DIAGRAM
SYSTEM DESCRIPTION
Exhaust oxygen concentration at the upper part and the lower part of TWC is detected from HO2S-1 and HO2S-2
respectively and accordingly ECM (PCM) controls the closed loop which then controls the fuel injection volume.
While the above control is going on and if TWC is in good condition, the output voltage of HO2S-2 is maintained
at specified level. As TWC is in becomes deteriorated, even when the above control is going on, the exhaust gas
which has passed TWC then passes HO2S-2 at the exhaust oxygen concentration similar to that of the upper part
of TWC without being oxygenated or converted. Thus, waveforms of HO2S-1 and HO2S-2 output voltage become
alike. ECM (PCM) judges deterioration of TWC by comparing waveforms of HO2S-1 and HO2S-2.
Содержание 2000 Grand Vitara SQ416
Страница 75: ...ENGINE DIAGNOSIS G16 J20 ENGINES 6 71 Fig 1 for Step 3...
Страница 179: ...6 1 68 ENGINE H25 ENGINE a Fig for STEP 2 3 a HO2S heater relay...
Страница 190: ...ENGINE H25 ENGINE 6 1 79 a Fig for STEP 2 3 a HO2S heater relay...
Страница 205: ...6 1 94 ENGINE H25 ENGINE Fig for STEP 4 1 Disconnected CMP sensor coupler 2 BI B wire terminal 3 Gr Y wire terminal...
Страница 541: ...6E1 4 ENGINE AND EMISSION CONTROL SYSTEM G16 J20 ENGINES G16 ENGINE...
Страница 542: ...ENGINE AND EMISSION CONTROL SYSTEM G16 J20 ENGINES 6E1 5...
Страница 543: ...6E1 6 ENGINE AND EMISSION CONTROL SYSTEM G16 J20 ENGINES J20 ENGINE...
Страница 544: ...ENGINE AND EMISSION CONTROL SYSTEM G16 J20 ENGINES 6E1 7...
Страница 549: ...Or W Bl G Bl Y C51 1 22 C51 1 23 C51 1 10 C51 1 11 6E1 12 ENGINE AND EMISSION CONTROL SYSTEM G16 J20 ENGINES...
Страница 552: ...ENGINE AND EMISSION CONTROL SYSTEM G16 J20 ENGINES 6E1 15...
Страница 592: ...6E2 4 ENGINE AND EMISSION CONTROL SYSTEM H25 ENGINE...
Страница 593: ...ENGINE AND EMISSION CONTROL SYSTEM H25 ENGINE 6E2 5...
Страница 597: ...ENGINE AND EMISSION CONTROL SYSTEM H25 ENGINE 6E2 9...
Страница 661: ...IGNITION SYSTEM FOR J20 H25 ENGINES 6F2 13 INSTALLATION For installation reverse removal procedure...
Страница 723: ...6H 30 CHARGING SYSTEM 17 Make sure that rotor turns smoothly...
Страница 729: ...Prepared by Overseas Service Department 1st Ed April 2000 Printed in Japan Printing April 2000 736...