Sienna Toyota Camry XV20

Sienna

1. Three heated oxygen sensors are used, one on each exhaust manifold, and one on exhaust pipe, behind catalytic converter. Heated oxygen sensor on rear (firewall side) exhaust manifold may be referred to as bank No. 1 sensor No. 1. Heated oxygen sensor on front (radiator side) exhaust manifold may be referred to as bank No. 2 sensor No. 1. Heated oxygen sensor on exhaust pipe behind catalytic converter may be referred to as bank No. 1 sensor No. 2.
2. To test the heater on the heated oxygen sensor, disconnect electrical connector from appropriate heated oxygen sensor and note heated oxygen sensor terminals. (Scheme 280)and (Scheme 281). NOTE: Electrical connector for heated oxygen sensor on exhaust pipe behind catalytic converter is located below passenger's side front seat, underneath the carpet and contains a Dark Gray 4-pin electrical connector.
3. Using ohmmeter, check resistance between +B and HT terminals on electrical connector. (Scheme 280)and (Scheme 281). Replace heated oxygen sensor if resistance is not 11-16 ohms at 68°F (20°C).
4. If problem exists in heated oxygen sensor, heater or wiring circuit, a Diagnostic Trouble Code (DTC) may be stored in the Engine Control Module (ECM). For diagnosis of DTC, see appropriate TESTS W/CODES article.

Scheme 280

Scheme 281

1. Two heated oxygen sensors are used, one on exhaust pipe in front of catalytic converter, and one on exhaust pipe behind catalytic converter. Heated oxygen sensor on exhaust pipe in front of catalytic converter may be referred to as bank No. 1 sensor No. 1. Heated oxygen sensor exhaust pipe behind catalytic converter may be referred to as bank No. 1 sensor No. 2.
2. To test the heater on the heated oxygen sensor, disconnect electrical connector from appropriate heated oxygen sensor and note heated oxygen sensor terminals. (Scheme 282)
3. Using ohmmeter, check resistance between +B and HT terminals on electrical connector. (Scheme 282) Replace heated oxygen sensor if resistance is not within specification. See «OXYGEN SENSOR HEATER RESISTANCE»(ref-95583-S22431172102001040200000) table.
4. If problem exists in heated oxygen sensor, heater or wiring circuit, a Diagnostic Trouble Code (DTC) may be stored in the Engine Control Module (ECM). For diagnosis of DTC, see appropriate TESTS W/CODES article.

OXYGEN SENSOR HEATER RESISTANCE

Scheme 282