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10-16-2012, 11:38 AM | #1 | |
AF Newbie
Join Date: Oct 2012
Location: brenton, West Virginia
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2000 avalon heated oxygen sensor
Check engine light came on plugged my obd2 in and got p1135 and p1155. according to manual its bank one sensor one and bank 2 sensor 2 heater circuits. bank one sensor is reading right but i cant read back to ground on my plug that i plug the o2 sensor into where does the ground wire go to please help.
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11-20-2012, 06:34 PM | #2 | |
Resident Chemist
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Re: 2000 avalon heated oxygen sensor
My information is that DTC P1155 relates to Bank 2 Sensor 1, not Bank 2 Sensor 2. Please double check your information.
Ground wire for Bank 1 Sensor 1 and Bank 2 Sensor 1 heater circuits go to connector E5 pins 3 and 4 on the ECM. I don't believe you have a Bank 2 Sensor 2 in your vehicle. Both sensors you have to check are in front of the cat convertor. Your Sensor 1 sensors are both A/F ratio sensors. The sensor behind the cat convertor is Bank 1 Sensor 2 and is an HO2 sensor. With ignition on, check voltage to ground of terminals HAFL and HAFR on ECM. (Top middle pair in second connector from left) Should be 9-14 V. Check resistance of A/F sensor heater (a) Disconnect the A/F sensor connector. (b) Using an ohmmeter measure the resistance between terminals +B and HT (two connectors furthest from the two ridge side of the connector). Resistance: At 20°C (68°F) 0.8 - 1.4 ohms At 800°C (1,472°F) 1.8 - 3.2 ohms If the resistance is not as specified, replace the sensor. Torque: 44 N·m (450 kgf·cm, 32 ft·lbf) (c) Reconnect the A/F sensor connector. Check A/F sensor heater relay (Marking: A/F HTR in relay box next to battery). 1. REMOVE RELAY BOX COVER 2. REMOVE A/F SENSOR HEATER RELAY 3. INSPECT A/F SENSOR HEATER RELAY CONTINUITY (a) Using an ohmmeter, check that there is continuity between terminals 1 and 2 (Two terminals parallel to long side of relay). If there is no continuity, replace the relay. (b) Check that there is no continuity between terminals 3 and 5 (Two terminals parallel to short side of relay) when no voltage is applied across 1 and 2. If there is continuity, replace the relay. 4. INSPECT A/F SENSOR HEATER RELAY OPERATION (a) Apply battery voltage across terminals 1 and 2. (b) Using an ohmmeter, check that there is continuity between terminals 3 and 5 at this time. If there is no continuity, replace the relay. I have a Toyota FSM if you need to download one.
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate" Last edited by Brian R.; 11-20-2012 at 07:14 PM. |
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