Sensor Heater Circuit Malfunction (P0135) Toyota Solara?

matt h

So I have a 2001 Toyota Solara. I replaced the O2 sensor recently (bank 1, sensor 1). I reset the codes, and it's still saying "P0135, Sensor Heater Circuit Malfunction". The common answer to this is always "Replace the O2 sensor". Well I have, but it's still here. Has anyone ever dealt with this, and knows what's going on?















Thanks in advance!

Ridds

Possible causes:































HO2S no. 1 heater circut is open or shorted















HO2S no. 1 is defective















Defective ECM































Using a scan tool, read freeze frame data. Freeze fram data records engine conditions when a malfunction is detected.































Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector. If DTC P0135 is set, measure voltage between ground and terminal No. 3 (Blue/Black wire) at ECM harness connector E10. If DTC P0155 is set, measure voltage between ground and terminal No. 4 (Yellow/Red wire) at ECM harness E10. Voltage should be 9-14 volts at each terminal. If voltage is as specified, replace ECM.































If not, Disconnect suspect HO2S No. 1 harness connector. Measure resistance between terminals B+ (Black/Yellow wire) and HT (Blue/Black wire on bank No. 1 ; Yellow/Red wire on bank No. 2) at HO2S connector (component side). Resistance should be 11-16 ohms at 68 degrees F and 23-32 ohms at 1472 degrees F. If resistance are not specified, replace appropriate HO2S. If resistance are specified, Repair wiring between ECM and appropriate HO2S, or between appropriate HO2S and EFI main relay (Black/Yellow wire at HO2S and Red wire at EFI main relay)































You will need wiring diagrams.































Hope this helps.