I have an 98 toy Tacoma 2.7 and need to test for voltage to my o2 sensors, specifically the forward/sensor 1. We took it to a dealer and they said I have a short.
JA: Sometimes things that you think will be really complicated end up being easy to fix with a Toyota. The Toyota Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: Our catalytic converter
was stolen some years ago but has since been replaced, however we keep getting P0130 and P0135 codes. We have replaced both sensors. Still get the codes a DAY OR TWO AFTER RESETTING THE check engine
light. I have a schematic of the ECM and o2 sensors but need to check for a short in the harness.
JA: Are you hoping to fix this yourself?
Customer: Yes but I don't know which pins on the electrical connector to check for voltage.
JA: Great! What have you tried so far?
Customer: I have taken the glove box out and have check continuity to the sensors which seems to be good from the ECM to the sensors. Ground is good to sensors. The only wire I haven't checked (white w/ red stripe) goes from sensor to Junction block 3 under the dashboard.
JA: Is there anything else the Toyota Mechanic should be aware of about your Toyota?
Customer: The test the dealer preformed confirmed that there is voltage to one sensor but not to the other. ECM voltage is good, ohms of both sensors is good.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Toyota Mechanic about your situation and then connect you two.