ein020

Just completed my first b series swap into my EK9 and had an odd wiring question.
The secondary O2 sensor is reading a fault with the heater circuit and when I chased the wire back between the sensor and the ECU and the ground/power wire. Anyone ever chase this? The wire appears to be broken but the Haynes manual's diagrams aren't the best. I'm not sure if it's broken or if I can't get a good reading. Anyone have any thoughts?

ein020

Morning Bump

EE_Chris

Get under your car, disconnect the 2nd O2 sensor from the main engine harness and measure the heater resistance: 15-40 ohms is spec.

You'll want to get a Helms manual...it's what the factory uses.

ein020

I the sensor is good. I cannot get a signal between the ECU plug and the plug that the O2 sensor plugs into. The harness diagram isn't too clear on wether anything else is connected to the two wires elsewhere in the harness such as a common 12v supply or ground not really sure which at this point. It's been a while since I toyed with it. To me it seems like a break but could there be a way I'm getting a false reading that looks like a break.

EE_Chris

Do you really have an EK9? Or a USDM 6th gen hatchback (EJ6)?

ein020

After looking it up apparently it is an EJ6 but I'm not sure what the chassis code has to do with an electrical question. The car is a USDM DX 1999 hatchback with an OBD2B harness originally and I adapted it for a B18 OBD2B ecu. I hope this info helps.

ein020

Day off bump