Hello everyone,

I'm new on this forum. My name is Auke and I own a Honda del sol from 1992 with a d15b7 engine and a d16z6 head with a chipped p29 ecu with vtec.
The problem is that its been throwing a code 41 which indicates that there is a problem with the o2 sensor heater control. I've checked continuety of all the wires and that's all good.
The problems seems to be pin A6, which is a ground for the heater in the sensor. the problem with the pin is that it is indeed a ground when the ignition is not turned on, but when I switch the ignition to "on" the pin switches polarity and becomes positive. I've also had the same problem with a positive ignition wire from my fuel pump relay, it was supposed to be positive but the wire switched to ground when ignition was turned "on". At that point I just added a new wire from the ignition to the relay and thus the problem was solved, no errors nothing.



I have a 4 wire brand new o2 at the moment.
Problem in short: A6 switches polarity to positive and thus the heater element gets 2 times positive.
Question: Does anybody have an idea about the cause of the switched polarity of originally the fuel pump and now pin A6 from the heater control on the ecu?

Any help would be appreciated!!
Sorry if my English is incorrect or not complete



Greetings,

Auke